Full Wave Control (CB6554E)

This 1968 Texas Instruments circuit uses diacs of the era. SCRs can be modern equivalents according to the controlled load.

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MW Receiver powered by a Galvano Telluric (CB11144E)
This circuit of a publication from the 70's uses a different type of power that we had already...
Flasher LM2931 (CB15324E)
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327 Hz High Pass Filter (CB13506E)
This frequency corresponds to musical note C3. Frequency accuracy depends on the accuracy of the...