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Home-Made Bob Beck Magnetic Pulser (Thumper)
Based on the Design by Chris Gupta
If you made it to this web page, you most likely have already been researching the Bob Beck Protocol. If you have no knowledge of electronics and are wanting to build your own pulser, I recommend thoroughly going over Chris Gupta's Pulser page first and then coming back here to fill in the blanks. Here I offer photographs and additional information that may be of assistance to anyone wanting to build their own Bob Beck Electromagnetic Pulser.
Bob Beck Protocol Information: If you would like to learn more about Robert Beck and the Beck Protocol, you can view several Google Videos by clicking on the following Link - Beck Video. Beyond these videos, there is a wealth of information on the internet about the Bob Beck Protocol. In a nutshell however it implies a four process system involving blood electrification, electromagnetic pulse, colloidal silver and ozonated water. If you are experiencing cancer, HIV, lupus, candida or one or more of a host of other ailments, it would be worth your time to research this health process. Also, you can download the accompanying manual that was handed out to participants of the Bob Beck Lecture ("Take Back Your Power" (1MB PDF). I have searched high and low for this and finally found the complete document.
Useful mag pulser technical information provided by Russ Torlage of Sota Instruments regarding the construction of electromagnetic pulsers can be found by clicking on this link.
The information I provide on this web page is an account of what I have learned in the process of studying Beck devices and building my own units for my own experimentation purposes. I assume no responsibility for anything one might do with the information provided on this web page. Please view any explanations as hypothetical and not as instructions to be followed.
Lethal Electric Shock Hazard!
This device uses 110V AC current and a powerful capacitor that charges up to 360V. If this device is not built in a safe manor, there can be a risk of lethal electric shock. It would advisable for individuals that are unfamiliar with electronics, to have someone like a TV repairman build this device for them. PLEASE PLEASE PLEASE be absolutely present, mindful and cautious when working around exposed capacitors. As you will read below, even a shock by a single capacitor from a disposable camera, can be extremely unpleasant. A professor at Pen Engineering jokingly recommended that I keep one hand in my pocket. In other words, keeping one hand in my pocket would prevent an electric shock from traveling across my heart!
Looking on the bright side however, Chris Gupta told me that many people have successfully built and are using this device based on his schematic. I'm just asking those that are intending to build this machine, to use safe practices when working around exposed capacitors and hot electrical wires.
Please post any successes, failures, comments or questions on Chris Gupta's Pulser web page, or on my FaceBook Page
Please take a close look at the all of the photos and images below before reading on. As I don't provide a lead-in, reviewing the images will help you to understand what I'm talking about.
All measurements are in Inches.
Plastic Box Outside Dimensions:
approximately 2-3/8 X 4-1/4 X 7-3/8
Using 1/2 inch #4 beveled machine screws I fastened a 1/8 inch plexiglas sub-floor to the bottom of the box in order to allow for the attachment of the Terminal Contact Bars and the home-made bracket for the SCR. The sub-floor also provides an insulated suface for the circuit components to be mounted to. Screws were counter sunk into the outside-bottom of the plastic box and fastened on the inside with a lock washers and nuts. After all components were soldered and attached to the sub-floor, the sub-floor was then fastened to the ends of the four screws coming up from the bottom of the box and again fastened with nuts and lock washers.
Looking at Chris Gupta's Mag Pulser circuit, Gupta has the on/off switch on the negative or netral side circuit. It should be switching the hot lead not the neutral lead! First the On/Off switch and then the bulbs are on the positive side of the circuit. In electrical circuits, generally it is always the hot lead (+) that is switched.
Implementing a Strain Relief:
Strain reliefs are essential for electrical safety. They prevent cables from being ripped out of a circuit in the event an electrical device gets dropped or e.g., should someone trip over an electrical chord.
The SCR (Silicon Controlled Rectifier) and has three contacts.
