This circuit is from Mullard 1969 documentation. The circuit operates at a relatively high supply voltage and has a 10 Vpp output. The transistors are of the time, but admit equivalents.
This circuit for medium and short wave range was found in an American documentation from 1992. The...
This circuit consists of an inverter powered by only 4.5 V. The circuit is from a 1967 Mullard...
This amplifier for hearing aid was found in a 1968 documentation using an integrated of the time....