voltage to frequency converter?

[fabienduarte]

hi
i need help trying to make a voltage to frequency converter out of just 741 opamps and npn tranisitors. i need to convert 1 volt to 1khz square or triangle wave.
example,
1volt = 1khz
2 volt=2khz
1.5volts=1.5khz

thanks for your help

 

[Russlk]

Use the LM2917 circuit:
The hash filter is only needed in an automotive application.

 

[fabienduarte]

thanks for the reply
but i need to build it out of lm741 op-amps and maybe a few transistors

 

[Russlk]

Get the National Semiconductor application note AN162, it shows how they make the frequency to voltage converter.

 

[Nigel Goodwin]

Get the National Semiconductor application note AN162, it shows how they make the frequency to voltage converter.

The title of this thread is 'Voltage to frequency converter', presumably a VCO (voltage controlled oscillator).

 

[Russlk]

Oh, right! My dislexia!