Using the 741 this basic circuit was found in the November 1973 Radio Electronics magazine. The power supply must be symmetrical. The components can be recalculated for other frequencies.
This flasher for power loads such as lamps and LEDs uses a 555 as an oscillator. The supply...
August 2017 - Heat sinks for use with Arcol / Aluminum resistors can be obtained from Mouser...
Found in Radio Electronics from the 90s, this circuit generates signals in the 60 Hz to 1.4 Hz...