> What signal is than connected to the basis of Q3?
It's an antenna input. The circuit is used to detect manipulation using things like a piezo crystal from a lighter to confuse the circuit.
We actually did this many years ago with a Phoenix cabinet.
> Regarding the paddles: Given the input nature of the circuit I would keep the
> existing black box solution. Anything else IMHO is a overkill. The circuit is not
> exact by design. If it would have been, there would be no variable resistor for
> calibration.
Yes, that's what I had in mind anyway. The model of the 555 is only capable of simulating the monostable mode anyway. If any circuit with a 555 as clock generator comes along, I'd have to take some measure to distinguish them.
|
Index 
Flat 
Re: Analog emulation
Reply
Re: Analog emulation
