[sdiy] Learning about current sinks and sources

[Neil Johnson]

Hi Tom,

Start with Malvino's Electronics Principles.  That covers the general
area of electronics with transistors and op-amps.  What you are asking
about is one specific application, and to understand that you really
need an understanding of the fundamentals.

Being a textbook used copies can be had for very little these days.

Neil

On 3 March 2015 at 11:16, Tom Wiltshire <tom at electricdruid.net> wrote:
> 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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