Electronics Forum / Electronics / October 2004

Have a 2KVA 240V 'Generator' that I want to be able to use as  a backup
charger for a 12 volt battery bank that is usually charged by solar
panels. Need a hi capacity battery charger ~ 20amps to runoff the
240volt petrol powered unit.

Hello everyone.  Here's my problem; I would like to convert my vhs
tapes to dvd.  The vcr I'm using is a tv/vcr combo (Samsung CXJ 1331)
which only appears to have a video/audio IN input, as well as a
coaxial cable type input.  Is there no way I can use this to transfer

The people selling these bulbs claim an efficiency of at least 3 times
that of incandescent bulbs. This can't be true. Does anyone know the
actual efficiency difference?
Thanks....

Hello dear electronics fans,
I am studying transimpedance amplifier (TIA) circuit for photodiodes
with bandwidth approaching 2Gbps. So far I have seen in the literature,
Op Amp like TIA IC are used to amplifier the current signals to voltage

Based on my OHM meter I have a good ground on both the trailer and my
truck.
When I turn my truck lights on all lights on the trailer work fine
until I press the brakes...then my lights on the trailer go out. If my

Electronic electricity repository is an energy concept that aims to accumulate
and store electrical energy from any source.  The storage would be intended to
accommodate such things as electric vehicles, home heating, etc.  The best
example is the EV - an electric car that would run ...

I heard or spotted somewhere that putting batteries in the freezer prolongs
there life until needed, is this a myth or what?

I bought one of these a few years back, and it now doesn't seem to be doing
anything to the water. I am searching for a set of installation instructions
to confirm I have it wired right. The company doesn't seem to be trading
anymore, nor has a weblink.

I recently purchased some stepper motors and drives.  The drive has an
adjustable max current setting of .25 to 1.4 amp RMS or (.35 to 2.0
amp peak).  It has an input voltage range between 12 and 24 VDC.  I
realize that increasing voltage won't change the max current through

hi, is there any body that can   give me a quote to make 80 pcb`s.? i reckon
each  pcb to be APPROX  45 mm by 35 mm..
they are double sided , and only consists of a surface  mount plcc32 pad
area and a another [pad  area so i can fit a 32 way header socket.

I am after someone in Melbourne with a PCB etching bath so I can etch a PCB
design. I would do it at my place but I can't have dangerous chemicals in
the house. Let me know and we can come to some arrangement.
Charles L

Does any one know where I can get a film I used one time that is like the
ones screen printers use, is coated blue and once exposed can be used as a
stencil for etching over and over again a good many times?
After being exposed it is put in a developer and developed for about 30

I'm busy building a UV box for photosensative PCB's
I've read various posts about how you shouldnt use glass to cover the
artwork as it stop UV rays. I've also read a few post where they say don't
use perspex - use glass!

http://arm.web7days.com/lpc2106/
US $63  + shipping

are there any good electronic jrojects around?
like any online projects or decent kits avaliable that arnt that expensive
Im not after some silly flashing LED kit or doorbell that we made in school.
Any around the intermediate level?