This is the typical audio amplifier for a 1967 television. We found it in a magazine from the time. Note the use of the output transformer and the high supply voltage. The circuit is an RCA CTC21.
This circuit visually indicates that a high voltage is present in an outlet or other point. The...
This circuit for 3.3 V logic circuits has a 5 V input and the maximum output current is on the...
We found this circuit in an old optoelectronics manual from Texas Instruments. However, more...