Electronics Forum / Design / December 2005

Hi. Hope you can spare me a little of your knowledge? I want to combine
the mono headphone out of my walkie talkie/ 2 way radio with the stereo
output of my mp3 player and the resultant signal delived to a pair of
earphones. I would not want to lose the stereo and I guess I would ...

I have some ideas about how to turn a standby inverter into an online UPS
I got a circuit working on my breadboard to detect the power-out an
command to switch over within 2ms.
My question, what to switch? I’ve read some frightening stories abou

I am new to This group(sorry for my english is very poor please
manage).
I want set Lab for RFID Reader.
my idea is to pcmcia card act as a RFID Reader it is possible to

I am designing an IC amplifier and i want to remove the DC component
from the output.
I thought of using a capacitor.
How can i implement a capacitor using a MOSFET. I heard i can connect

       my product need  use multiplying DAC and need it's multiplying
function,But I difficult to buy it,can i use non-multiplying dac chip
to replace it?
      what is difference  between multiplying dac with non-multiplying

Yancheng Golden Idea
China LED Display and Sign manufacturer and exporter
http://www.pop-sign-display.com

Can anyone design a up/down counter with jkff that can load and hold
with these:
11=load,10:down count,01:up count,00:hold

I have come across this great "POV" project:
http://www.ladyada.net/make/minipov/index.html
which uses a 630. Now I am in India and only have a 628.
how can I make the 628 work?

I'm looking for a simple electronic switch that will relay 120VAC at
60Hz and can be controlled by an external control signal (on/off).  It
seems like something like this would be standard but I'm having trouble
finding it.  Any ideas?  The less expensive the better.

I need to generate 1khz, 2khz, 3 khz, 4 khz, etc.. up to 32 khz..
They don't have to be exact.. Each free running, each on their own
output..
My first inclination was to use counters, but that would be a few

I need to limit the output of an ordinary unregulated power supply.  The
voltage ranges from 18V to 35V, taking load and line variation and ripple
into account, and the load draws up to 250mA.  I'd like to limit the output
to 24V (give or take a volt); I don't care if it drops ...

I found the chips in the subject and can't found any datasheet in
the internet...
The motorola XC68704P2S  is a 28 pin cerdip quartz window.
I found only 68705...

I tried using this heated air gun today. To those not familiar, here's
how it looks:
http://yabe.algebra.com/~ichudov/misc/ebay/Raychem/
(pictured is a similar unit that I sold a long time ago).

I thought I would share this informaton with the group and start a new
topic.  I came across this information the other day regarding neural
networks and the applications in electronic design.  Take a look below.
A long time goal of artificial intelligence (AI) is the development of

Does anyone have the AM7960 Datasheet. I have been searching all over
but can't seem to lay my hands on it.
I would be really grateful if someone can send me the sheet.