Re: Heeeeeeeeelp!

["Dan" <dtoma@xxxxxxx>]

Hi Paul,

Check the following points:
- IC1-pin 2, 3 and 6 to be as near as 0V as possible (without any input
signal)
- direct voltage on each of the two diodes(D1 and D2)... it must be around
0.6V
- check if one of the R6 or R7 resistors is not interupted
- check the polarity of the two diodes.
If something different, send me a mail.

I don't know EL2244C... you're sure that it is compatible with CA3100 ?
The rest of the substitutions are not important.

BR,
Dan

----- Original Message -----
From: "Paul" <groups@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, May 23, 2003 8:39 PM
Subject: RE: [ukha_d] Heeeeeeeeelp!


> I'm building the following circuit:
>
> http://home.maine.rr.com/randylinscott/jan98.htm
>
> But with the following substitutions:
>
> IC1 CA3100 (single opamp) changed to EL2244C (dual opamp package)
> Q1 2N3053 (Gen purpose NPN transistor) changed to BC182L
> Q2 2N4037 (Gen purpose PNP transistor) changed to BC212
> D1 1N914 (small signal Diode) changed to 1N4148
>
> R3 is a 5K trimmer rather than 2K5 specified (is this a problem?)
>
> I'm using an ATX PC PSU as the +12V and -12V source with the common
connection connected to the ground points on the circuit (is this right?).
The PSU has slightly different voltages (+12V is something like +11.4V
and -12V is actually -11.04V).
>
> When I connect up the circuit, it doesn't work and the transistors and
IC
get very hot!
>
> I'm treble checking the circuit. Any thoughts?
>
> Thanks,
>
> Paul.
>
> > -----Original Message-----
> > From: Dan [mailto:dtoma@xxxxxxx]
> > Sent: 23 May 2003 18:14
> > To: ukha_d@xxxxxxx
> > Subject: Re: [ukha_d] Heeeeeeeeelp!
> >
> > Hi Paul,
> >
> > Transistor from what???
> > Or ...just a simple transistor?
> > :-)
> > Dan
> > ----- Original Message -----
> > From: "Paul" <groups@xxxxxxx>
> > To: <ukha_d@xxxxxxx>
> > Sent: Friday, May 23, 2003 7:46 PM
> > Subject: [ukha_d] Heeeeeeeeelp!
> >
> >
> > > Anyone with electronics experience – I need help
(please!)
> > >
> > > My transistors are cooking!
> > >
> > > Anyone?
> > >
> > > Paul.
> > >
> > >
> > >
> > > ** UKHA2004 BE THERE! ** - start planning now.
> > >
> > > http://www.automatedhome.co.uk
> > > Post message: ukha_d@xxxxxxx
> > > Subscribe:  ukha_d-subscribe@xxxxxxx
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> > > List owner:  ukha_d-owner@xxxxxxx
> > >
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> > >
> > >
> > >
> > >
> >
> >
> >
> >
> > ** UKHA2004 BE THERE! ** - start planning now.
> >
> > http://www.automatedhome.co.uk
> > Post message: ukha_d@xxxxxxx
> > Subscribe:  ukha_d-subscribe@xxxxxxx
> > Unsubscribe:  ukha_d-unsubscribe@xxxxxxx
> > List owner:  ukha_d-owner@xxxxxxx
> >
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http://docs.yahoo.com/info/terms/
>
>
>
> ** UKHA2004 BE THERE! ** - start planning now.
>
> http://www.automatedhome.co.uk
> Post message: ukha_d@xxxxxxx
> Subscribe:  ukha_d-subscribe@xxxxxxx
> Unsubscribe:  ukha_d-unsubscribe@xxxxxxx
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