Model speed control (CB5375E)

This circuit is from an 80's documentation. The BC108 can be replaced by the BC548 and the 2N3055 must have a heat sink. The pot is wire wound.

Speed control for car or model railroad (CB5417E)
This circuit for modeling was found in a 1980s documentation. The SCR can be the TIC106 and the...
Phase Shift with a Transistor (CB5439E)
The transistor may be the BC548 in this circuit for low frequency signals. We found it in an old...
Unijunction monostable (CB5425E)
This circuit was found in an American 1980s documentation. The transistors admit equivalents and the...