RE: Heeeeeeeeelp!

["Paul" <groups@xxxxxxx>]

Thanks very much Dan.

Polarity of diodes is OK I think (D1 black band connected to output of IC1
=
[pin 1 from the datasheet] D2 black band connected to base of Q2). D1
volta=
ge =3D 0.6V, D2 voltage =3D 0.97V

IC1 - pin 1 (output) =3D -0.1V
Pin 2 (-) =3D -0.05V
Pin 3 (+) =3D 0V dead on

Output of circuit =3D -0.5V

IC1 and both transistors get very hot quite quickly (5 sec or so)

I did have one of the transistors connected the wrong way around (I think)
=
initially when I very first turned it on - I think they are OK now though
b=
ut to check - Q1 (BC182L) pin1 =3D E, pin2 =3D C, pin3 =3D B (TO-92
package=
) - Q2 (BC212) pin1 =3D C, pin2 =3D B, pin3 =3D E. This info I got from
the=
datasheets. Is the difference in C-B-E assignment between the two correct?

Could I have damaged either the transistors or IC - is it worth swapping
fo=
r new ones (or could I damage them if the circuit is still wrong?).

Keith Doxey recommended the substitution of the CA3100 for the EL2244C. I
h=
ave the datasheets if that helps?

Many thanks for your help!!!

Paul.

> -----Original Message-----
> From: Dan [mailto:dtoma@xxxxxxx]
> Sent: 23 May 2003 19:40
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Heeeeeeeeelp!
>=20
> Hi Paul,
>=20
> 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
aroun=
d
> 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.
>=20
> I don't know EL2244C... you're sure that it is compatible with CA3100
?
> The rest of the substitutions are not important.
>=20
> BR,
> Dan
>=20
> ----- Original Message -----
> From: "Paul" <groups@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Friday, May 23, 2003 8:39 PM
> Subject: RE: [ukha_d] Heeeeeeeeelp!
>=20
>=20
> > 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 =96 I need help
(please!)
> > > >
> > > > My transistors are cooking!
> > > >
> > > > Anyone?
> > > >
> > > > Paul.
> > > >
> > > >
> > > >
> > > > ** UKHA2004 BE THERE! ** - start planning now.
> > > >
> > > > http://www.automatedhome.co.uk
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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
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> >
> >
> >
> > ** UKHA2004 BE THERE! ** - start planning now.
> >
> > http://www.automatedhome.co.uk
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>=20
>=20
>=20
>=20
> ** UKHA2004 BE THERE! ** - start planning now.
>=20
> http://www.automatedhome.co.uk
> Post message: ukha_d@xxxxxxx
> Subscribe:  ukha_d-subscribe@xxxxxxx
> Unsubscribe:  ukha_d-unsubscribe@xxxxxxx
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