This untuned (aperiodic) amplifier circuit was found in the August 1974 Radio Electronics magazine. The transistors are period, and the board layout is critical.
This circuit maintains on a flashing LED at a frequency determined by the capacitor. The...
We got this circuit in an old publication from 1978. The circuit uses a phototransistor and an...
This simple LDO, or low voltage drop regulator was found in an Electronic Design from the 90s. The...