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RE: Heeeeeeeeelp! - got somewhere!
- To: <ukha_d@xxxxxxx>
- Subject: RE: Heeeeeeeeelp! - got somewhere!
- From: "Paul" <groups@xxxxxxx>
- Date: Fri, 23 May 2003 22:17:23 +0100
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
Ahhh - I did have one of the transistors connected wrong - the datasheet
fr=
om RS was the wrong one!
Now I need to fine tune the output which is a bit odd brightness and
colour=
wise.
I've got a tant cap on the input side and a 5K trimmer instead of 2K5 -
wil=
l this make a difference?
Thanks Keith and Dan!!!
Paul.
> -----Original Message-----
> From: Paul [mailto:groups@xxxxxxx]
> Sent: 23 May 2003 21:34
> To: Dan
> Cc: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Heeeeeeeeelp!
>=20
> When I disconnect pin 1 (pin6 on the old part) (output) - it's at
10.5V -
> is this what you'd expect?
>=20
> Paul.
>=20
> > -----Original Message-----
> > From: Dan [mailto:dtoma@xxxxxxx]
> > Sent: 23 May 2003 21:11
> > To: Paul
> > Subject: Re: [ukha_d] Heeeeeeeeelp!
> >
> > Hi Paul,
> >
> > 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).
> >
> >
> > 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!
> >
> >
> > > 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
> +11.4V
> > > > and -12V is actually -11.04V).
> > > > >
> > > > > When I connect up the circuit, it doesn't work and
the transistor=
s
> > 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.
> > > > > >
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>=20
>=20
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> ** UKHA2004 BE THERE! ** - start planning now.
>=20
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