ADC using counter and opamps

Thread Starter


Joined Sep 21, 2005
Hi there,

I'm wondering if anyone could inform me how to build an ADC circuit that will convert an analog voltage between +3 and -3 volts into a 4 bit number?

I'm able to use a 4 bit counter, 4029, an op-amp summer circuit and comparator.

A little lost atm.

Thanks for any help.


Joined Sep 20, 2005
Well, first you have to shift the input to 0..6V, using opamp. then you use sexteen comparators to divide the signal into sixteen "levels". Then you use a "one_from_sixteen to binary converter". I don't know why would you use 4029. Its an up/down counter. If you have other questions, ask.