Amplifier stage (CB21821E)

This circuit was found in Mullard's 1960s transistor manual. The circuit employs contemporary germanium transistors and operates at 1.65 kHz.

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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"
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Based on Texas Instruments documentation, this circuit is based on the BQ2000 a circuit used to...