Questions tagged [vf-fv-converter]

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LM2917 Vout decrease with fixed frequency input along time

The problem: LM2917 Vout decrease with the same input frequency along time. The LM2917 input is the Hall sensor (APS11450) output. The sensor reads 8 magnet per revolution. Fixed frequency about 30 Hz....
Pablo's user avatar
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Differential voltage to frequency

Edited to clarify some questions I’m working on a design that will take a 0.5V-4V signal from a laser displacement sensor (Keyence Il-1000) and convert it to a frequency signal (0.1-2Mhz) for input to ...
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1 vote
1 answer
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Frequency-to-Voltage Converter: Unexpected Stability Regions

I am using an AD652 as a synchronous frequency-to-voltage converter in the layout shown below. I conducted a series of measurements of the output voltage (Vout) across a wide range of input ...
Dani's user avatar
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Threshold ramp frequency voltage converter

My issue is understanding how the socalled "threshold ramp frequency voltage converter" (translation from Italian) works. In what follows the block diagram and in the next picture a time ...
Stefano Fedele's user avatar
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1 answer
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Working of Voltage-to-Frequency Converter

I have seen this circuit in a thesis "Voltage to Frequency Converter: Modeling and Design" submitted by Jyoti Ranjan Behra and Rajesh Kumar Barik (thesis abstract, thesis document). In the ...
Kiran's user avatar
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Require help designing VFC (voltage to frequency converter) circuit

I need to use a VFC (voltage to frequency converter) circuit that operates with bipolar voltage (-10 V to +10 V) and with a bias (i.e. when the input is within +/-2.5 mV, the VFC shall not produce any ...
gari's user avatar
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3 answers
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why three phase induction motor draws current with spike at low frequency by using VFD?

I have built Variable frequency drive (VFD) for a three-phase induction motor using V/F constant control. while I was testing 15HP three-phase induction motor without load with my VFD, the motor draws ...
James Hock's user avatar
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1 answer
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Designing a senvitive frequency to voltage converter

I need to make a battery powered frequency to voltage converter that will monitor very minor frequency changes, around 100Hz with base frequency of 3-5MHz (may vary during operation); something like a ...
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11 votes
4 answers
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How do I use pin5 to control duty cycle of a 555 based PWM?

I have built a simple PWM using a 555 IC to drive a motor for an optical chopper and I want to be able to use the output of the chopper signal as a speed correction feedback for the PWM. I think I ...
Jonathan's user avatar
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Problem connecting INA114 with LM331 for voltage to frequency conversion

i'm actually using a load cell and i would like to send the load cell information to an android tablet through jack audio. Then load cell caracteristics are presented here: http://www.phidgets.com/...
Nad92's user avatar
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3 answers
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Low power Analog signal Isolation

In my project, the current budget is very tight. With less than 1mA, I have to isolate sensor's signal voltage and be able to measure it with ADC on the other side of the isolation barrier. What I ...
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Frequency-To-Voltage Convertor With LM2917

I'm trying to make a frequency-to-voltage converter by using LM2917. Its datasheet is very old and it doesn't explain function of the IC well. It just gives several example circuits and a formula for ...
hkBattousai's user avatar