3-channel preamp (T484E)

This 4-tube circuit was found in an American publication from 1947. It is intended for audio distribution lines using a transformer source.

| Clique na imagem para ampliar |

Crystal test (CB9622E)
This circuit is one of many that the reader can find in this section for testing crystals. The...
Driver for Electric Typewriter (CB6561E)
This circuit was found in a Philips documentation from 1966. Its purpose is to drive the solenoid...
Oscillator Wien with TLC271 (CB11538E)
This sinusoidal oscillator is suggested by Texas Instruments' Linear Circuits Applications, using a...