On Friday 31 May 2013 15:07:50 Jan de Kruyf did opine: Thanks Jan.
> 74LS240 = 74HCT240 > > it also gives a 74HC240 but that one has different threshold levels. I should have considered that, but was pi$$ed enough at myself for allowing that to happen that I was distracted. AIR, neither is particularly fond of I/O voltages beyond the supply rails. Subtrate diodes can turn into small scr's, and its roll the dice when a powerdown is done to see if it can be turned back off. But if thats the choice, thats the choice. Thanks for the reminder Jan, its appreciated. > j. > > On Fri, May 31, 2013 at 8:49 PM, Gene Heskett <[email protected]> wrote: > > Greetings to yee who are following my sob story.. > > > > It appears the MOC3052 at least has an led in it, so I replaced the > > led in series with it, with no joy. > > > > Then, trying to use that pocket scope to trouble shoot, I took the > > hook off the probe, which leaves the ground ring around the tip > > exposed, so of course it accidentally had to touch a real ground, > > tripping the breaker in the service box. And of course now the C41 > > isn't working. So I ordered up enough parts to shotgun both twice > > from digikey, including socketing the LM324's in the MC60 controller, > > the MOC3052 and all its 2n440x transistors. > > > > Except one chip on the C41 board, digikey says the 74LS240 is an > > obsolete part and didn't suggest a replacement. > > > > I think I need a beer, this is discouraging. Before I start again > > when the chips get here, I need to make an insulator for the end > > shell of the pocket scopes probe. > > > > Cheers, Gene Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> Secrecy is the beginning of tyranny. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite It's a free troubleshooting tool designed for production Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap2 _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
