Free electronic circuit design and schematic diagram
The reason why TC9400 V/F converter is very useful in the laboratory are because it’s portable, battery-operated, and low cost frequency source. Both pulse and square-wave outputs are provided by the TC9400. A triangular waveform can also be generated by adding an op-amp integrator. The outputs can be frequency-modulated via the FM input. [Circuit’s schematic diagram source: Microchip Application Note]
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This circuit is a Delayed Pulse Generator that is used to provide pulse rate and independent control of initial delay. The pulse generator of this circuit is IC1c which the operation is depended on the normally low O/P of the IC1a. The PB1 is used to make the circuit input goes low. When PB1 is pressed, IC1b O/P goes high […]
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This is a Low Distortion Crystal Oscillator circuit. This circuit generate a sinewave that has low phase noise and distortion. This circuit can be used to perform a crystal with less than 1mV dissipated in crystal. The crystal is used to filter the signal current. If the impedance loads is low, the JFET will drive the impedance. when the loads […]
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This is a Voltage Controlled Oscillator (VCO) circuit. This circuit is based on Hartley oscillator. The frequency depend on the value of C1 and L1. The oscillation-frequency will change as the change of the capacitance in the varactor BB132 by The Vtuning voltage. The maximum frequency that can be changed is determined by th value of C2. For large frequency […]
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This is a frequency source system that is controlled by a digital (microprocessor/microcontroller) system. This circuit produces a square wave signal with adjustable frequencies. Here is the block diagram of digitally controlled frequency source system: This frequencies are controlled by microcontroller register, counter or thumb-wheel switches. This system can be used in many applications like numerically-controlled machine tools and computer-controlled […]
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The following circuit diagram show us another kind of CMOS oscillator. It’s will always oscillate because its a loop of three inverters. It would oscillate at a very high frequency (MHz) without the RC components depending on the propagation delays of the inverters. The RC branches give a phase shift of 60′ at some frequency, so the overall phase shift […]
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Below is a relaxation oscillator circuit using a 74HC14, an inverter with a Schmitt trigger input. It’s mean that the transition point for an increasing input is higher in voltage than the transition point for a decreasing input. The difference is called the “hysteresis.” Such an input is very useful for a slowly-varying inout or one with noise. The opposite […]
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