35427Re: [softrock40] Re: softrock lite - troubleshooting the flipflop
- Aug 4, 2009bobboy, that makes ME feel better. a guru with a snafu !!!!i dont feel so stupid after all !!!73, w5xz, dan
--- On Tue, 8/4/09, g8voip <g8voi.reeves59@...> wrote:
From: g8voip <g8voi.reeves59@...>
Subject: [softrock40] Re: softrock lite - troubleshooting the flipflop
Date: Tuesday, August 4, 2009, 7:09 AMHi Tom,
Good to hear that, see, you just need to have a little faith!
Contrary to a lot of what is published, it is extremely hard to damage most chips, they seem to be able to withstand a lot of abuse! Shorts on input pins rarely causes any harm.
I put one of the Atmel AVR chips in the socket the wrong way around the other day, when I was doing some of the testing for the new v15.11 firmware.
Only found it when I was having problems with the PC failing to recognise the device. The first I realised was when I put my thumb on the chip and got a blister straight away! Despite that, once I let it dool down, put it in the right way round, all was working fine, but I do have it marked in case it does anything strange in the future.
Hope the next part of the build and testing goes fine,
73, Bob G8VOI
--- In softrock40@yahoogro ups.com, tmac <tmac@...> wrote:
> When troubleshooting, it's always good to be convinced by a friend to
> recheck your conclusions.
> I resoldered pin 3. The voltage is 2.5 v now as it should be. Too late
> for me to get the scope out to see if the chip is working.
> I'll report in tomorrow evening with results.
> Ok, Im re-excited now.
> Thanks for the hand-holding.
> Tom -WA4FYN
> sailingto wrote:
> > --- In softrock40@yahoogro ups.com
> > <mailto:softrock40% 40yahoogroups. com>, "g8voip" <g8voi.reeves59@ >
> > wrote:
> > >
> > > Hi Tom,
> > >
> > > Sounds like you have possibly managed to damage the chip somehow,
> > but take a very careful look just in case it is just a small solder
> > splash or whisker between pins 3 and 4.
> > >
> > > If you just carefully push pin 3 back onto the pad, does the fault
> > return again?
> > >
> > > Any manufacturers 74AC74 should be alright, it the 'AC' family part
> > which is important as far as speed and interface levels go.
> > >
> > > 73, Bob G8VOI
> > >
> > Great idea on the needle Bob - I'll try and remember that for lifting
> > a single pin on an IC....
> > Tom, Mouser Part #: 512-74AC74SC Manufacturer Part #: 74AC74SC is
> > listed at 32 cents each - that one worked for me. I've got to order
> > more of them along with some other parts pretty soon.
> > Good luck and having fun,
> > Ken H.
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