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From: Jim Thompson on 26 Jun 2010 14:23
On Sat, 26 Jun 2010 10:38:09 -0700,
"JosephKK"<quiettechblue(a)yahoo.com> wrote:

>On Thu, 24 Jun 2010 10:56:14 -0700 (PDT), panfilero <panfilero(a)gmail.com>
>wrote:
>
>>Thanks for the responses... what I'm trying to do is power an
>>accelerometer.... I'm trying to re-create the "Constant Current
>>Signal Conditioner" side of the circuit shown in Fig. 4 of this link
>>
>>http://www.pcb.com/techsupport/tech_signal.php
>>
>>but in that circuit they use a "Current Regulating Diode" I don't have
>>one of these, but I do have an electronics store down the street, so
>>basically that's what I'm trying to re-create, and for the
>>accelerometer I have, the current would have to be regulated to 4mA...
>>
>>thanks
>
>Since the absolute DC accuracy of constant current diodes (basically a
>jfet at IDss) is rather poor, but the effective impedance is really high
>i recommend a Wilson current mirror (positive side) circuit instead; much
>easier to get parts.

See...

http://analog-innovations.com/SED/EnhancedCurrentMirrors.pdf

I don't see anything about the OP's circuit that would require
absolute accuracy.

...Jim Thompson
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