frequency to voltage converter

[Matt]

is it possible to build a frequency to voltage converting that runs off
of 2 AA batteries.

 

[John Larkin]

is it possible to build a frequency to voltage converting that runs off
of 2 AA batteries.

Sure.

John

 

[martin griffith]

is it possible to build a frequency to voltage converting that runs off
of 2 AA batteries.

fully charged, or flat?


martin

 

[Matt]

ok. could u please post a chip part number. thanks

 

[John Popelish]

is it possible to build a frequency to voltage converting that runs off
of 2 AA batteries.

What frequency range and output voltage range?

 

[Matt]

What frequency range and output voltage range?

1400 - 3500 Hz and max output of 3 v

 

[ehsjr]

ok. could u please post a chip part number. thanks

2003

 

[linnix]

1400 - 3500 Hz and max output of 3 v

What current? I am sure you can find chips to do it. The cheapest way
I can think of is to use a $2 micro to switch/pump/charge a large
capacitor, based on the input (frequency) and output (voltage). You
can think of the micro as a feedback controller.

 

[John Larkin]

What current? I am sure you can find chips to do it. The cheapest way
I can think of is to use a $2 micro to switch/pump/charge a large
capacitor, based on the input (frequency) and output (voltage). You
can think of the micro as a feedback controller.

Or fire a one-shot, HC123 maybe, and lowpass filter its output.

John

 

[Rene Tschaggelar]

fully charged, or flat?

Actually, the batteries should be charged while measuring.


Rene