Simple Metronome With Transistors

Flip-flop, as an astable multivibrator, can be used to generate timing signal in music: metronome. By adjusting transistor bias resistor using a 100k potentiometer, the charging and discharging time of capacitors can be adjusted to get  proper tick period for the metronome. Here is the schematic diagram of this simple metronome circuit. This metronome circuit can be put in a […]

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Microphone or Electric Guitar Pre-Amplifier with Noise Gate and Compression

In personal electronics and computer audio system, the SSM2167 is a complete and flexible solution for conditioning microphone inputs. It is also very good for improving vocal clarity in communications and public address systems. Although it is not mentioned to be applied for electric guitar in the datasheet, the frequency response of this signal processor shows that it can be […]

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Electronic Drum Synthesizer

The circuit below consists of two “twin-T” oscillators set to a point below oscillation. To set the circuit into oscillation, we can touch the Touch Pad. Here is the schematic diagram of the circuit: By touching the pads in different ways and a whole range of effects are available will produce different effects. Before oscillation, the two 25k pots are […]

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Sound Controlled Activated Triggered LED

When the microphone detects a loud sound, this circuit will turn the LED on. The “charge-pump” section consists of the 100n, 10k, signal diode and 10 uF electrolytic.   Here is the schematic diagram of the circuit: The charge pump section has two functions: rectifying and multiplying  the signal voltage. To illuminate the LED, a signal on the collector of the […]

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