This Motorola circuit is from 1965. Collector currents must be 7 and 12 A for transistors. Equivalents may be used. The circuit is for contact breaker cars.
This operational amplifier circuit with variable gain was obtained in an 80's Electronic...
The circuit shown was obtained in American documentation from 1968. MOSFETs can be replaced by...
We found this circuit in a Popular Electronics from the 80s. This circuit eventually doesn't work with...