Insulated switch (CB21249E)

We found this circuit in a Popular Electronics from the 90s. The field effect transistor can be of any type.

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Control Car Alarm and Electric Locks Through Remote Control Interface (CB18104E)
The circuit we have just described has been mounted in the car of the author of the project for...
Transistorized Audio Amplifier (CB11859E)
This pair amplifier complements BC548 and BC558 provides a power of a few hundred milliwatts of...
1-minute delay with Triac (CB21406E)
We found this circuit in a 1965 General Electric manual. The controlled load depends on the Triac...