Re: Motor Control Circuit Problem

From: Clarence (no_at_No.com)
Date: 10/29/04 

Date: Fri, 29 Oct 2004 20:21:12 GMT

"Terry Pinnell" <terrypinDELETE@THESEdial.pipex.com> wrote in message
news:1285o09qi313ndsoc47sgvr4qfuj88uafl@4ax.com...
> "Helmut Sennewald" <helmutsennewald@t-online.de> wrote:
>
>
> >Hello Terry,
> >you don't need another simulator, instead you need a correct
> >circuit diagram. Your circuit will never work as intended.
> >
> >Let's look for example to Q4 and Q3 where the (base-)current flows.
> >It flows from
> >+9V -> Emitter Q4 -> Base Q3 -> Emitter Q3
> >regardless you drive any base current by Q1.
> >This is a short from +9V to ground by 2 Vbe-diodes.
> >
> >From where do you have this wrong circuit diagram?
> >
> >Best Regards,
> >Helmut
>
> Thanks Helmut, but I realise the circuit is fatally flawed! I still
> wanted to be able to see exactly what happens on applying power to it,
> for each of the 4 possible input conditions.
>
> The circuit is at
> http://www.electronic-circuits-diagrams.com/motorimages/motorckt4.shtml
>
> and the original thread discussing it is here:
> Subject: Motor Control Circuit Problem
> Date: 28 Oct 2004 15:48:41 -0700
> Message-ID: <1099003721.067016.22050@c13g2000cwb.googlegroups.com>
>

You may get some operation by inserting a low value resistor in each emitter
lead. That would give a indication without any calculation being infinite.

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