Surround Amplifier (CB25265E)

This circuit is from a Radio Electronics from December 1990. The circuit was used in a home theater system.

| Clique na imagem para ampliar |

Inductance Meter (CB4656E)
This complex circuit with many digital components measures inductances in 6 ranges ranging from 100...
Transistor Audio Amplifier (CB920E)
This circuit was found in old publication from 1958. The circuit uses germanium transistor, common in...
Inverter For Multimeters (CB3813E)
Some old analog multimeters use a 22.5 V battery for high resistance measures. These batteries can no...