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.
In the figure we have the way to use a 555 with hysteresis. The circuit is from old documentation and the...
Direct current motors from 5 to 12 volts and currents up to 2A can be controlled with this...
This circuit uses a NAND port to convert rectangular signals from 50 kHz to 1 MHz into triangular...