This amplifier was found in a 1957 Rayrtheon documentation. The circuit can be fitted with a BC558 transistor. Driver and output transformers can be obtained from unused transistor radios.
A precision 200 kHz oscillator using a 32,768 kHz. caf crystal can be built with a 4080 IC as...
In the figure there is a configuration that uses a 4-input trigger NAND port, such as 7413, 7414,...
This interesting circuit found in an old documentation uses neon lamp to indicate the percentage of...