This filter was found in Exar documentation from the 1980s. The circuit has an attenuation of 60 dB at the selected frequency. The power supply must be symmetrical.
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...