> > > The coin switch looks wrong. With this circuit you would be able to connect a TTL > > > output directly to GND: > > > > The coin switch is right. It's quite common to use this setup of two inverters to > > kill noise while opening or closing a switch. The left inverter has about 14 ns of > > short circuit before it goes low on the output, driven by the right inverter's high > > ouput. > > > > > Unrelated to burning TTL circuits alive: I really do not see any necessity here > to > > > solve any differential equations in the complex plane (Current, Voltage). If this > > > would be anywhere near economically feasible it would be in the mame discrete > > > emulation by now. > > > > Ok.
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