SCR Update November 2016: I have now switched to a new surface mount SCR that is more robust than the Phillips ECG 5529 post mount SCR I was using. The new SCR is the LittleFuse SK065KTP. The LittleFuse SK065KTP SCR is rated for 1000V, has a 41A continuous and an 950A peak amperage rating, which exceeds Gupta's design specs. At least in my searching on the web, I found that S602L that Gupta lists on his schematic actually is not in compliance with his own specifications for that component, as it only has a "Peak Amp" rating of 255A. Gupta told me that component specs vary depending the on manufacturer that makes it. He also told me that a heat sink for the SCR was not necessary. I had already ordered it however, so I went ahead and installed it anyway. New photos of my upgraded EMP based on Chris Gupta's design can be found at the bottom of this page.
Note: The trigger gate on this SCR is 50mA and may not be suitable as is, for use with Gupta's auto-pulsing circuit without installing an additional triggering circuit. This is because the neon bulb can transmit enough current to trigger the SCR. It's not an issue with the SCR that Gupta recommends, however as I stated above, it is underpowered for this circuit.
Specifications are as follows:
LittleFuse SK065KTP SCR
This SCR needs to be mounted on a heat sink to prevent the component from overheating. Both items can be purchased from Newark element 14. Newark part numbers are as follows.
LittleFuse S4065JTP Thyristor/SCR - Newark Stock Number #99K0083 - Web Page
AAVID Thermalloy 6396BG Heat Sink - Newark Stock Number #6396BG - Web Page
Bulbs and Lamp Holders : I used candelabra lamp holders as they take up less space and are less bulky. Holes of the appropriate size were drilled into the top of the box about 1 inch in from the edges. The main thing here, is to make sure that the bulbs are not touching when screwed into the sockets. My pulser makes use of two spherical shaped 60W bulbs. The spherical bulbs were more aesthetically pleasing to me than traditional candelabra bulbs. Should a bulb burn out, replace it before continued use. In Chris Gupta's design the bulbs act as current limiters and protect the SCR from short-circuiting.
Note: Keep in mind that the bulbs do get hot if you are using the pulser for several minutes at a time.
Inductor Coil: If you want to go the easy way like me, and don't want to go through the hassle of winding your own coil, you can purchase a beautiful "perfect lay" 2.5mH inductor coil wound with 16 AWG magnet wire from Erse Audio ($14) Part #EAC35-16-2500
Note 1: The AMS coil that is listed in numerous Beck texts
as an alternative to building your own, is no longer manufactured.
Connecting the Inductor Coil: The inductor coil attaches to the Cathode of the SCR and to the negative 'Contact Bar' of the capacitor bank.
Connecting the Push To Make" Switch: The "push-to-make" switch attaches to the gate of the SCR and to the 10K resistor. The other end of the 10K resistor attaches to the positive (+) side of the circuit, after the voltage doubler. The voltage doubler is comprised of the capacitor just past the bulbs and the two diodes and converts the 120V house voltage to 260V! I have now switched to 1000V, 10 amp diodes for this location. 1000V diodes are cheap and they add an additional safety measure to protect from unforeseen voltage spikes.
Photo Flash Capacitors: The ability of a capacitor to store a charge is measured in 'Farads'. Most capacitors are labeled in Micro Farads (uF). The photo-flash capacitors you see in the tray below, all came from one run to a local drug store that does photo processing. They are all from an assortment of disposable flash cameras and range from 80uF - 160uF.
On this occasion I hit the jackpot as the camera recycle
bin was full. I could have selected twice as many. Different camera
manufactures and even cameras from the same company will often have
caps of different ratings, ranging anywhere from 330V 80uF - 330V 160uF,
and on occasion even higher. Larger capacitors with higher voltage
and uF ratings can store more energy. When hooked up in parallel the
uF ratings are cumulative. Two capacitors rated at 330V 80uF hooked
up in parallel, will have a combined rating of 330V 160uF. When
hooked up in series, it is the voltage rating that increases. The same
two capacitors hooked up in series would have a combined rating of
660V 40uF. Note how the capacitance changes with capacitors hooked together in series. Below is a simple formula to calculate the capacitance of capacitors hooked up in series.
