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From: firstname.lastname@example.org (tom)
Subject: Re: how to reduce noise from 555 timer...???
Date: 9 Jan 2003 03:59:13 -0800
NNTP-Posting-Date: 9 Jan 2003 11:59:13 GMT
what might be an even more appropiate adc than the ad7714 for a
weightscale design is the ad7730 which is optomized for weight scale
See http://www.analog.com/ for more details.
email@example.com (ALG460) wrote in message news:<firstname.lastname@example.org>...
> What is the mV output of your strain gage? Why do you need such a high gain?
> Such high gains make it difficult to tame noise, drift and thermal effects. If
> your design/time permits you might want to try switching to a sigma delta
> converter such as the analog devices AD7714. These can be directly connected to
> strain gages and have built in PGA amplifiers, filters, auto calibration and
> shift registers. They are somewhat complex to use but offer high performance
> and inherent noise rejection.
> If you suspect, as the previous poster mentioned, the 555 is causing the
> problem try adding a small resistance in series with the supply line to the
> 555. This could minimize any switching spikes and at 3hz is unlikely to make
> much difference to your circuit as far as rise times. Or try a different
> oscillator circuit all together such as a simple cmos inverter (74C14).
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