Push pull amplifier (CB21941E)

Using a pair of CK722s, this booster step of a few milliwatts of power was obtained in a 1960 Gernsback publication.

Pre with RIAA equalization uA709 (CB19619E)
This circuit is from old documentation, which means that the operational used is not easy to...
Two tone siren (CB9085E) This circuit was found in a 1980’s Radio Electronics. The signal must be applied to an amplifier stage. Capacitors can be changed to change effects. img src="images/stories/bc/144064"
Two tone siren (CB9085E) This circuit was found in a 1980’s Radio Electronics. The signal must be...
Charger with battery status indicator (CB21566E)
Based on Texas Instruments documentation, this circuit is based on the BQ2000 a circuit used to...