Electronics Forum / Basics / November 2004

I would like an isolation transformer (1:1) for the UK mains.  I can't seem
to find any off the shelf designs though.  If I bought 2 of the same step
down transformers (i.e. 240V to 12V) I could take them apart and build a new
transformer, which consisted of the 2 primary coils.  ...

Anyone know?
tnx,
steve

Is there any pic microcontroller or any other that has a wireless
transciever build or that I could easily add the tx & rx module to it?
thanks in advance.
-hash

Hi,  
I'm not up with modern electronics & I'm struggling a bit with this: if
anyone can give me any advice or suggestions I'd be grateful
I have a device with an open collector output which can be controlled ON/OFF

hi i need help in making a bell /buuzzer board, the kind of thing that is used
on t.v panel games where the quickest on the bell/buzzer lights their light and
gets to answer the question. i hope someone out there can help

I am using a pair of these as the output stage in my dual pulse generator
discussed
in several recent threads. When breadboarded, it worked. If I connected a
10k

Should Richard Steve Walz be:
a)  Roaming Newsgroups seeking anyone he may devour (over 20,000 posts since
1992)!  
b)  In a mental hospital of somekind

How are the LEDS wired . In Paarrel o in series. the reason I ask is
becaues I was wondering if I were to cut a few off the end would it
cause some grief(a blown fuse in the fuse box) or would the remaining
leds be a little brighter.

I own a four channel mixer that runs off a 9v battery. The unit itself did
not come with a plug pack but it has the option for a 9v 100mA plug pack. My
problem is that I can't seem to get my hands on a 100mA. I've checked out
Jaycar. http://www.jaycar.com.au as I'm in Aus and Dick ...

Should Richard Steve Walz be:
a)  Roaming Newsgroups seeking anyone he may devour (over 20,000 posts since
1992)!  
b)  In a mental hospital of somekind

Where can I find fabrication details for quatratran(quasiparticle
trapping transistor), a superconducting device.

I have a simple circuit for a time delay. Small problem is that it does not
switch entirely as I want.
With a transistor I fill an elco of 100uF and then switch off that
transistor. The voltage on the elco is used to switch on a second

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 I  |      |
    C      R
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My father asked me a question recently for which I had no good answer. Here
was the problem he described:
"we had a thunderstorm and before I got to my computer to shut it down a
lightening bolt killed my electricity for just a second. Everything came

Does anyone know of a web site, or a simple way of getting the right caps to
add up to the number I want.
Heres what I need.
I want a .39u Cap I went to the store but they said they don't have it, its