This amplifier was found in a tube equipment manual from 1947. The high-fidelity circuit has pentode tubes at the output and a source with transformer.
This receiver for infrared remote control was found in the Philips Databook of 1990, The circuit...
This very low current circuit was found in the April 1995 issue of Electronics Now magazine. The...
We found this circuit in a documentation from the 50s. It is based on CK722 germanium transistors. The...