how to conver frequence into voltge ???

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ZengLei

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I need to conver frequence into voltage linearly,and i don't want to use any ICs,just build the circuit with OP,BJT~~~~~~~,any iders for me ???

Thanks~~~~~~~~~~~
 

Here:
**broken link removed**
you will find an example of simple F-to-V converter based on so called "transistor pump" .. see picture below ..

Regards,
IanP

Performance
Minimum input for reliable operation: 0.7V (pk-pk) or 0.25V rms, measured at 50 kHz.

The ouput voltage is linearly related to input frequency from 200 Hz to over 800 kHz with a slope of 5.15 Volts/MHz
Click to expand...
 

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    ZengLei

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I really supprise why you do not want to build the circuit by ICs instead of discretes. IanP discrete's circuit is nice in the past but it is very difficult for people when adjusting and tuning, calibrating the circuit while the specs is fairly limited. I do not think that this kind of circuit can save you money for parts either.

nguyennam
 

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