Anwar's observations below support the knowledge that the 'overvoltage impulse' measured across the battery is the result of a very brief pulse of heavy...
I was surprised how expensive TO220 resistors seem to be (more costly than TO220 transistors), but they would make for nice drop in swap for converting the...
Looks like Digikey.com has them for 0.85 cents - it's a surface mount though?? Do you have the full part num? Best Regards, Derek Calanchini Owner Creative...
Forgot to mention that if one does use the courtiestown circuit board to build a resistive pulser, the LED should still continue to function. A detail maybe,...
The lowest I went was 1 ohm for the resistive approach... I wonder what sort of bounce back one might get for even low values... (1 ohm gave me 20V pulses at...
... I power up my pulser using a 12V DC supply without connecting it to the battery. When I check the pulser output, I can see the same output with 'the...
... I am thinking that the ringing must be something to do with breaking the crystal. otherwise, the ringing is just useless to the circuit. Many of the patent...
... Hi Owen, Her's a simplified explanation: Both elements - capacitance and inductance - store and release energy, but they do it out of phase with one...
THANK YOU - it is what I have been saying all along.....However, inductance is a property of ANY material which flows electricity, hence the entire circuit...
... Inductance goes with a magnetic field, if one has a wire that loops back on itself, one can make a near inductance free resistor, since the magnetic fields...
... What is responsible is the swapping of energy back and forth between the inductance and capacitance. If there is no swapping, there is no ringing,...
Capacitors also experience a recovery voltage http://www.rubycon.co.jp/en/products/alumi/pdf/RecoveryVoltage.pdf that might relate to that in lead acid...
I just thought to mention that the TLC555 is a drop-in replacement for the usual 555, but 2MHz capable ($1.69 from RadioShack); this is for the resistive...
I finally have some TO220 resistors (1.4 ohms) on the way, so should soon be able to report on a non-prototype version of the resistive pulser. I picked TO220...
You either need a good hobby computer charger (Like a Triton) or a Midtronics battery tester...there are less sophisticated methods if neither is possible....
Andy/ Derek, Fear not I shall join in the testing although I'm currently focusing on building a Stan Meyer cell to the same specification as Scott Cramton. I...
Wonderful, I should soon have all the details on how to modify the courtiers town circuit board; hopefully having it run at 1MHz without getting too hot; I'm...
Yeah, let me know too.I use the High power version of the couriestown circuit.not sure if that makes any different.though I do have the low power kit I haven't...
The 555 has a high time t1 and a low time t2 given by: t1 = 0.693 (r1 + r2) c t2 = 0.693 r2 c So for the Couper circuit with r1 = 470 kΩ, r2 = 22 kΩ...
I thought to first try: r1 = 180 k Ohm;, r2 = 10 k Ohm; and c = 27 pF to yield: t1 = 3600 nS t2 = 190 nS this would be 270 kHz operation, and not the full 1MHz...
All my resistive calculations were based on a resistive on-time of 200 nS and some people might be wondering where this figure came from. The answer is from...
Andy, Tried this with R1 at 180k, R2 at 10k and C2 at 33pF. Didn't rig my scope up as I ran out of time. I used an LM555N which seemed to be still working. I...
Very, very nice... Acceptable temperatures, and I am looking forward to knowing about the oscilloscope plots; the voltage bounce, frequency, etc. I need to...
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