New PhotoFlash capacitors are readily available from eBay in different capacitance values and voltages. Personally I would look to eBay and buy a new capacitor. Try to avoid NOS (New Old Stock) capacitors as they can degrade over time. Look for a 450V, 600uF-800uF photoflash capacitor.
The formula to calculate the combined capacitance of capacitors hooked up in series is as follows:
Consider that we are hooking four 80uF capcitors together in series.
1/80 + 1/80 + 1/80 + 1/80 = 0.05
Total capacitance of the four 80uf capacitors hooked together in series = 1 / 0.05 = 20 MFD
SOMTHING TO THINK ABOUT: Russ Torladge of Sota Instruments claims that having a capacitor with a higher uF rating will not increase the intensity of the magnetic pulse, but rather increases the pulse duration. So perhaps it is better to stick with a single photo flash capacitor in the 600 - 700 uF range. Torladge uses a single 600uF photoflash capacitor in his mag pulser device.
Chris Gupta offers the following general rule of thumb about capacitors hooked together in a parallel configuration: The voltage flowing through a set of capacitors in parallel, should not exceed the voltage of the lowest rated capacitor. For example if you connect a 330V 80uF capacitor and a 150V 80uF capacitor together in parallel, the combined voltage rating of the two will be 150V.
Capacitor Ratings From Various Cameras I Have
Kodak Power Flash: 120uF & 160uF (two slightly different models)
Kodak Zoom: 100uF & 120uF
Kodak FunSaver: 120uF
Polaroid Fun Shooter: 80uF
Studio 35: 80uF
In regard to capacitor (bank) C2, it will be difficult to find130uF capacitors from disposable cameras. The highest rated capacitor I have been able to find from a disposable camera is 160uF and out of over 100 cameras I have taken apart, I have found only one with such a rating. Most photo-flash caps you will get out of a camera are between 80uF and 120uF. Keep in mind however, one can mix and match capacitors in parallel to arrive at the desired microfarad rating.
Click here for more information on capacitor charge calculations.
Observing Chris Gupta's circuit design, you see that his schematic calls for one 150V 130uF capacitor for capacitor C1. According to Gupta, it is OK to use photflash capacitors in this location, so the easiest thing to do in this situation, is to use two 330V 80uF photoflash capacitors hooked together in parallel for capacitor C1 to provide a combined capacitance of 160uF. Likewise for the capacitor array C2; if all one had was 80uF caps to build a pulser with, one would want to add capacitors to the array in parallel in order to reach the 650 combined uF (micro farads) called for in Chris Gupta's design. In this case one might consider using 8 - 9, 80uF capacitors in parallel providing a combined rating of 640uF and 720uF respectively. That is why the higher the uF rating of the photoflash capacitor, the fewer capacitors one will have to use in the capacitor bank C2.
The negative terminal of electrolytic capacitors is marked by a stripe running down the side. Two 5-contact, Terminal Contact Bars were used to solder the photo flash capacitors to. As the capacitors need to be connected in parallel, each Terminal Contact Bar has a piece of 14 gage copper wire soldered at each contact across the span of the bar to unify all contacts. The Negative pole of each capacitor is soldered to one contact of the terminal contact bar and the same for the positive side of the capacitors. Be sure the screw mounts are facing toward the outside. Once the capacitors were soldered in place, I marked the hole locations on the Plexiglas sub-floor and drilled the holes. The assembly was then fastened to the sub floor with 1/2 inch #4 Phillips machine screws, lock washers and nuts. See images below.
In order to avoid this whole mess of stringing capacitors together in parallel, have now switched to using a single 1000MFD 330V Rubicon Photo-Flash capacitor for C2. Also in compliance with Russ Torladge's (Sota Instruments) suggestion I added a high voltage silicon rectifier across the terminals of the capacitor. Specifics and the reason for this is explained in more detail below.
