Playback Amplifier (14W)

This 7-tube circuit was obtained from an American publication in 1947. The circuit has a push-pull output with a source using a transformer.

| Clique na imagem para ampliar |

Stepper Motor Control (CB13805E)
This configuration was found in a 1976 publication. The outputs of the logic circuits are applied to...
Frequency to voltage converter 555 (CB25990E)
With this circuit it is possible to measure frequencies up to about 500 kHz using a common...
Touch Action Switch (II) (CB146)
The very high-input impedance of the CMOS gate allows this kind of device to be used as a...