12W Amplifier (T493E)

This amplifier for playback of recordings was found in a 1947 manual. It uses a push-pull output with a tube power supply.

| Clique na imagem para ampliar |

Wiretapping Transmitter (CB19320E)
This circuit was found in a 90's espionage publication and serves for analog lines. The circuit is...
Beat Oscillator (CB16896E)
This circuit is used in short wave receivers that do not have the BFO (Beat Frequency Oscillator) for...
Double Flasher 555 (CB20943E)
Found in Popular Electronics from the 1980s, this circuit shows how to drive two charges...