250 V Transistor Amplifier (CB14751E)

This circuit was found in the old Mullard transistor reference manual from 1960. The circuit uses a germanium transistor from the time.

Gel Battery Charger (CB6053E)
We found this circuit in an 80's Electronic Design. The circuit uses an integrated of the time....
TTL Optical Switch II (CB16931E)
In this circuit we have the use of a phototransistor of any type. The 47k resistor can eventually be...
Homemade Soldering Gun (CB10020E)
In the figure we show how to use a common transformer by changing its secondary to obtain a...