Electronics Forum / Electronics / October 2005

** Just went to find the link for Bob Parker's ESR meter.
    It's vanished.
    ???????????
...........  Phil

I recently picked up an old Roland synthesizer, some of the linear pots
are "grinding" when I move them - can they be lubricated/cleaned/buffed
up with something?
Thanks,

I went to visit a client today and the topic of my cell 'phone which fell
into the toilet (before I used it) came up. I quickly picked it up and
unzipped the pleather case, removed the battery and rinsed the blue water
from the 'phone. Then I put it on a fluoro light fixture to ...

Looking for a simple current sensing circuit...
is this one ok? http://mywebpages.comcast.net/khartnett232402/circuit.htm
or is there better ones?

Anyone know of a cheap but easy way to cut blank fibreglass PCB's to size?
Previously I have been using a very sharp cutting knife and steel ruler
(very timely task!).  Is there such tool out there that isn't massive and
doesn't cost the Earth that can do this?  Has anyone tried ...

I'm studying an MEng Electronic Engineering degree at the University of
Warwick in the UK and outside of electronics my main passion is music
(I play guitar, double bass and recently taken to piano). As I have
recently started thinking about what i'm going to do after uni I

I want to make 4 LED's light up in the following sequence (looping):
O O _ _
_ O O _
_ _ O O

Folks,
I have a two tube fluro light.  Each tube is 18 watts.
The tubes are old and are the small length and smaller diamater ones.
I bought a couple of these solid state starters from Jaycar, but I

Greetings to all,
First of all, I hope I'm on topic on this group. I would need a machine
similar to this: http://www.conrad.cz/detailpage.asp?DPG=50756. However,
as I see, it is rather costly (almost 900$ here, i presume it is not much

need help with iding a transistor out of a surround sound receiver.
the markings on it are as such:
115-
8 XE

I have a very nice Marconi 2955A but has a couple of damaged Philips
OM345 amplifiers... I wonder if you could help me locating a source for
them.
Another possibility is use a Mini-Circuits MMIC. I have read that a

No dry joints, no puffy caps.
I am waiting on some elctros to arrive for replacing arounf horizontal.....
any tips anyone?

hmmm...
Trying to solve this problem for a long time But I dont seem to have
enough knowledge to do so :( Ok...I have a circuit with 2 switches. they
are normal on/off switches. if switch one is on then circuit must

The Inverter CMOS linear amplifier in Figure 3.64 on page 158 in the
book the art of electronics. The schematic seem to be unclear, for eg.
the capacitor has only 0.001 value. Is this 1000 uf or 1 nf?. Also
what is the circle connected to the ground just before the 51 ohm

I have an audio amp in a 20-pin DIP, and pins 11-20 are all grounded;
the datasheet says to hook them to a large area of copper as a heat
sink.  My PCB design software leaves an annulus around each pad in a
ground plane, connecting the pad to the plane with a "+" trace.  The