Found in a Popular Electronics from the 80's, this circuit simulates the equivalent card game. The circuit is CMOS and can be supplied with voltages from 6 to 12 V.
Oscillators up to some megaherts can be made with comparators like the LM139, 239 or 339. Theses...
This circuit is regulated by zener and provides a voltage of 9 V. The circuit is from a Radio...
We find this circuit in a 1973 technical documentation. Common transistors may be BC548 and FET or...