Subject: Re: how to reduce noise from 555 timer...???
Date: Sun, 22 Dec 2002 13:20:46 +0800
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"ALG460" wrote in message
> >Nice part but the best components in the world will not help someone
> >with no concept of layout, placement, or separate AGND-DGND.
> It does sound like he's expecting too much from a crude, poorly laid out
> circuit but theres always time for someone to learn and ask questions. He
> not say what his application is here but for the life of me I cant figure
> why he needs such high gain for a strain gage. Gains in this range can be
I have only 1 strain gauge that removed from an old weighing machine, I can
affort to buy one as they cost me RM26/pcs (US$6.7/pcs) here in Malaysia,
hence, my sensitivity is poor, it can only output a 0.2mV with max load. I
only make use of 4-bits MSB of the ADC0801, bit-4,5,6 will act like a 3-bits
output will full scale of 2.5V, while bit-7 will act like a warning signal
of "overload". Instead I can use LSB to have similar feature that doesn'r
required such high gain, but the problem is, I try to show step-by-step what
going on with the circuit, so I place analog voltmeter to monitor the output
of the amplifier, the smallest scale of the voltmeter is 0~5VDC, using LSB
means I can't monitor it well......
> difficult to deal with for even the best designed and layed out circuits.
> I have used the AD7714 in many application and on a few did not pay much
> attention to layout and GND's but still achieved 14 - 16 bit performance
> awesome device like the 7714 can be a problem solver and make up for lack
> know how.