Electronics Forum / Electronics

After my airconditioner failed the other day, and being reluctant to pay
a technician to come and fix it, I've been taking a look at its
electronics board.
It's clear that its power supply circuit has failed. From the board

I need to find an outfit who can punch some slots in ABS instrument cases (small
numbers) in Perth, but I'm not having any luck so far.  I'm sick of routing them
by hand.  Any suggestions would be appreciated.

I'm looking for a design (schematic etc.) of a 100W amplifier (more or a bit
less) that I can nonnect to a sinewavegenerator for a frequency range up to
30kHz. I want to use a piezo tweeter.
Please all the info you have is wecome!

http://home.graffiti.net/diverse:graffiti.net/miniscope9.jpg
Made for ultra portability fits in an 8x11x 2.5 inch case when the thyratron
and vibrator are removed from the chassis and stowed near the hinge. What
war time use was there for such a small 'scope, with in-the-field 12V ...

I have spent some time trying to work out what an 8032 does on cold start i.e.
are there cold/warm start vectors etc etc? The data sheets from Philips/Temic
etc don't seem to indicate.  Or do they simply start executing at 0000h?
(I've been asked to look into an 8032-based board ...

Bit of a long shot but I'll give it a go.
Does anyone happen to have an Audio Precision APIB PC Interface card lying
around they'd like to get rid of?
PCI, USB, PCMCIA or whatever.

As mentioned a few months back, something strange is going on with
Qantas planes and WA, and it's happening again:
http://www.news.com.au/perthnow/story/0,27574,24864822-2761,00.html
This is getting spooky.

I have two coax cables outdoors that are coupled by BNC. Is there some good
way to protect them from water and other weather elements? Tape and plastic
wrap doesn't seem to be the answer. It would be good to be able to open them
from time to time to check matters, so just ...

Hi, I've got a vintage Scope soldering iron, direct 240V connection (no
transformer, the cord goes straight into the iron). It dates from early
80s IIRC, and has given faithful service over all this time. No model
number marked so I can't provide it here, it has a red handle. ...

hi i have any number of 12 volt supplys to start with (as im sure we all
have ) i am looking for curcuit ideas for charging ni-cads something a
little smarter than a constant voltage reg 317 or whot ever
i see ebay have ballanced chargers for rc modles maybe somthing on these