Archive for the ‘Basic Function Circuits’ Category
Accurate Low-Cost Square-Root Converter
This is a Low-Cost Accurate Square-Root Circuit. This circuit is used to provide a square-root function with a good accuracy. The benefit of This circuit is cheap. This circuit produce a current output which can be used to be converted to voltage by a summing junction current-to-voltage converter or to drive a meter directly. This …[Read More]
Low Distortion Crystal Oscillator
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 …[Read More]
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 …[Read More]
Frequency Source with Digital Control
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 …[Read More]
TC9400 Frequency-to-Voltage Converter
This is a TC9400 Frequency-to-Voltage Converter circuit. Beside used as voltage to frequency converter, the TC9400 can also used as Frequency-to-Voltage Converter. The TC9400 will convert the input frequency waveform to output voltage linearly. This circuit has a threshold detector’s input that is used to detect each zero. The zero will cause a precise amount …[Read More]
TC9400 10Hz to 10kHz Voltage-to-Frequency Converter
This is a TC9400 10Hz to 10kHz Voltage-to-Frequency Converter circuit. This ciruit uses TC9400 to convert voltage to frequency. The TC9400 uses charge balancing principal. This circuit uses input resistor to convert the input voltage to input current. Then the capacitor will change the current into charge which will decrease the Op amp output voltage …[Read More]
Variable Q Twin-T Notch Filter
This is a Variable Q Twin-T Notch Filter circuit. This circuit is used when low Q is needed. The Lower Q gives some advantages in rejecting the signal where the signal deviate slightly from the null of the notch network. The Q of this circuit can be adjusted from 0.3 to 50. This circuit has …[Read More]
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