This is starting to remind me of my tractor problem. 1950 Ford 8N that is. The problem is, if you're dumb enough to be around the PTO off the back and get entangled and hence expire. On a similar board lots of controversy about how best to protect against these sort of mishaps.
So, I hooked up mechanics wire wrapped around the juice going to the coil, and routed to the back of the tractor. SO, if I ever got in trouble back there, I could just YANK the thing and thereby preserve myself. I ran with that setup for a few weeks and then got to worrying too much about THAT getup malfunctioning, getting snagged in the brush, etc.. I think best to just get the AC4 upgrade kit and worry more about getting hit by a bus or something. Chuck, K1OM, Alachua, FL On Dec 15, 2007 7:50 PM, Bill Horne <[EMAIL PROTECTED]> wrote: > > Bill Horne <[EMAIL PROTECTED]> made an utterance to the drakelist gang > ---------------------------------------------------------------------- > Mike, > > I understand, and perhaps "Crowbar" is the wrong term: there's certainly > enough technical expertise on the list to suggest a viable circuit. > > Here's my idea: if bias drop below 50% of normal, then we could trigger > an SCR to short the AC source and blow the fuse. > > 73, Bill W1AC > > > Mike Bryce wrote: > > > > Mike Bryce <[EMAIL PROTECTED]> made an utterance to the drakelist gang > > ---------------------------------------------------------------------- > > Gosh.. > > > > I thought about that, but here's no way to crowbar the bias circuit. > > > > in the old supplies, the damage is caused by a "lack" of bias. So, if > > there is a failure of the bias supply, i.e. it quits, how can you fix > > that? > > > > the only way I could come up with would have been a system that > > deprives the transformer of it's primary voltage, shutting down the > > supply. It would have to default in the off position too, as you would > > not want the supply to cycle on, find the missing bias, then shut > > down, the power up, find the missing bias supply, shut down and on and > > on. > > > > > > mike > > > > Mike, WB8VGE > > SunLight Energy Systems > > The Heathkit Shop > > http://www.theheathkitshop.com/ > > J e e p > > o|||||||o > > Note: No trees were killed in the sending of this message, but a large > > number of electrons were terribly inconvenienced > > > > > > On Dec 15, 2007, at 5:28 PM, Bill Horne wrote: > > > > > > Bill Horne <[EMAIL PROTECTED]> made an utterance to the drakelist > > gang > > ---------------------------------------------------------------------- > > Is there a provision in the kit for a crowbar circuit to safeguard the > > rig if the bias (or other) supply fails? > > > > Bill, W1AC > > > > > > > > ---------------------------------------------------------------------- > > Submissions: [EMAIL PROTECTED] > > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in > > body > > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > > ---------------------------------------------------------------------- > > > > > -- > Lookng back through time you know its clear that i've been blind > I've been a fool > To open up my heart to all that jealousy that bitterness that ridicule > > David Gray > > > ---------------------------------------------------------------------- > Submissions: [EMAIL PROTECTED] > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > ---------------------------------------------------------------------- >
