# Voltage to frequency converter

Discussion in 'General Electronics Chat' started by pranav_shenoy, Feb 17, 2015.

1. ### pranav_shenoy Thread Starter New Member

Feb 17, 2015
12
0
Can anyone send me circuit diagrams and working of voltage to frequency converter and frequency to voltage converter? Thank you in advance

2. ### tshuck Well-Known Member

Oct 18, 2012
3,531
675
Look up the LM331 - the datasheet details how to use it in both configurations.

3. ### Dodgydave AAC Fanatic!

Jun 22, 2012
5,172
778
Lm2907 F to V chip.

4. ### Shabbir_Ahmed New Member

Feb 17, 2015
8
2
Hi
Voltage to frequency converter can also be called a voltage controlled oscillator.
or you can refer this link too for circuit diagrams..................http://circuitsplanet.blogspot.in/2015/02/voltage-controlled-oscillator.html
for FVC...................................................................................http://circuitsplanet.blogspot.in/2015/02/frequency-to-voltage-converter.html

5. ### ScottWang Moderator

Aug 23, 2012
4,936
777
I think you better talk some more what you want to do for that F to V then when the members give you the solution may easily to get to target.

6. ### JWHassler Member

Sep 25, 2013
205
34
I'm with him.... the frequency-range that you need will have a huge impact on the topology/effort required

7. ### Shabbir_Ahmed New Member

Feb 17, 2015
8
2
What range of frequency are you looking for?

8. ### ian field Distinguished Member

Oct 27, 2012
4,464
792
If you want dead simple - just use the 2-transistor astable multivibrator.

The 2 high value resistors that feed the transistor bases and form the R part of the CR timing networks usually go to Vcc in a fixed frequency implementation, You can also common those 2 resistors and take them to Vcc through a pot that can vary the frequency - or you can return the tops of those 2 resistors to a voltage that controls the frequency.

9. ### ian field Distinguished Member

Oct 27, 2012
4,464
792
The 331 is also equivalent to an RC145...something or other.

Sharp made a version. AFAICR; "331" fits into their longer part number.

These chips were all the rage in the early days of multisync VGA - I haven't checked whether any of them are still obtanium nowadays.