This sensitive circuit for triggering relays was found in an old English publication. It works with alternating signals applied to its input. Transistors are general purpose types.
This stage of low power audio amplification was very common in devices powered by the 60's and...
This charger was found in an 80's Electronic Design. The circuit uses components from that time....
Found in a 1980s American documentation, this crystal-controlled oscillator generates 100 MHz...