[Date Prev][Date
Next][Thread Prev][Thread Next][Date
Index][Thread Index]
Re: Heeeeeeeeelp!
Do not forget that this type of circuit must have a correct load at the
output in order to be well balanced.
Dan
----- Original Message -----
From: "Paul" <groups@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, May 23, 2003 11:01 PM
Subject: RE: [ukha_d] Heeeeeeeeelp!
> Thanks very much Dan.
>
> Polarity of diodes is OK I think (D1 black band connected to output of
IC1
[pin 1 from the datasheet] D2 black band connected to base of Q2). D1
voltage = 0.6V, D2 voltage = 0.97V
>
> IC1 - pin 1 (output) = -0.1V
> Pin 2 (-) = -0.05V
> Pin 3 (+) = 0V dead on
>
> Output of circuit = -0.5V
>
> IC1 and both transistors get very hot quite quickly (5 sec or so)
>
> I did have one of the transistors connected the wrong way around (I
think)
initially when I very first turned it on - I think they are OK now though
but to check - Q1 (BC182L) pin1 = E, pin2 = C, pin3 = B (TO-92 package) -
Q2
(BC212) pin1 = C, pin2 = B, pin3 = E. This info I got from the datasheets.
Is the difference in C-B-E assignment between the two correct?
>
> Could I have damaged either the transistors or IC - is it worth
swapping
for new ones (or could I damage them if the circuit is still wrong?).
>
> Keith Doxey recommended the substitution of the CA3100 for the
EL2244C. I
have the datasheets if that helps?
>
> Many thanks for your help!!!
>
> 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.
> > > > >
> > > > > 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/
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> > ** 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/
>
>
>
>
Home |
Main Index |
Thread Index
|