[Date Prev][Date
Next][Thread Prev][Thread Next][Date
Index][Thread Index]
RE: Heeeeeeeeelp! - got somewhere!
- To: <ukha_d@xxxxxxx>
- Subject: RE: Heeeeeeeeelp! - got somewhere!
- From: "Paul" <groups@xxxxxxx>
- Date: Fri, 23 May 2003 22:35:08 +0100
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
Got a picture but it's quite 'grey' and needs to be brighter. How much of
t=
his might be down to long lead lengths (as it's on breadboard)? The
capacit=
ors 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
con=
nected 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!
>=20
> Hi Paul
> What exactly are you making ?? sounds interesting.. (nosey
> frank) ;-))
>=20
> 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!
>=20
>=20
> Ahhh - I did have one of the transistors connected wrong - the
datasheet
> from RS was the wrong one!
>=20
> Now I need to fine tune the output which is a bit odd brightness and
> colour
> wise.
>=20
> I've got a tant cap on the input side and a 5K trimmer instead of 2K5
-
> will
> this make a difference?
>=20
> Thanks Keith and Dan!!!
>=20
> Paul.
>=20
> > -----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. On=
e
> > > 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 R=
7
> > > 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
=96 I need help (please!=
)
> > > > > > > >
> > > > > > > > My transistors are cooking!
> > > > > > > >
> > > > > > > > Anyone?
> > > > > > > >
> > > > > > > > Paul.
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > ** UKHA2004 BE THERE! ** - start
planning now.
> > > > > > > >
> > > > > > > > http://www.automatedhome.co.uk
> > > > > > > > Post message: ukha_d@xxxxxxx
> > > > > > > > Subscribe:
ukha_d-subscribe@xxxxxxx
> > > > > > > > Unsubscribe:
ukha_d-unsubscribe@xxxxxxx
> > > > > > > > List owner: ukha_d-owner@xxxxxxx
> > > > > > > >
> > > > > > > > Your use of Yahoo! Groups is
subject to
> > > > > > > http://docs.yahoo.com/info/terms/
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > ** UKHA2004 BE THERE! ** - start
planning now.
> > > > > > >
> > > > > > > http://www.automatedhome.co.uk
> > > > > > > Post message: ukha_d@xxxxxxx
> > > > > > > Subscribe: ukha_d-subscribe@xxxxxxx
> > > > > > > Unsubscribe: ukha_d-unsubscribe@xxxxxxx
> > > > > > > List owner: ukha_d-owner@xxxxxxx
> > > > > > >
> > > > > > > Your use of Yahoo! Groups is subject to
> > > > > http://docs.yahoo.com/info/terms/
> > > > > >
> > > > > >
> > > > > >
> > > > > > ** UKHA2004 BE THERE! ** - start planning
now.
> > > > > >
> > > > > > http://www.automatedhome.co.uk
> > > > > > Post message: ukha_d@xxxxxxx
> > > > > > Subscribe: ukha_d-subscribe@xxxxxxx
> > > > > > Unsubscribe: ukha_d-unsubscribe@xxxxxxx
> > > > > > List owner: ukha_d-owner@xxxxxxx
> > > > > >
> > > > > > Your use of Yahoo! Groups is subject to
> > > > > http://docs.yahoo.com/info/terms/
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > > ------------------------ Yahoo! Groups Sponsor
------------------=
-
> --
> > ~-
> > > ->
> > > > > Get A Free Psychic Reading! Your Online Answer To
Life's Importan=
t
> > > > > Questions.
> > > > > http://us.click.yahoo.com/Lj3uPC/Me7FAA/uetFAA/IBOolB/TM
> > > > >
-----------------------------------------------------------------=
-
> --
> > -
> > > ~->
> > > > >
> > > > > ** UKHA2004 BE THERE! ** - start planning now.
> > > > >
> > > > > http://www.automatedhome.co.uk
> > > > > Post message: ukha_d@xxxxxxx
> > > > > Subscribe: ukha_d-subscribe@xxxxxxx
> > > > > Unsubscribe: ukha_d-unsubscribe@xxxxxxx
> > > > > List owner: ukha_d-owner@xxxxxxx
> > > > >
> > > > > Your use of Yahoo! Groups is subject to
> > > http://docs.yahoo.com/info/terms/
> > > >
> > > >
> >
> >
> >
> > ** UKHA2004 BE THERE! ** - start planning now.
> >
> > http://www.automatedhome.co.uk
> > Post message: ukha_d@xxxxxxx
> > Subscribe: ukha_d-subscribe@xxxxxxx
> > Unsubscribe: ukha_d-unsubscribe@xxxxxxx
> > List owner: ukha_d-owner@xxxxxxx
> >
> > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>=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
> List owner: ukha_d-owner@xxxxxxx
>=20
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>=20
>=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
> List owner: ukha_d-owner@xxxxxxx
>=20
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
Home |
Main Index |
Thread Index
|