June 2016 Update. I noticed that the voltage in my version of Gupta's mag pulser circuit goes as high as 400V. This is significantly higher than standard 330V photo flash capacitors are rated for. Consequently I decided it would be safer to increase the voltage capacity of the main (pulse) capacitor. I now use a single, readily available Glan 450V 900MFD photo flash capacitor. The capacitor is about 3 inches long and about 1.5 inches in diameter, so plan for that size when designing your build.
Most often capacitors in spent disposable cameras will still have a charge and can shock you if touched. If you attempt to build your own pulser, please be sure to always discharge capacitors before removing them from a camera.
SHOCK HAZARD: If you disassemble a camera, be extremely careful when removing the cover and handling components. Avoid touching any of the circuitry until the capacitor has been discharged. I recently got shocked from a camera that had a 330V 80uF capacitor inside, and it really hurt! The jolt went up my whole right arm and it took about a half an hour for my hand and arm to feel normal again. Capacitors are not to be taken lightly and should be considered dangerous and potentially life-threatening!
During testing, when I discharged the capacitor array, it sounded like a firecracker going off in my ear and the tips of the 14 gage wire were slightly melted. There was a noticeable difference in the discharge strength of seven capacitors as compared to five. One does not want to get shocked by that! A jolt like that going across one's heart could be lethal! - Please be careful and always discharge capacitors, even if you think they are not charged. Instructions to build a capacitor discharge tool that will safely discharge a bank of capacitors is outlined above.
Making a Capacitor Discharge Tool: One can make a capacitor discharge tool with two insulated alligator clips, about 16 inches of 14 gage stranded wire and a 10,000 ohm, wire-wound, 10 Watt resistor. Solder an insulated alligator clip to either end of the insulated wire. Then cut the wire about 7 inches from one end, and solder the resistor in place. Now wrap the resistor and solder points with at least three layers of ELECTRICAL TAPE.
Discharging Capacitors: Carefully connect the alligator clips to the capacitor terminals (one clip to each exposed terminal). The resistor will drop the voltage down in a minute or so.
Diodes are also directional and must be installed properly. Their primary function is to insure the flow of current is only in one direction. This symbol is used to indicate a diode in a circuit diagram. Current flows from the cathode side to the anode side. If they are installed with the polarity reversed, your pulser will not work. The stripe on any diode indicates the cathode side and the negative pole.
About flying fender washers: My washers don't fly up from the center of the coil as with some other designs. Washers on my unit fly in line with the sides of the coil. When experimenting with this, one needs to play around with the magnetic field until one finds the right spot. Once I figured out the correct positioning for the washer, I was able to get a 1-1/2 inch fender washer to soar about 40 inches into the air. Pretty amazing!
Starting my Pulser for the First Time: I didn't know what to expect when I plugged the chord into the outlet and pressed the on switch for the first time. The lights came on momentarily and then went out. Chris Gupta told me this was normal.
Should you build your own machine based on this design, and after turning the unit on, the lights come on and stay on, immediately turn the machine off and troubleshoot your assembly! Also if the lights don't come on at all, then something is amiss as well. I had rubber gloves on when I pressed the push-to-make switch for the first time. When pressing the push-to-make switch the lights shown brightly and I could hear a slight momentary sound from the wires in the coil. Again, Chris said this was normal. All was well and I had successfully built my pulser. After repeated pulses, the coil will begin to get warm. This too is normal.
Note: Always press and instantly release the push-to-make switch. The circuit is designed for repeated but momentary bursts of electromagnetic pulses. Keeping the push-to-make switch depressed will damage your pulser.
