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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Active Low Pass Filter (CB14916E)
The frequency of this circuit depends on C1 and, for the indicated values, it is 1 kHz. Equivalent...
Amplifier for 12 V (CB8962E)
This configuration with the LM383 appears elsewhere on this site. The circuit shown was obtained...
1 MHz FET Oscillator (CB6148E)
This circuit was obtained from HAM Radio magazine in an 80's issue. The FETs are types of the time...