Programmable Twin T Band Pass Filter (CB6244E)

This circuit was found in an American 1980s documentation. Dual FETs can be replaced by single equivalents. Control voltage ranges from 0 to 1 V.

| Clique na imagem para ampliar |

Fluid Flow Monitor (CB12461E)
This circuit is from a 1995 technical documentation. The transistor can be a BC558 and the sensor...
Telephone line tester (CB8710E)
Found in a Popular Electronics from the 90s, this circuit checks the presence of voltage on a...
Old Phonograph Amplifier (CB1416E)
The critical component of this amplifier is the output transformer. We found the circuit in an old...