One should consider saturating the induction coil with some kind of resin and let it cure, to prevent the wires inside the coil from moving when the machine is discharged. The movement of wires inside the coil is in effect wasting energy that could be converted into electromagnetic energy. Also, such movement over time can cause the insulation of the magnet wire to wear through, and cause the coil to short out internally. I purchased a large bottle of super glue available at most hobby stores and poured a substantial amount into the coil. I then sprayed a little super glue catalyst onto the coil that made the glue cure instantly on the surface. The catalyst is also available at the same hobby shop where the glue is purchased. The catalyst is very handy to speed up the curing process. I still let the coil sit over night before using it, to make sure all of the glue had cured on the inside. Be careful when doing this, because super glue will instantly bond skin. Also one also doesn't want to inadvertently glue the coil to whatever it is sitting on. Use acetone for cleanup
Chris Gupta's Instructions and parts List:
Well finally, I have got all the wrinkles out my prototype SCR Thumpy. And this circuit has definitely got the power. You can actually feel an electric current pulse when used in the neck area - uncanny! This is subtle however. I hasten to add that power is not the be all and end all, indeed, it is quite possible to design very effective low power pulsers with exceptionally fast pulse rise times that can surpass the performance of even the most powerful pulser. Unlike the high power pulsers these minimize dangers from electromagnetic radiation. So be warned and don't get carried away with the lure of high power! It has been long known amongst alternate energy and electromedicine researchers that very high speed pulses have the ability to tap into some form of radiant energy that is generally not recognized by mainstream science. Devices with very weak but high speed pulses in nanosecond range have been build and efficaciously used by NASA engineers. This is a well known phenomena and I have worked it out mathematically to my satisfaction. More on this at a later date. One theory is that such weak high speed pulses are able to by pass the cell electromagnetic defences by their sheer speed but certainly there are other issues a play such as tapping radiant energy... For a better description on this please see Dr. Glen Gordon's video here. Dr. Gordon was a candidate for a heart transplant but managed to rebuild his own heart by just such a device.
See also: BIOELECTROMAGNETIC MEDICINE - THE BOOK
Please note that this is not a permanent magnet but a pulsed magnet and as such the polarity is not an issue, when the pulse collapses the magnetic field reverses. Hence one need not worry about the magnetic polarity.
I still don't like the auto types as the body gets habituated to non random pulses the only exceptions are possilbly the natural beat frequency of the Earth magnetic field (9.6 Hz) AND the Schumann waves (7.83 Hz) - a random pulser circuit is still the goal but due to great demand, much against my will, have now included a constant pulsing option for those who requested it. For the sake of simplicity a neon lamp is used. Unfortunately neons are not very stable and tend to vary as time goes by and may need to be replaced so use a socket for a quick change. The pulsing rate can be changed and should be changed every so often so the body does not get habituated, to that end I have added a switch to change the pulse rates...
To calculate the output energy use the following:
W=energy in joules: C = Capacitance in farads: E = Voltage across Capacitor in volts
# capacitors #Joules
More on Capacitor Charge Calculatio re.
Any SCR with PEAK current of at least 600 to 1000 amps should work. The one shown is 20 amp continuous with the appropriate peak rating. The lamps act as current limiters and protect the SCR against a short circuit. The circuit can be further simplified as discussed in point 3 below.
I have build several of these and my experience has been:
1) The capacitors develop a memory and don't fully discharge its better to use a number of them in parallel. This reduces the internal resistance and provides a better result and less memory loss. The caps must be designed for flash applications. They need not all be the same value but must be the minimum voltage rating stated.
2) In the original Beck based designs the flash tube heats and develops some resistance so you need to have enough time between flashes for them to cool down. This has been eliminated in my circuit, however, you still need some time for the capacitors to charge up. The larger the capacitor bank the longer it will take to charge up. Those planning to incorporate the automatic version must be mindful of this and adjust the timer circuit to compensate this effect.
