Basic stamp board witstanded direct 12kV hit, but it seems to be affected by EMP ?
CuriousOne
Posts: 931
A quite strange and weird situation.
I'm building a high power strobe flasher, which is being controlled by basic stamp 2 board. Nothing sophisticated - voltage tripler and stabilization board, 2000uf 600v capacitor, trigger coil and strobe lamp. Basic stamp, according to keypresses, output pulses of various duration, via PULSOUT statement. The circuit as follows: Basic stamp 2 output, via 470 ohm resistor, connected to FOD817 optocoupler. The FOD817 transistor itself triggers the scr, which discharges 0.1uf capacitor into transformer, which outputs 12kV pulse for ignition. The basic stamp and strobe circuit use galvanically isolated power supplies for safety.
Initial tests were conducted with old minolta 4000AF flash, which worked just fine. However, when I scale things up, (connect FOD817 output to the more powerful circuit), it all messes up. The flash gets triggered only once, and basic stamp module hangs. Have to cycle power to make it work again. I suspect, the EMP created with strobe discharge, causes the problem? for obivous reasons, both circuts are about 10 inches away from each other.
Funny to note, that accidentially, the 12kV output from transformer slipped off, and was discharging into bs2 module GND pin, but module still works fine!
I'm building a high power strobe flasher, which is being controlled by basic stamp 2 board. Nothing sophisticated - voltage tripler and stabilization board, 2000uf 600v capacitor, trigger coil and strobe lamp. Basic stamp, according to keypresses, output pulses of various duration, via PULSOUT statement. The circuit as follows: Basic stamp 2 output, via 470 ohm resistor, connected to FOD817 optocoupler. The FOD817 transistor itself triggers the scr, which discharges 0.1uf capacitor into transformer, which outputs 12kV pulse for ignition. The basic stamp and strobe circuit use galvanically isolated power supplies for safety.
Initial tests were conducted with old minolta 4000AF flash, which worked just fine. However, when I scale things up, (connect FOD817 output to the more powerful circuit), it all messes up. The flash gets triggered only once, and basic stamp module hangs. Have to cycle power to make it work again. I suspect, the EMP created with strobe discharge, causes the problem? for obivous reasons, both circuts are about 10 inches away from each other.
Funny to note, that accidentially, the 12kV output from transformer slipped off, and was discharging into bs2 module GND pin, but module still works fine!
Comments
Have a 'scope handy? Monitor the BS2's reset pin for glitches.