Tony, vee is usually a negative value if you go by the definition.In figure 5 vee was +12 volts.When Stan used 10 volts anywhere he labeled it that way as you pointed out.VEE in figure 6 just powers the ligh,no big deal there.I don't have an image for this schematic.
Ali,the signal coming into firgure 6 is from the Digital Control Means when in auto mode,and the Variable Pulse Frequency Generator when on manual.When in manual mode it will be a square wave 50% duty cycle signal.I have no idea why it won't work in your simulator, don't have alot of faith in them when it comes to Stans work.
The schematic is correct,it's how it was on the board.Tony pointed out a wrong value for one of the resistors in the schematic I posted,did you make that adjustment to you sim?
Don
when i was able to massage the components to make the specified circuit figure 6 work, the triggering went from 10% duty cycle to 50% and then gradually back towards 10%... even though the figure 2 signal was going from 10% towards 90%
so i came up with a better alternative that will work with up to 20 VDC that simulates correctly.
I will wait to see if anyone builds the 74122 version and then post my actual scope results from my cd4538 version
as long as the end result is the same who cares what the schematic or components are.
Don have you tried running both simulations i posted?
Also Don, what frequency range are we shooting for on the variable pulse freq. gen fig 12 ?
will the fact that there are divide by 2 chips on FIG 12 cause a perfect 50% duty cycle, becausecause those 555 timers are terrible on their waveform for output
