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.
We found this circuit in Radio Electronics magazine from October 1966. The circuit uses a 15 V...
This circuit can be used in decoration or to draw attention, in a “fake” assembly for example. What he...
This simple TTL siren was found in a 1980s Electronics Today International. The power supply is 5 V...