PI-1 Question

[Al]

I completed the build of the PI-1 pcb and am having some problems setting it up correctly. What amplitude should a returned pulse be? Also, how many microseconds after the pulse to the coil should the main delay be set at?
Thanks for your help, Al.

[Carl]

Re: PI-1 Question

>What amplitude should a returned pulse be? Also, how many microseconds after the pulse to the coil should the main delay be set at?

Probably 200-250 volts on the flyback. Start out with the main delay at 20-30us.

- Carl

[Al]

Re: PI-1 Question

Thanks Carl.
Regarding the amplitude question, I was curious about the pulse the target returns. Is it in the microvolt range?
My flyback pulse is about 450v and I used a 1.6K damping resistor accross the coil and I don't see much ringing. The results I get is about 6-7 inches for a penny in air.
Al.

[Carl]

Re: PI-1 Question

A large, close target can alter the decay by a few millivolts, enough to actually see it on an o-scope. But generally, the response is in the microvolts.

- Carl