Oh, and here is another possible optimization.

By changing the sense resistor from 10 to 1 ohm it no longer needs to be a
2W resistor.

You just have to use 100k resistors from the ends of Rense to the op-amp
inputs instead of 1M resistors (I think) to maintain the same scaling.

Of course, now the extra power is going to be dissipated in the TIP41 and
its heatsink instead of  Rsense.

Bob Ammerman
RAm Systsems

----- Original Message -----
From: "Tom Messenger" <krist@THEGRID.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, April 18, 2002 5:02 PM
Subject: Re: [EE]: Olin's charger design


> The Ammerman current source was short lived.
>
> It is, indeed, the Howland current pump. I screwed that one up completely.
> My memory had it different so I finally looked it up. For anyone
> interested,  Horowitz & Hill, page 182 shows the traditional
configuration,
> which is what I remembered. Jung (IC op-amp cookbook), also page 182 shows
> it modified as Bob implemented it.
>
> None the less, it was a good observation on Bob A.'s part to see a way to
> apply it here.
>
> Best regards,
> Tom M.
>
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