Based on the MC1488 or MC1489 operational amplifiers, this circuit has a 5000V isolation driving a 2N3055 transistor for a high-power signal. The receiver is a common phototransistor.
The circuits below were found in amarican publication of the year 1958. The transistors are...
With this circuit it is possible to use a control voltage to select audio signals that pass...
This PLL with operational amplifiers was found in 1969 documentation. The configuration can be...