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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7-segment LCD driver (CB7556E)
Found in American documentation from the 90s, this circuit uses TTL technology and is therefore...
Trigger noise suppressor (CB21459E)
Found in a 1968 Electronic Design, this circuit is intended for suppression of trigger noise in...
Line Amplifier (CB19052E)
This amplifier for audio transmission lines was found in a 1961 American publication. The critical...