Ion generator (CB7837E)

This negative ion generator was found in a 90s Popular Electronics. The autotransformer can be an automobile ignition coil.

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Programmable analog filter (CB20937E)
This circuit was found in an Electronic Design. The circuit can be programmed to operate in...
NAND Gate with 1 Transistor II (CB19883E)
We show in the figure how to implement the No-AND or NAND logic function using a general-purpose transistor....
Phase Shift Oscillator (CB21116E)
This circuit uses a general-purpose transistor and has waveform adjustment. We found it in an...