This analog meter circuit was found in the September 1989 issue of Radio Electronics magazine. The source must be dual, and the table gives the resistors for the various scales.
This charger for currents up to 100 mA was found in a 1980 publication. The transistor could be...
Found in Mallory documentation from 1968 this circuit uses an integrated circuit from that time. The...
The frequency produced by this oscillator depends on the temperatire sensed by a thermistor. The...