Precision Full-Wave Peak Detector: Detect The Envelope of An Audio Signal

This circuit detect the amplitude of audio signal, suitable for audio level detection that demand for high precision. Amplitude detection or signal envelope detection is usually implemented using a peak detector. An ideal amplitude detector give continuous level at any time because the amplitude of a sine signal (every signal can be seen as sine signal combination) is exist and […]

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Precision Half-Wave Peak Detector

A simple half-wave peak detector using a single transistor is very compact and low cost, but if the application require precise detection for signal under 100mV then that circuit become useless. Here you can use more precise half-wave peak detector circuit using only a single op-amp with few passive components. Look at the circuit’s schematic diagram of the peak detector […]

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Single Transistor Half-Wave Peak Detector Circuit

Using only a single transistor and few passive components, you can build a fairly sensitive peak detector. circuit This peak detector circuit is suitable for audio application, since the average sum of positive and negative cycle of audio signal has equal value. You can find a peak signal although you only detect the peak of positive cycle. Here is the […]

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Single Supply Zero Crossing Detector

Zero crossing detector is used to convert sine wave or other signal into square-wave, the output should be low if the input is negative and high if the input if positive. Many zero crossing detector use split supply (symmetric supply), but this zero crossing detector circuit only need a single supply, thus suitable for battery-operated circuits. Here is the schematic […]

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Square Oscillator Using Comparator: The Circuit Schematic Diagram and The Formula

Using a single supply quad comparator LM339, LM239, LM2901, LM2901V, NCV2901, or MC3302, we can build a square-wave oscillator with simple circuit and formula. Here is the schematic diagram: This circuit is suitable if you need  many square-wave oscillators in one circuit, since the quad packaged comparator provide four comparators in one single  integrated chip. [circuit’s schematic diagram source: Motorola […]

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Inverting Comparator With Hysteresis

Comparator with hysteresis (Schmidt trigger) can be built using  LM339, LM239, LM2901, LM2901V, NCV2901, or MC3302  quad single supply comparator integrated circuit chips. Here is the circuit’s schematic diagram and formula: This circuit’s output will swing to high or low using two threshold values. If the last output is high, then the output can be changed to low if the […]

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