Hi, can I know where to get a analogue adder circuit thanks.
Analogue adder circuit
Jan 17, 2007
7 Replies
On a sunny day (17 Jan 2007 06:39:44 -0800) it happened snipped-for-privacy@gmail.com wrote in :
2 resistors.Jan Panteltje a écrit :
That one will also divide by 2 for free.
If the OP really wants an adder he'll need one opamp and 2 Rs more.
Thanks,
Fred.
On a sunny day (Wed, 17 Jan 2007 16:28:09 +0100) it happened Fred Bartoli wrote in :
Depends, if he feeds the 2 R into a low impedance point he adds current just fine without dividing. It is all ration and error allowed.
1M and 1M into your uA meter (1k impedance perhaps) adds with .1% error.
IN+ to GND, the 2 Rs from input sources to IN-, one more R from there to OUT. Saves 1 R or about $0.008 fully burdened :-)
Ok, it also inverts.
SCNR, Joerg
http://www.analogconsultants.com
I bet you build your instrumentation amplifiers using the two op-amp approach rather than the better-known three op-amp approach too, right? :-)
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Nope, with the two-transistors-glued-together approach :-)))
Regards, Joerg
http://www.analogconsultants.com
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