Electronics Forum / Electronics / December 2007

Does anyone know of a small/mobile/battery-powered adjustable DC power supply?
Something like a rechargeable one that can be adjusted at least from 5VDC to 12VDC (preferably from 0V to 30VDC), that is regulated and that is suitable to bring out on small service jobs to power ...

Can someone site location or post example code for a MAX6969 LED driver for
8052 project?  I have the Max chip for driving LED's prototyping on a 8052
development board.  It uses "industry standard" 4-wire serial interface
(SPI?).  I have BASIC code for a I2C interface--could this ...

A news report this afternoon related to a house fire. According to the
reporter, the fault was thought to be attributable to an "overloaded power
point, which was connected to a wide screen TV and DVD player". Yikes! I
figure a worst case power consumption of 400 Watts! Overload? ...

I want to reduce the voltage from 1.5 volts to 1.0 - .90 volts.
What resister would do this and what end goes toward to 1.5 volt side?
Thanks

I want to reduce the voltage from 1.5 volts to 1.0 - .90 volts.
What resister would do this and what end goes toward to 1.5 volt side?
Thanks

There was a thread a few months(?) ago about these. I bought and installed
mine then. Came back after the break to find that water had got into the
battery compartment, corroded the battery terminal away and as a result the
sprinkler had been on for goodness knows how many hours! ...

Hi I have an akai tv, CTK147, (its really old), but was a goodie
once.  There is no sound and no picture. Has anyone ever had a go at
fixing one of these models(or even any akai?). I am guessing the power
supply. Help appreciated.

http://monkeebidness.com/thing.jpg
I don't know why I have it. I don't know what it is other than it's a cable
with a stereo plug on one end and what appears to be a light on one end with
velcro

G'Day all.
I was wondering if anyone knew where I could get a three phase bridge
rectifier in Australia?
At least 50V, can be 10A or higher.

Hi I have a remote control automatic Garage door opener.
On 2 occasions now, the door has opened by itself.
it did it about 6 months ago, and it did it again last week.
I called the installer and he said it was impossible, that there are

What technology would be best for a computer display that has to survive for
long periods in a hot environment, up to 40C days, 27C nights. Doesn't have
to be particularly hi res or pretty, just has to hang in there.  TIA

Hi. I want to understand adsl better so I can diagnose a faulty or
weak signal when I see it. My own broadband at home is standard adsl
through a BT line (with filter). It's always worked well so I tested
it on an oscilloscope. When I put the scope probe onto the terminals

Just had a colour CCTV camera delivered, I opened it up to see if it
was just a standard module board that I could squeeze into a smaller
case... to my surprise, I found the auto-iris connector only has V+
and ground wired (no video or drive - is the lens supposed to guess

I have collected through the years many Stepping and Hobby motors
collected from CD-Rom drives, DVD-Rom Drives, audio and video
equipment, toys . All motors are tested and  I do not have a minimum
order.