[time-nuts] DAC resistors
J. Forster
jfor at quik.com
Tue Oct 6 23:09:27 UTC 2009
Or a binary counter and binary to BCD driver chips.
-John
============
>> I am constructing a phase meter to monitor the phase creep of clocks.
>> It consists of a BCD counter counting say microseconds that has its
>> count strobed into a latch by a pulse from the clock. The Latch drives
>> a DAC which drives a pen recorder and an analogue data logger. Now I
>> am familiar with R - 2R networks, and that method is used on each
>> decade but the resistors that combine the decades in a 10:1 ratio are
>> the problem. ...
>
> Why are you using a BCD counter?
>
> If you want it to drive a display, consider adding a binary counter in
> parallel with the BCD counter.
>
>
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