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From: John Larkin on 18 Sep 2009 13:41
On Fri, 18 Sep 2009 12:39:56 -0400, Steve <steve(a)nomail.net> wrote:

>I should have mentioned that more than one range is fine. I do need
>to generate 0.5 microamps accurately.
>
>EDN has a Design Idea from 5/14/09 showing transistors for higher
>current. with some errors in connections of IC2
>http://www.edn.com/article/CA6656306.html?talk_back_header_id=6598899#talkback


Fig 2 is insane. It must be drawn wrong. Most EDN "design idea"
schematics are.


John


From: Jim Thompson on 18 Sep 2009 13:49
On Fri, 18 Sep 2009 10:41:36 -0700, John Larkin
<jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote:

>On Fri, 18 Sep 2009 12:39:56 -0400, Steve <steve(a)nomail.net> wrote:
>
>>I should have mentioned that more than one range is fine. I do need
>>to generate 0.5 microamps accurately.
>>
>>EDN has a Design Idea from 5/14/09 showing transistors for higher
>>current. with some errors in connections of IC2
>>http://www.edn.com/article/CA6656306.html?talk_back_header_id=6598899#talkback
>
>
>Fig 2 is insane. It must be drawn wrong. Most EDN "design idea"
>schematics are.
>
>
>John
>

Nowadays EDN is so short of contributors that most "designs" come from
third world countries ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

The health bill from Obama and the Democrats is so full of subter-
fuge and obfuscation that we are forced to judge it solely by the
smell... Ewwwwwwh! Stinks of mendacity and unwashed weenies :-(
From: Spehro Pefhany on 18 Sep 2009 14:16
On Fri, 18 Sep 2009 10:41:36 -0700, John Larkin
<jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote:

>On Fri, 18 Sep 2009 12:39:56 -0400, Steve <steve(a)nomail.net> wrote:
>
>>I should have mentioned that more than one range is fine. I do need
>>to generate 0.5 microamps accurately.
>>
>>EDN has a Design Idea from 5/14/09 showing transistors for higher
>>current. with some errors in connections of IC2
>>http://www.edn.com/article/CA6656306.html?talk_back_header_id=6598899#talkback
>
>
>Fig 2 is insane. It must be drawn wrong. Most EDN "design idea"
>schematics are.
>
>
>John

The inputs of IC2 are obviously supposed to connect across "RL".

It's perhaps of some interest because it is bipolar.

I do wonder how stable it is..

From: Spehro Pefhany on 18 Sep 2009 14:17
On Fri, 18 Sep 2009 10:49:12 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote:

>On Fri, 18 Sep 2009 10:41:36 -0700, John Larkin
><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote:
>
>>On Fri, 18 Sep 2009 12:39:56 -0400, Steve <steve(a)nomail.net> wrote:
>>
>>>I should have mentioned that more than one range is fine. I do need
>>>to generate 0.5 microamps accurately.
>>>
>>>EDN has a Design Idea from 5/14/09 showing transistors for higher
>>>current. with some errors in connections of IC2
>>>http://www.edn.com/article/CA6656306.html?talk_back_header_id=6598899#talkback
>>
>>
>>Fig 2 is insane. It must be drawn wrong. Most EDN "design idea"
>>schematics are.
>>
>>
>>John
>>
>
>Nowadays EDN is so short of contributors that most "designs" come from
>third world countries ;-)
>
> ...Jim Thompson

These days you don't have to flip through a lot of ads to get to the
Design Ideas..

I wonder how many employees they can support per page of advertising.

From: John Larkin on 18 Sep 2009 15:21
On Fri, 18 Sep 2009 14:16:02 -0400, Spehro Pefhany
<speffSNIP(a)interlogDOTyou.knowwhat> wrote:

>On Fri, 18 Sep 2009 10:41:36 -0700, John Larkin
><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote:
>
>>On Fri, 18 Sep 2009 12:39:56 -0400, Steve <steve(a)nomail.net> wrote:
>>
>>>I should have mentioned that more than one range is fine. I do need
>>>to generate 0.5 microamps accurately.
>>>
>>>EDN has a Design Idea from 5/14/09 showing transistors for higher
>>>current. with some errors in connections of IC2
>>>http://www.edn.com/article/CA6656306.html?talk_back_header_id=6598899#talkback
>>
>>
>>Fig 2 is insane. It must be drawn wrong. Most EDN "design idea"
>>schematics are.
>>
>>
>>John
>
>The inputs of IC2 are obviously supposed to connect across "RL".
>
>It's perhaps of some interest because it is bipolar.
>
>I do wonder how stable it is..

In addition to the overall loop getting schitzoid, I'd be concerned
about the complementary transistors having delusions of being RF
oscillators.

John

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