Oscilloscope-Triggered Sweep using 555 IC

We can use the 555 timer to hold the cost down of adding a triggered sweep to an economy oscilloscope. The timer is triggered by the circuit’s input op amp, adjusting its flip-flop and cutting off its discharge transistor so that capacitor C can charge. The flip-flop resets and the transistor conducts when capacitor voltage reaches the timer’s control voltage […]

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Wien Bridge Sine Wave Oscillator

Getting the right amplifier loop gain is the major problem in producing a low distortion constant amplitude sine wave. However, we can solve this problem with Wien bridge sine wave oscillator. Here is the circuit : This circuit uses the 2N3069 JFET as a voltage variable resistor in the amplifier feedback loop. The voltage reference for the peak sine wave […]

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Pure Sine Wave Generator

This is a circuit that can generate 1kHz to 25kHz sine waves with a THD better than -80dB. This circuit consist of a 4th-order low-pass filter, a TTL counter and 8-channel analog multiplexer. Here is the circuit : The bipolar dc input of multiplexer is provided by two resistive dividers connected from ground to VDD and ground to VSS. The […]

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