Electronics Forum / Repair / June 2007

Got a bit tired of electronics and as my old hand drill, i only use for
counter-clockwise left-hand drilling, is playing up so I decided to give it
a birthday present of a new coil. It was supposed to be for 240V but running
off 110V via a variac was ok for my purposes, but now the ...

Anyone else come across this a local person has his combo amp speaker pack
up on him. UK manufacture and inside warranty but quoted by the company at
least 10 days to repair and he would have to pay one way courier cost of a
30Kg lump. Maybe they would have refunded that but his ...

Are you seeking for a long-term honest partner for business?
 We are in CHINA. We are a trustworthy wholesaler who sells LAPTOP,
PLASMA TV, LCD TV, CELL PHONE, DIGITAL CAMERA, PDA.GPS.PSP, etc.
 As all of our products were come from the manufacturer directly, the

Well, hi once again.  It's been about eight years since my last post
to this group.  The old mail browser I'd been using got overloaded,
and I got wound up with real life, sort of.  But it was only
temporary, and now I have a problem of my own.

i have a couple of broken cassette decks.  one with dbx, one with hx
pro.  was wanting to experiment with tapping into both the dbx and hx
pro circuits (in/out), making them independent processing units.  i
would like to use these on other tape based recorders that don't have

The above radio went black but continued to play.  When we tried to
change the sound level or the station, the controls didn't  work.  I
checked both fuses and they were ok.  The radio turns on with the
ignition and plays on that one channel.  Is this fixable at a

I have an old AA-1200 receiver that works intermittently.  When it
cuts out I can detect a relay on the circuit board changing states.  I
assume some protection circuit has detected an unsafe condition and
shut it down.  My problem is I have no information on the unit.  Can

Hello all...
Okay, I've got this 1984 Plymouth Reliant in fair shape on the exterior and
reasonably good on the interior. It has an AM radio that generally works,
but there are some problems. I already asked on the

For your consideration, Four Heath/Zenith regulated HV power supplies:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=140129606492
Thanks.

Hello:  Upon removing the case from my 2246 scope, the case snagged on
the heat sink of one of the transistors in the "VO Gain" section of
the main PC board (not the processor board), breaking the leads of
this transistor.  The transistor is a round metallic 3-lead transistor

How come plasma service manuals come without a power supply and syscon
schematic ? I paid 25 US$ and i'm told manufacturers never publish PS
schematics in the service manual. Incidentally the TV i'm trying to
fix is a Hitachi 42PD7800TA Plasma display panel. The ps is made by

I'm fixing up an old light beam activated rifle gallery and want to
convert some IR Laser diode Colt-45 style pistols to a white light LED
or possibly tiny photo-flash tube.
The targets all work on visible light and use CDS cells (are these

Ok, So I got home today from class and my brothers tell me that my
youngest brother had splashed some water into the outlet when he
washed his hands at the sink.   Next there was a grinding sound, kind
of like a garbage disposal...but no puff of smoke.

Someone know where I can buy this obsolete component? Or someone know
another new component that I can use?
Thanks a lot
Davide

I know this should be simple but isn't.  I need to resolder a DC power
connector on a laptop, due to dry joints.
I can't find my old, rarely used soldering iron, so I went to Maplin and
bought their cheapo 30W soldering iron.