This circuit is from the 1992 Radio Electronics Handbook. The components used are from the period, with emphasis on the 2-digit display driver.
This amplifier with the RCA CA3018 integrated circuit was found in the August 1970 issue of Radio...
This circuit generates sinusoidal signals that depend on the input oscillator. The circuit is from...
This fast-acting circuit uses any phototransistor as a sensor. The circuit drives a 30 V relay, but...