4093 Sine Square Converter (CB26335E)

Found in a Popular Electronics from the 90s, this circuit operates up to about 5 MHz input.

Multitester (CB17090E)
This sensitive multi-circuit and component prover uses two transistors and has a switch position where...
Regulator for Bench Power Supply LM117 (CB14506E)
The LM117 (217 and 317) provides 1.2 A with output up to 25 V and is manufactured by several...
455 kHz Amplifier (CB4219E)
Found in a 1980s documentation, this amplifier uses an integrated circuit that is not easy to...