Call Sound Amplifier (CB21273E)

Found in an older Radio Electronics, this circuit generates signals that can be used with regular analog telephones.

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Triac and UJT Dimmer (CB857E)
This high power dimmer uses a unijunction transistor to trigger the triac. The triac is choosen...
327 Hz High Pass Filter (CB13506E)
This frequency corresponds to musical note C3. Frequency accuracy depends on the accuracy of the...
Transformerless power supply (CB21159E)
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