This circuit from Radio Electronics from February 1983 shows how to use a clock radio in home appliance control. The circuit uses Triacs and TTL logic.
We found this circuit in a technical documentation on the National Semiconductor LM3909. The...
The LEDs act as diodes, so if good they will show the same characteristic curve. Arrangment shown...
This circuit is from an old English publication from 1968. We can implement it with TIP32...