1 kW synchronized switch (CB9266E)

Found in a 1967 RCA documentation, this circuit can be made with equivalent SCRs according to the load.

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Active Inductor (CB5342E)
This circuit is from an 80's electronic component manual. It has the way to simulate an inductor...
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This is the receiver for the previous circuit found in the November 1991 Radio Electronics...
Frequency switch (CB8095E)
This circuit was found in a Popular Electronics documentation from the 90s. It is possible to switch...