RE: Heeeeeeeeelp!

["Paul" <groups@xxxxxxx>]

When I disconnect pin 1 (pin6 on the old part) (output) - it's at 10.5V -
i=
s this what you'd expect?

Paul.

> -----Original Message-----
> From: Dan [mailto:dtoma@xxxxxxx]
> Sent: 23 May 2003 21:11
> To: Paul
> Subject: Re: [ukha_d] Heeeeeeeeelp!
>=20
> Hi Paul,
>=20
> It seems to be a problem with the transistors.
> Disconnect pin 6 of the CI and check if then it is at 0V.
> If yes, then you must check the two transistors.
> Usually they must be pairs (the same beta factor and  the same
> characteristic in order to correctly balance the push-pull output. One
> good
> indication that something is wrong with them is that the resistance
> bewteen
> E-C is measurable (it must be allmost infinite if the base is not
> connected).
>=20
>=20
> BR,
> Dan
> ----- Original Message -----
> From: "Paul" <paul@xxxxxxx>
> To: "Dan" <dtoma@xxxxxxx>
> Sent: Friday, May 23, 2003 10:55 PM
> Subject: RE: [ukha_d] Heeeeeeeeelp!
>=20
>=20
> > Oh, and I'm not sure what you mean by " check if one of the
R6 or R7
> resistors is not interrupted"?
> >
> > Paul.
> >
> > > -----Original Message-----
> > > From: Dan [mailto:dtoma@xxxxxxx]
> > > Sent: 23 May 2003 19:40
> > > To: ukha_d@xxxxxxx
> > > Subject: Re: [ukha_d] Heeeeeeeeelp!
> > >
> > > 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 +11.4=
V
> > > 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.
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