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Re: Heeeeeeeeelp! - got somewhere!
Hi Paul,
I'm glad that I can help.
Good luck,
Dan
----- Original Message -----
From: "Paul" <groups@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Saturday, May 24, 2003 12:17 AM
Subject: RE: [ukha_d] Heeeeeeeeelp! - got somewhere!
> Ahhh - I did have one of the transistors connected wrong - the
datasheet
>from
>
> 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
-
will 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!
> >
> > When I disconnect pin 1 (pin6 on the old part) (output) - it's at
10.5V -
> > is 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!
> > >
> > > 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
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.
> > > > > > > >
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