Found in an English publication from the 1980s, this circuit can be built with equivalent transistors such as the BC549. The signal must be applied to an external amplifier.
Found in an English publication, this control is intended for 220 V mains powered motors. However, it...
This circuit was taken from the 1974 Ferranti transistor manual. Transistors are common types at...
For someone who wants to take advantage of a double transformer in a good power supply, we found...