sci.electronics.repair Google Group

Re: optimus STAV-3170 Help

woodruffrep...@frontiernet.net (Gary L. Woodruff) — Fri, 21 nov 2008 19:36:33 UT

Thanks for the help. I measure Dc offset @ the speaker terminals and get
12.6 mv & 14.5 mv. The left channel is fine and does not trip
protection. My biggest problem is the way the hs mounts to the board the
foil side of the board is not accessible to probe. This makes
comparing voltages between the two channels impossible. If i could

Re: Monostable made from OR gate and CR network , pulse duration ??

fzab...@iinternode.on.net (Franc Zabkar) — Fri, 21 nov 2008 19:26:14 UT

On Thu, 20 Nov 2008 13:27:10 -0800 (PST), Graham <g0...@hotmail.com>
put finger to keyboard and composed:
An OR gate will have an output of 1 whenever input #1 is a logic 1,
regardless of what happens on input #2. OTOH, an XOR gate (eg 74LS86)
will behave as you describe.
A Motorola SN74LS86 has a guaranteed minimum input high voltage of

Re: Power Inverters

d...@davenoise.co.uk (Dave Plowman (News)) — Fri, 21 nov 2008 19:08:50 UT

In article <4926d877$0$27232$ba620...@tex t.nova.planet.nl>,
To get 100 volts you'd need not only a faulty regulator but a faulty or
disconnected battery. Turning the average alternator hard on only usually
results in the high teens volts wise. Although I've no idea what happens
with some of these modern ultra high powered water cooled types. ;-)

Re: Digital to analog TV signal converter - which one?

notthisjoerg...@removethispacbell.net (Joerg) — Fri, 21 nov 2008 18:49:23 UT

[...]
We've adopted the habit of recording things and then spooling forward
almost to the end to see if the recording stuck. Nothing is more
aggravating in TV watching than having a great movie pixelate and drop
out after having seen half of it. So, you end up recording stuff you
normally would watch live, meaning all that DTV is being rendered in

Re: Digital to analog TV signal converter - which one?

waynermvjnktiff...@morejnkasi.com (Wayne Tiffany) — Fri, 21 nov 2008 18:31:39 UT

That's what I was hoping for - a converter that would still let me use the
programmed vcr. Does anyone know of others out there?
WT

Re: End of analog TV

glenz...@nospam.xmission.com (GMAN) — Fri, 21 nov 2008 16:30:40 UT

Yes you have mountains in Scotland (Visited there a while back, love your
country and its people BTW!!!) , but you havent seen mountains till you visit
the Rocky Mountains. We have a severe problem with TV signals and mountain
ranges in the far western United States. I live in Utah and its amazing you

Re: remote controlled audio mixer/equalizer project

m...@_cybertheque.org_ (msg) — Fri, 21 nov 2008 16:20:05 UT

>
>
>> Greetings,
>>
>> I would appreciate some suggestions for implementing a stand-alone audio
>> mixer/equalizer box using commodity components, in the shortest
>> development time at the least possible cost. I am tending to want to to
>> use four PCI sound cards in an older PIII 1u rackmount cpu to create a

Re: optimus STAV-3170 Help

m...@petitmorte.net (Meat Plow) — Fri, 21 nov 2008 16:03:00 UT

On Fri, 21 Nov 2008 10:22:25 -0500, "Gary L. Woodruff"
My guess is DC shorted out whatever couples the protect circuit to the
output or there is too much DC offset on the repaired channel. Do some
voltage / current comparisons with the other channel provided it is ok
and not harboring some underlying problems too.

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Re: Power Inverters

burrynulnulf...@ppllaanneett.nnlll (Sjouke Burry) — Fri, 21 nov 2008 15:49:12 UT

Fat wires directly to the battery has always served me
well in a number of instrumented cars.
Only one accident with a blown regulator in a generator,
suddenly about 100 volt instead of 12 volt.
That was over a period of 40 years.
The battery works like a rather big capacitor. :)

Re: optimus STAV-3170 Help

woodruffrep...@frontiernet.net (Gary L. Woodruff) — Fri, 21 nov 2008 15:22:25 UT

The original transistors were 2SC3281 and 2SA1302, they were replaced
with NTE2328 and NTE2329. The other components replaced were Q512, D520,
D522, R612, R614. any help would be greatly appreciated.
Thanks, Gary

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i...@leaved.com (Ismo Schmitt) — Fri, 21 nov 2008 13:57:05 UT

T.K.. No:9 -07. ongittua faktaa: 20% maailman sähköenergiasta tehty
vesivoimalla.
*Verrokiksi, että maailman energiasta on esim. ydinvoimin tehty vain ja
ainoastaan 2%.
Maailmassa on tällä hetkellä 45 000kpl suurpatoa, huolehtimassa ihmisten
kastelun ja vedentuotannon j a energian tarpeeesta. Vain noin 50%

Re: Digital to analog TV signal converter - which one?

grizzledgee...@comcast.net (William Sommerwerck) — Fri, 21 nov 2008 12:28:25 UT

I bought a Zenith earlier this year, based on some Web reviews. It's a snap
to set up (it does almost all the setting up for you), EZUU, and the picture
quality is good.
However, as others have pointed out, digital is not a panacea for any and
all reception problems. You have to have a strong, reasonably clean signal.

Re: Surface mount chip problem

dive...@tcp.co.uk (N_Cook) — Fri, 21 nov 2008 12:26:38 UT

See new thread
title
TIP: Poor man's conductive epoxy

TIP: Poor man's conductive epoxy

dive...@tcp.co.uk (N_Cook) — Fri, 21 nov 2008 12:25:22 UT

I have some 20 year old silver loaded paint/ silver conductive paint
Electrolube SCP003 ,kept in a 35mm film pot, in fridge. It cannot be called
paint now, but not totally dried out, more like paste. I mixed a little with
the resin part of some also quite ancient but good epoxy , bulk 1kg purchase
about 10 years ago, also kept in fridge (red cap = resin ? any standard ?)