Electronics Forum / Basics / June 2004

Hey Guys
Not sure if this the right Forum but hey ...
I'm lookin at makin my own pic programmer from scratch. The finances are a
bit low to purchase the commercial ones.

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The users of some digital cameras with infrared remote shutter release
ability have discovered codes for universal television remote controls
which will work on their cameras.  

I wonder if anyone out there has a sound no-frills way of monitoring
either a 10mV or 2V DC signal (at approx 1 to 3 Hz)using
shareware/freeware and taking the signal through either the Parallel
port or a sound-card?

Ok so i got this six pin ic on a board that is about ten or more years old and
i'm unable to find any data on it at all, it;s definatly an optocoupler and it
should be an ac input, i say should be as the wire feeding pin one is 100 v ac,
i'm unable to asertain as to the sort of ...

Does anyone know where I can find a good diagram of the basic (ignition)
electrical system of a car? (Preferably on the web). The manual and a
couple books that I have aren't quite enlightening, and I haven't been
able to find anything good with google...

I have a couple of flash units ripped out of disposable cameras. They both
need to have two contacts physically pressed together to trigger, and these
contacts are relatively large, so I assume they could be conducting large
amounts of power. The caps only have "9(2)" and "4 a" ...

I'm building a flight yoke out of a 'gunners power control' yoke from a M48
tank.
Unfortunately, I had to use 2Kohm potentiometers, because they were the only
ones that would fit/were available

http://www.fairchildsemi.com/an/AN/AN-4134.pdf
http://www.fairchildsemi.com/collateral/AN-4134.xls
The xls file is to be used with the design steps in the pdf file.
In the pdf file, I'm getting stuck at : Step (3)  (b) RCD reset

I'm looking for a bit of advice on a 741-based thermostat circuit that needs
some hysteresis, or lag between "on" and "off". I imagine this is a pretty
basic problem, but it's beyond my meager abilities.
I've posted the circuit and details at the following link. Any input, either ...

I need a VERY simple PIC project done but I am not an engineer.  I do
know it is a simple project because I have read accounts of how it is
done, I just can't translate that into actually DOING it for myself.
I know it uses the PIC model 12C508A.

I am wondering whether is there a Simple schematic for a Heart Rate monitor
using infared LED.
My idea is to design a simple heart rate monitor which detect heart pulses
by placing the finger over a pair of Infared LED (one receiev and one

Hi Gang..
I want to power a rotating load.  The load has many components.  The input
voltage is 220AC.  The eventual load will be 5, 12,and 20 volts DC for
computer type components. One rotation takes about two minutes.  So!  Here

Hi,
 Debugging using Hyper Terminal is interesting. I know that
microcontroller communicating with HT through RS232, but what is the
"character format" that HT using ? i.e. how HT know that the micron is

I bought the kit from radioshack that lets you make pcb boards, but hte
instructions are pretty lousy.  i'm curious if there is a way to design the
PCB on the computer, print it out and somehow transfer this to board.  Or
perhaps better instructions.  Any suggestions?

I have a VERY big step-down 210-220-240 transformer here. Would there
be able problems running it on 120?
Did some testing with 120 using a 2amp fuse im able to get the voltage
i was hoping for. But befor i go and wire everything up. just wanted