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Input high, pulse at output#1. Input low, pulse at output#2

D

dannyf

Joined Sep 13, 2015
2,197
Use some nand gates.

one, use some of the gates to build an oscillator to generate the pulses.

two use the remaining gates to enable different outputs.

four gates are sufficient.
 
AnalogKid

AnalogKid

Joined Aug 1, 2013
11,056
In the rest condition, the voltage at pins 5 and 9 should be 12 V. Those pins pulse down to zero for about 1 second, causing the inverter outputs to go high and turn on the output transistors.

ak
 
H

Thread Starter

hermhart

Joined Feb 16, 2011
20
Yeah! It works. I think residual flux on the tracks might have been the culprit. Thanks so much, AnalogKid. Great job.
 
H

Thread Starter

hermhart

Joined Feb 16, 2011
20
Referencing #22, in my troubleshooting I had been monitoring the voltage at pins 5 and 9. Pin 5 goes up to 6v. Pin 9 goes up to 8.5v. That's high enough to do the switching, but if it's supposed to go all the way to 12, then there must still be something wrong.
 
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