This TTL shield with high level logic is from the LM111's own 80's manual. The integrated circuit is no longer easily found, but the circuit can be adapted to use modern equivalent operational amplifiers.
This sole beacon which has a battery charged by photocells was found in documentation from 1991....
The supply voltage of this circuit can be between 4 and 20 W. The power depends on the voltage and the...
This 555 IC circuit was found in the November 1994 issue of Radio Electronics magazine. The...