[sdiy] Learning about current sinks and sources

Stewart Pye stewpye at optusnet.com.au
Wed Mar 4 10:46:22 CET 2015


Hi Tom,

The Op Amp Cookbook is what I refer to for this. It becomes fairly 
obvious that all you need is ohms law and an understanding of op amps 
and transistors, once you see examples with descriptions...

Cheers,
Stew.


On 3/4/2015 2:33 AM, Tim Ressel wrote:
> Ic Op-Amp Cookbook by Walter G. Jung is another good source for this, and a wealth of op amp info in general.
>
> End of line
>   
> Tim Ressel
> Circuit Abbey
> 503-750-9331
> timr at circuitabbey.com
>
>
>
>
> ________________________________
> From: Tom Wiltshire <tom at electricdruid.net>
> To: synthdiy diy <Synth-diy at synth-diy.org>
> Sent: Tuesday, March 3, 2015 3:16 AM
> Subject: [sdiy] Learning about current sinks and sources
>
>
> Hi All,
>
> Can someone recommend a good site where I could learn about current sinks and sources?
>
> I've seen several different designs and derivations. Some are set up as sinks, some as sources, some inverting, some non-inverting, etc etc. It makes it hard to see what's going on.
>
> I'd like to be able to take an op-amp and a transistor (2N3904/2N3906) and design a sink/source for a particular job, so I need to know how to get the component values I need. For example, with a 0-5V input, how do I organise a 4-20mA output? (Just to choose an example which must have been done lots of times). For something more synthy, how about a 0-5V input and a 0-1mA current for the Ibias pin of a LM13700?
> Currently I can't answer questions like this myself, and I'd like to know how to.
>
> Thanks,
> Tom
>
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