Electronics Forum / Electronics / February 2005

I have some LEDs, resistors, and a breadboard. I want to write a
program that will make the LEDs flash in certain sequence (they are
attached to the board.) i have to proper resistors and everything so i
won't damage anything (i hope). i want to connect the breadboard to the

I've got a simple question that's probably very stupid, but I'll ask
anyway: I've bought (on the cheap) a couple of basic transformers that
were advertised as both 220V-110V and 110V-220V transformers, because
I'd like to run some US electrical equipment over here (the

I'm trying to build a high voltage (170v) H bridge motor driver but I've
run into a bit of bother trying to reduce the voltage to something that
the opto coupler and mosfets can handle. I don't want to use a
transformer because it's too big, and I only need enough current to

Someone please help me out..
Please see the program below which is working the way i don't want it
to.
I've interfaced 5leds to PORTA( i'v used a pull-up in PA4 pin) and am

I would like to get back into electronics to build some projects.  Back
many moons ago in HS I did some stuff with electronics simple stuff with
555 timers and things.  I'm hoping I can find someone that is familiar
with building digital circuits that could use some help ...

Are there any microphones, i.e. bugs that can pick up someone's
subvocalizations, bodily sounds, etc., WITHOUT being attached to that
specific person? Or is it impossible? Thanks for any replies.

Anyone know who is making the SC heart monitor kit as published in feb 05?
Disk smith Bankstown square didn't seem to know about silicon chip (or what
a kit was) and jaycar bankstown rang jaycar head office to be told that they
were not going to make it.

My wife's 15-year old ONKYO TX-810 has developed what seems to be a power
problem.  It turns itself on and off every few seconds, eventually leading to
a total shutdown.  
We took it into an electronics shop and they told us that the power supply

Trying to find a place that Has Schematics for a PIC programmer, I would
rather Build than buy one , for the experience.
Also, I had dloaded picbasic demo, and i can only get it to install on win98
, not xp,,

Does anyone know how to disable the keypad on this type of telephone?
Simply unplugging the keypad stops the phone working completely.
I want to disable the keypad but still be able to talk on the phone.
Thanks

Hey guys,
Looks like my 3-yr old Sharp crt tv has a magnetism prob. The picture lost
clarity over a few weeks and finally the green went missing completely.
After a week's rest, the green is coming back. I never switched the thing

Does anybody know where in Melbourne to buy replacement antennas for older
style Panasonic cordless phones?
Thanks in advance

I bought a used variable DC power supply (0-70V, 0-20A) that was used by its
previous owner with 220V AC input (switchable to 110, which is what I would
want). The specs say that the two fuses on the back of the power supply's
input should be "8 AT" for 220, which they currently ...

Today I was told the thicker wire has higher resistance, (Auckland)
Once I went in and asked if they sold "hockey sticks" so I could put up a
aerial the person said "sorry sir we don't sell sports equipment"
Someone else told me they were in a shop and they heard a salesman saying ...