Dial Tone Generator (CB5984E)

This circuit is from an old documentation making use of a 3,579,645 MHz analog color television crystal. The audio amplifier supports the equivalent.

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Long Intervals RC Timer MC34001 (CB15274E)
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Light Sensitive Relay with 741 (CB25478E)
This circuit for 12 V relays was found in the July 1992 Radio Electronics magazine. The circuit is set...
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The figure shows how to add a Darlington stage to an operational amplifier in order to obtain a...