The only parts of the schematics I could identify where analog components would make a difference are:
a) Paddle signals
These are generated by 555 circuits in a modified monostable configuration. Looks like a PWM circuit. The 555 is triggered by the 256V signal. So the output is a signal at 256V frequency with pulse width most likely proportional to the paddle position. The circuit can be calibrated with a variable resistor. The pulse width is about 8 ms (without paddle connected) , 256V at 60Hz refresh occurs every 16 ms. ==> Pulse width should between (guess!) 1ms and 15ms.
I'd recommend to use a black box. Emulating this is tricky (diode between THR and DIS) and the paddle connected to control voltage. I would use Switcher CAD III to get an idea what you get.
b) Transistors (single and darlington)
This may be related to reset. However the darlington (the two transistors where C is connected to B of the next) circuit does not look right. It seems to be missing a resistor to +5V.
BTW: The coin circuit does not look right as well. I looks like some resistors are missing.
Regards,
Couriersud
|
Index 
Flat 
Re: Analog emulation
Reply
Re: Analog emulation
