This polarity inverter circuit for voltages down to about -12 V was found in the December 1992 issue of Radio Electronics magazine. The current is a few mA.
You can measure capacitances across a large range of values using the AC Power line frequency as...
This circuit was obtained in a 90s Popular Electronics. It generates a 10 Hz sinusoidal signal...
This circuit was obtained in a 1991 Electronics Handbook of 1991. The publication no longer...