Frequency-to-voltage converters?

Spasticteapot · 30th January 2010, 05:06 AM

I need a frequency-to-voltage (actually, frequency-to-current, but adding a FET is not so hard) converter for a theremin project. Can anyone recommend one?

Cro maniac · 30th January 2010, 05:27 AM

Lm2907 / lm2917

gmphadte · 5th February 2010, 03:56 AM

xr4151

star882 · 5th February 2010, 05:26 AM

Use a comparator to convert the input signal to a square wave of constant voltage, then use that signal to drive a charge pump.

stratus46 · 5th February 2010, 05:36 AM

Quote:

Originally Posted by star882

Use a comparator to convert the input signal to a square wave of constant voltage, then use that signal to drive a charge pump.

Which is done by taking your now constant amplitude pulses and triggering a monostable to create constant width pulses and integrating the pulse train. Max frequency is defined by the pulse width of the monostable.

G²

30th January 2010, 05:06 AM	#1
Spasticteapot diyAudio Member Join Date: Jan 2006 Location: Wisconsin....what did you expect?	Frequency-to-voltage converters? I need a frequency-to-voltage (actually, frequency-to-current, but adding a FET is not so hard) converter for a theremin project. Can anyone recommend one? __________________ I WANT TO BUY SOME W22EX001s. PM me if you have some for sale!

5th February 2010, 05:26 AM	#4
star882 diyAudio Member Join Date: Mar 2007	Use a comparator to convert the input signal to a square wave of constant voltage, then use that signal to drive a charge pump. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

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30th January 2010, 05:27 AM	#2
Cro maniac diyAudio Member Join Date: Feb 2004 Location: Zagreb, Croatia Blog Entries: 2	Lm2907 / lm2917

5th February 2010, 03:56 AM	#3
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	xr4151

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