Tag: Oscillator

  • The Astable Multivibrator

    One of the first circuits I ever build on a breadboard was the ubiquitous astable multivibrator. Two NPN transistors, two capacitors, two LEDs and four resistors. It’s a circuit that just about every electronics engineering student and hobbyist builds at some point in their life. Sure, a 555 in astable mode uses fewer components, and […]

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  • Simple Digital Noise Generator

    Here’s a little noise-making circuit I’ve been working on. It has a sound reminiscent of vintage sound chips, such as the AY-3-8910. It works by using a D flip flop clocked by a 555 timer to sample and hold the signal from a ring oscillator. The high speed and frequency instability of the ring oscillator […]

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