12 V Power Supply (CB24505E)

To power small projects, we found this circuit in the Radio Electronics magazine of May 1977. The transistor must be equipped with a heat sink.

| Clique na imagem para ampliar |

Resistance Multiplier (CB19497E)
The idea of this circuit is to obtain a resistance of 10G ohms using an operational amplifier....
IR Illuminator for Night Vision Cameras (CB20973E)
This circuit was taken from a Popular Electronics from the 90's. The power step can be changed to...
Recording head amplifier (CB24226E)
The figure shows how to use an operational amplifier with a low impedance head. The gain is...