3) Using a high current SCR (forces the caps to fully discharge by providing a longer connection than the strobe) and parallel caps from disposable cameras I can now consistently get 12 - 18 inch jumps with #14 fender washers. You can cycle them very fast (though not recommended). All for less than $30 to $50 Cdn. The most expensive part is the coil which can cost as much a $20 unless you build it yourself! One can further reduce the cost if at a latter date you don't want to upgrade to auto pulsing. This can be accomplished by removing the 10k resistor and the SCR and by simply wiring the a push to close switch in line to the coil. Don't recommend this unless you just can't get an SCR or really need to reduce cost. MAKE SURE THE PUSH BUTTON SWITCH CAN HANDLE THE CURRENT AND IS MECHANICALLY ROBUST!
More info regarding other coils options etc. is available at:
Coil winding instructions from Dr. Beck's paper are:
"Junk VHS videocassette reels are cheap, plentiful and adequate for this application. Remove 5 screws from shell, remove reels and discard tape. Be SURE alternative spools (if used) are non-conductive or system will not work. Avoid shorter length VHS tape reels which may have center hubs larger than 1" dia. and won't hold sufficient wire. Drill 1/4" holes through hub and through center of flange(s). Make two 4" discs from 1/4" thick plastic or fiberboard, drill 1/4" center holes and another 1/4" hole off-center so coil's inside lead wire can be pulled through. These 'stiffeners' will sandwich reel's flanges so they won't warp or split as wire pressure builds up while winding progresses. A 2" (or longer) 1/4-20 machine nut and bolt with washers through centers will clamp flange stiffeners and reel and also provide a shaft to hold in a variable speed drill motor or similar winding device if used. Then remove bolt and stiffeners.
Specifications: Completely fill tape spool with #14 or 16 enameled copper magnet wire (130 to 160 turns) wound onto the 1" dia. hub and 3-1/2" OD spool with a gap width for wire of 5/8". Scrape enamel insulation 1/2" from ends and tin. Pull inside end of magnet wire through hub and stiffener and to outside. ~130 turns (about About 1-1/2 lbs should fill spool. Remove bolt, stiffeners, and finished coil. Now solder ends of 3 ft of heavy two-wire extension cord to each side of coil. Finished coil weighs ~1 LB 3 oz, has ~0.935 millihenry inductance, 0.34 ohm resistance, and takes ~20 minutes to hand wind or ~3 minutes with drill motor. An excellent alternative is an AMS brand air-core crossover inductor for home audio, #16 gauge, 2.5mH, 2-1/2" dia., $17.90 from Madisound speaker components.
Chris Gupta's EM Pulser Circuit
Those interested in using a 12 V DC source use a cheap 75 watt car inverter I bought one on sale for just $7 Cdn! Simply remove one of the bulbs. This of course is easier if at least one bulb is in a socket.
Steffan's 220V Recommendations
Not for US Style 220V where 110V + 110V = 220V)
Voltage source must provide a single120V Posotive connection and a single Neutral or "Return" connection.
Gupta's 220V circuit is flawed in that it only charges the capacitor to 220V. So that the 220V modification would still work with his design, he has removed the voltage doubler from the circuit be removing a capacitor and one diode. According to Russ Torlage of Sota Instruments, a minimum of 330V is required to generate a 6000 gauss magnetic pulse. Torlage also indicated that a 6000 gauss pulse was the minimum necessary to create the subcutaneous micro-currents needed to kill pathogens. In this regard the 110V machine is superior because it makes use of a voltage doubler. Once the 120VAC has in essence been rectified, the voltage is closer to 180V. As that voltage gets doubled in the circuit, it can reach a potential in the capacitor of 360V.
My Recommendation: When building the 220V mag pulser, use the 220V bulbs as Gupta recommended, but otherwise follow the wiring diagram in figure 1.
The voltage doubler needs to be in place. To install follow steps 1 and 2.
1.) Capacitor C1 needs to be in place and be rated 330V @ 150-160 MFD (Refer to figure 1). A 330V/160MFD photo flash capacitor would work well in this location. Search ebay.
2.) The value of the 2 diodes should be increased to 600V 10 amp (Refer to figure 1) for placement.
