This circuit uses only transistors and was found in a 2003 documentation. Transistor 2N3055 must be mounted on a heat sink and the voltage is set to R10.
The MOS field effect transistors of this circuit are not very common, as it is a project from the...
This old circuit uses na operational amplifier not easy to find in these days. But the circuit can be...
This circuit consists of an astable multivibrator whose frequency changes according to the light...