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1Mhz-voltage-to-frequency-converter – Circuit Schematic
1Mhz-voltage-to-frequency-converter
This stabilized voltage-to-frequency converter features 1 Hz -1.25 MHz operation, 0.05% linearity, and a temperature coefficient of typically 20 ppm/°C. Thi...
Low-cost-voltage-to-frequency-converter – Circuit Schematic
Low-cost-voltage-to-frequency-converter
The 741 op amp integrator signal is fed into the Schmitt trigger input of an inverter. When the signal reaches the magnitude of the positive-going threshold ...
Voltage-to-requency-converter – Circuit Schematic
Voltage-to-requency-converter
Circuit has a 1 Hz-to-30 MHz output, 150-dB dynamic range, for a 0 to 5 V input. It maintains 0.08% linearity over its entire 71/3 decade range with a full-sca...
Simple-vco – Circuit Schematic
Simple-vco
The output frequency of the VCO, U1, varies inversely with the input voltage. With a 1 "V input, the oscillator output frequency is about 1500 Hz; with a 5-V...
Vco – Circuit Schematic
Vco
At startup, the voltage in the trigger input at pin 2 is less than the trigger level voltage, "13 VDD. caus ing the timer to be triggered via pin 2. The output ...
Logarithmic-sweep-vco – Circuit Schematic
Logarithmic-sweep-vco
This circuit uses the output of the IGL8049 to control the frequency of the IGL3038 waveform generator; the 741 op amp is used to linearize the voltage-frequen...
Variable-capacitance-diode-sparked-vco – Circuit Schematic
Variable-capacitance-diode-sparked-vco
You can transform a 7415124 multivibrator into a wideband VCO by replacing it conventional fixed capacitor with a variable-capacitance diode. The only disadvan...
Waveform-generator-stable-vco – Circuit Schematic
Waveform-generator-stable-vco
In this circuit, a waveform generator is used as a stable VCO ...
Balanced-tmos-vco – Circuit Schematic
Balanced-tmos-vco
This TMOS VCO operates in push-pull to produce 4 Wot 70 MHz. It consists of two MFE930 TMOS devices in a balanced VCO that generally provide better linearity t...
Electronic-voice-substitute – Circuit Schematic
Electronic-voice-substitute
The 555 acts as the tone generator configured in the astable mode. Its pin 3. square-wave output is transformed into a triangle wave by Rl and C2. The voice"s ...
Ultrasonic-pest-controller – Circuit Schematic
Ultrasonic-pest-controller
This circuit consists of two basic parts: an oscillator tuned to 40kHz, and a voltage doubler with pulse generator. The pulses are about 10 ms long and occur 2...
Ultrasonic-pulsed-pest-controller – Circuit Schematic
Ultrasonic-pulsed-pest-controller
IC2 forms a stable oscillator whose frequency and pulse width is determined by the values of R4, R5, R6, and C4. R4 is made adjustable for precise frequency se...
Ultrasonic-pest-repeller – Circuit Schematic
Ultrasonic-pest-repeller
This circuit is a 555 timer IC connected as a square-wave generator. Its base frequency is approximately 45kHz, as detennined by the values of Rl, R2, and Cl. ...
Tremolo – Circuit Schematic
Tremolo
A phase shift oscillator using the LM324 operates at an adjustable rate, 5-10 Hz, set by the speed pot. A portion of the oscillator output is taken from the de...
Tremolo – Circuit Schematic
Tremolo
The VCO of Ul, a phased-locked loop. produces a low-frequency square-wave signal from 5 Hz to 2500Hz, which is controlled by varying the voltage to pin 9 via R...
Implantable-ingestible-electronic-thermometer – Circuit Schematic
Implantable-ingestible-electronic-thermometer
This oscillator circuit includes a quartz crystal that has a nominal resonant frequency of 262,144 Hz and is cut in the orientation that gives a large linear c...
Teslacoil – Circuit Schematic
Teslacoil
Power is fed to transformer Tl, a small neon-sign transformer, which steps the voltage up to about 3000 Vac. The stepped-up output of Tl is fed through L1 and ...
Simple-tesla-coil – Circuit Schematic
Simple-tesla-coil
The Tesla coil described here can.generate 25,000 V. So, even though the output current is low, be very careful! The main component is a flyback transformer fr...
Simple-touchtonetm-generator – Circuit Schematic
Simple-touchtonetm-generator
The oscillator is a Motorola MC14410CP chip using a 1-MHz crystal. The chip generates both the high and low tones, feeding the energy to the amplifier through ...
Extended-play-circuit – Circuit Schematic
Extended-play-circuit
A single op amp-one of four contained in the popular LM324-is operating in a variable pulsewidth, free-running squarewave oscillator circuit, with its timed ou...