3.) For C2 use 1 Glan 900 MFD 450V photo flash capacitor (3" X 1.5"). Can be found on eBay. (Refer to figure 1).
4.) Increase value of SCR to 1000V.
5.) 10k resistor should be increased to handle the higher voltage. I would start with a 20k resistor and see if the there is enough current to trigger the gate on the SCR. If no, then drop down to 15k.
Capacitors can now charge to over 400V and the electromagnetic pulse will be substantially more powerful. The longer one lets the capacitor charge, the higher the voltage and the stronger the pulse. The voltage charge in the capacitor will of coarse reach its maximum at around 440V or slightly less.
This modification will only work with with Gupta's "MANNUAL", push button mag pulser design. I have not worked with Gupta's auto pulsing circuit, so I can't be of any assistance there.
Most Current Magnetic Pulser Info and Photos
Based on Chris Gupta's 110V Mag Pulser Design
This is a pretty powerful EMP device! I did notice recently that this big 900 MFD capacitor takes a full six to 7 seconds to charge.
"When the capacitor gets fully charged, we must dump this high energy into the coil somehow. Originally a Xenon photoflash tube was used as a thyratron switch (the Xenon gas is ignited to a plasma which provides a low impedance path for the electron flow) for the do-it-yourself'ers. The Xenon tube presents about 1-3 ohms of resistance when ionized. It makes a good switch, but it does restrict peak current flow. Ringing can and does occur with the capacitor-coil combination because the current can back-feed into the capacitor. (This ringing affect can allow reverse-biasing of the main capacitor; degrading it's life-span very quickly or destroying the capacitor under extreme conditions.) When a capacitor is in series with an inductor in this manner, it is known as an L-C (Inductive from the coil and Capacitive from the capacitor) circuit.
Xenon tubes get hot, and they waste energy in the form of heat and (of course) light. A better switch is an SCR (Silicon Controlled Rectifier) of appropriate voltage and current rating (800-1000 Volts @ 25 Amps is a good start.). An SCR provides a one-way path of current flow from capacitor to coil, inherently preventing ringing and therefore saving the capacitor from reverse-biasing. This one-way path ensures the output magnetic field is DC based or uni-polar. This means North magnetic pole will always be on one side of the coil, and will not change to South pole at any time.
NOTE: Although a typical SCR is a fast operating device, there will always be a "dead-time" where the device is in a conductive state (known as tq which is typically = 35uS). This can allow reverse voltages to appear across the main capacitor which may eventually lead to a much shortened lifetime or the complete destruction of the capacitor. So, in order to prevent such an event we need to suppress this high-power content reverse voltage spike across the main capacitor. The simplest, effective and most economical way is to place a high-current diode in reverse, across the leads of the main capacitor. The CATHODE (-) lead of the diode connects to the POSITIVE (+) terminal of the capacitor. Remember, this reverse-voltage spike can contain many joules so you must use an adequately rated diode. We use an MR756 silicon rectifier. It is rated at 600 Volts DC, 6 Amps continuous and 400 Amps peak surge. I measured over 80 Amps of current in the reverse-voltage spike. WARNING: If you do not use a similar rated diode, it may very well blow up in your face! I know, because I had this happen many times while taking measurements. Scares the heck out of you!"
March 28, 2015
Please post any successes, failures, comments
or questions on on my FaceBook Page.
Some individuals have posted claims that Chris' design is flawed. I for one, can attest that his design is sound and works well. If after constructing your device it fails to work, it is most certainly an error in construction. If your device does not work, the capacitor polarity may be incorrect, one or more diodes may have incorrect polarity, a component may be burned out or defective, or there is an error somewhere in how things were assembled and soldered. Watch for any arching on your component board.
Update MAR 23, 2016 — My bulbless, auto-pulsing Bob Beck mag pulser is here!
Price $499. For more information and to purchase this device please click on This Link.
Page Last Updated November 5th, 2016