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Re: Heeeeeeeeelp! - got somewhere!
Hi Paul
Sorry i cant help you here as i have done very little av
stuff..Keith is the man for this one..Keith got any Kat5 modules that
would
do the job??
Frank
----- Original Message -----
From: "Paul" <groups@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Saturday, May 24, 2003 7:35 AM
Subject: RE: [ukha_d] Heeeeeeeeelp! - got somewhere!
Got a picture but it's quite 'grey' and needs to be brighter. How much of
this might be down to long lead lengths (as it's on breadboard)? The
capacitors between the power supply pins of the op amp and GND are close to
the IC but have quite long leads to GND - would this make a difference?
As to shielding of the incoming/outgoing signal cables - should they be
connected to AC GND or the common of the PSU?
Should they also be shielded as close to the PCB as possible?
Ta,
Paul.
> -----Original Message-----
> From: Frank Mc Alinden [mailto:fmcalind@xxxxxxx]
> Sent: 23 May 2003 22:20
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Heeeeeeeeelp! - got somewhere!
>
> Hi Paul
> What exactly are you making ?? sounds interesting.. (nosey
> frank) ;-))
>
> Frank
> ----- Original Message -----
> From: "Paul" <groups@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Saturday, May 24, 2003 7:17 AM
> Subject: RE: [ukha_d] Heeeeeeeeelp! - got somewhere!
>
>
> Ahhh - I did have one of the transistors connected wrong - the
datasheet
> from 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
-
> 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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