We found this circuit with transistors in a Philips documentation from 1968. The double transistor can be replaced by discrete married types. The power supply is symmetrical.
In the figure we have the way of obtaining 220 V from two equal 110 V transformers or 230 V from...
In the figure we have an RF amplifier for tunnel diode. The frequency range will depend on the...
This circuit can be supplied with voltages of 6 or 12 V, depending on the relay. The transistor can be...