Synchronized automatic switch (CB9260E)

This control circuit up to 1 kW was found in a 1967 RCA documentation. The components are from that time, and modern equivalents can be used.

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Slow Turn On Power Supply For Amplifiers (CIR815E)
This circuit is used to cut the “click” in the loudspeaker of amplifiers when they are turned on....
Trigger generator for inverters (CB7270E)
Found in RCA documentation from the 1970s, this circuit is intended for firing thyristors in inverter...
Reed Switch triac control (CB12238E)
In the figure we have the way to control a TIC series triac with a reed switch. The current in the...