Negative Ion Generator (CB25366E)

We found this voltage multiplier circuit in a Radio Electronics magazine from December 1991. The high voltage transformer is an adapted flyback

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Differential instrumentation amplifier (CB9841E)
This instrumentation amplifier with differential inputs was found in documentation from the 90s....
Wattmeter (CB23581E)
This circuit is from a Radio Electronics magazine from December 1958. The indicator instrument is analog...
DC to DC converter (CB8749E)
Found in a 90s 303 Circuits, this circuit has an output power of 100 mW. L1 consists of 890 turns...