Audio Booster (CB6181E)

This reinforcing stages from a 1960s documentation. No information is given about the transformer and the transistor admits equivalents.

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High Q Filter (CB25362E)
This 1/2 hertz high selectivity filter was found in the December 1990 issue of Radio Electronics...
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The two power steps below are intended for use with the SAA1027 stepper motor control but can be...
Mexican Siren (CB17515E)
This interesting circuit, found in a 1986 publication, includes a powerful audio amplifier. Being...