Electronics Forum / Electronics / January 2006

I am tinkering with some 25 year old TTL logic chips and I need to make a
de-bounce circuit that will stay on for the duration of a the push-button. I
have several ways already to debounce the button close, but they are
one-shot pulses that have thein own duration. I need both the ...

Looking for a way to make a 555 timer astable circuit "triggerable." Seem
all the circuits I see (I think the some one over and over again) show an
astable 555 rigger to run constantly as a "clock." Right now I am using a
transistor to power up and down the 555, but it seems there ...

further to previous posts,tv is now working ok. Following my previous
post earlier this morning the tv is now working ok.
About 3hrs later for no particular reason I turned it on again and hey
presto it's working ok and still is - so far!

I have an old 0-100V (0.2A) HP power supply (HP 6116A), which is
broken.  The output is always 0.6V (when on).  Nothing is obviously
burned or exploded inside.
The problem started when one of the people in my lab connected a

just over a year ago I bought a 51cm colour tv from Big W store.AWA
brand and model no.W571. For the first year,no problems at all,now a
month later,now the warranty's run out (typical!) i've had to get it
fixed (?!) because suddenly one morning i turned it on and there was

Anyone have a need for a Transformer out of an older Tek scope? I can't
recall the exact model it came from off hand, but there are numbers on it to
identify it. It was removed out of a working scope - scrapped only due to no
space.

After much effort, I helped arranged for the State University of New
York to offer a distance-learning (i.e., home study), for-credit,
undergraduate class in transistor theory for this Spring.  At the
moment, however, enrollment is a bit low, so I am trying to promote

Well... It's that time of the year, when it's cold outside and
it's time to find a little project to do.
I'd like to build a Single Board Computer based on 6502 (or 65816)
that would have Commodore's SID 6581 as a sound chip, and TMS9918A as

HE is obviously a troll and replies often get through ones kill filter

I have just returned a vacuum cleaner to Godfreys to fix under
guarantee. The problem is that it suddenly started to trip the safety
switch (core balance relay).
What is the most likely fault?

Central Coast Field Day - Wyong 19th Feb 2006  1 hour north of Sydney
The Biggest Field Day and Hamfest in the Southern Hemisphere
Truckloads of preloved equipment at giveaway prices in the flea market
and disposals area.

The Toadland has spelt a life of Hell to all the migrants unfortunate to be
attracted by its lures !
That Land of Bastards, australia,  built on Crimes Standards has,  thank to
new development,  none of even that mining future, some of the low forehead

I wish to upgrade my 16F84 PIC Programmer (the Charles Manning one from EA,
about 1996) to a new one which does all (Most) PICs. Can anyone recommend a
USB type please? There have been several published in SC recently. Are any
of these worth looking at?

Interesting comment from a clueless toad !
The consequences of it will be completely different indeed, and indeed of
all benefit for the whole humanity :
1) End of Mercury & Cyanide pollution by land based mines

Hi, I'm searching for this book.
It's seems untrovable, someone could help me?
This is the reference:
"Design of oscillator and other harmonic oscillators " by Benjamin