Re: [time-nuts] Lightning 1, tbolt 0.

Yes the last word is accurate for lightning and TBolts or anything else. The super hot chips a clue to trouble. The other thing on a hit is that months later stuff starts acting up. Seven hits over 30 years and yes I ground stuff. Regards Paul WB8TSL On Wed, May 11, 2016 at 8:48 PM, Scott Newell

Re: [time-nuts] Lightning 1, tbolt 0.

At 03:19 PM 3/31/2016, Ryan Stasel wrote: I do know 74AC04’s are horribly prone to ESD damage… replaced more than a few when working on older bench multimeters. You may need to get in there and probe a bit. In my case, my bad RS232 driver was drawing about 350mA and getting VERY hot, VERY

Re: [time-nuts] Lightning 1, tbolt 0.

Hi Like many others, I have had no problems with the Maxim RS-232 chips running at 3.6V. They have a nice table in the data sheet that includes the proper caps for 3.6V operation. The data sheet clearly states that they will run from 3.0 V to 5.5V supplies. They call out the capacitor values

Re: [time-nuts] Lightning 1, tbolt 0.

On Apr 1, 2016 00:10, "Mark Sims" wrote: > > On the subject of RS-232 converter chips... I have had problems running MAX3232's at 3.6V. Sometimes they work, sometimes they don't. Sometimes they get freaky hot. The general symptom seems to be no -6V output. Are the

[time-nuts] Lightning 1, tbolt 0.

On the subject of RS-232 converter chips... I have had problems running MAX3232's at 3.6V. Sometimes they work, sometimes they don't. Sometimes they get freaky hot. The general symptom seems to be no -6V output. I've never had problems running MAX232A's at 3.6V, even though they are

Re: [time-nuts] Lightning 1, tbolt 0.

At 08:13 AM 3/31/2016, paul swed wrote: Its just that a strike that close creates one heck of a pulse. Further todays homes may have a lot more wire in them phone cable power and ethernet. So lots of ways to carry the pulse. Agreed. The only tbolt cables attached, serial and PPS, ran around

Re: [time-nuts] Lightning 1, tbolt 0.

Hi Scott, The RS232 “driver” is a MAX232 clone (mine was an Intersil 232IBE). I have since replaced with a MAX202 from TI, as it is a direct drop in replacement, and has much better ESD/Latch-up protection. The MAX3232 has similar protection… the Maxim and TI MAX232 parts both seem to

Re: [time-nuts] Lightning 1, tbolt 0.

I had a lightning strike on our roof last year - blew slate tiles at least 15 meters away. Burnt out several ports on my ethernet switches. And also took out my Symmetricom TS2100 GPS clock in strange ways. If anyone wants a peculiar TS2100L then let me know! On Thu, Mar 31, 2016 at 9:13 AM,

Re: [time-nuts] Lightning 1, tbolt 0.

Scott Sorry to hear that. I do not know whats used on the output. But your guess is pretty good. I had a nearby strike on a tree 50 ft away and it damaged a ton of equipment. Yes it was all grounded and not to start a debate here about grounding and such. Its just that a strike that close creates

[time-nuts] Lightning 1, tbolt 0.

10 MHz output active, no PPS, no comm with LH. My tbolt was disconnected from the outdoor GPS antenna today, and so I wasn't too concerned when we had a strike in the backyard this morning. The PC attached to the serial port and PPS output died, and that cable was fairly long, so I guess