design help

Probably good enough for lots of apps. Turnoff is slow enough that it doesn't need a flyback diode.

It can be flipped into a follower, too...

in which case the relay dropout voltage contributes to the time delay.

John

I'm sure you and Rich will post some great circuits and show us how wrong we are.

John

You threw stones at John F, then posted a very soft transition solution... did you not?

Did you bang your head badly during that skiing spill ?:-)

...Jim Thompson

I prefer the version with hysteresis for being easier on the output transistor, but I screwed up--the output's inverted, I used 'R3' twice, and I left out the diode across R2.

I'll try to redeem myself.

Bwahahahahaha! Damn! Almost snorted wine up my nose :-(

Bwahahahahahaha!

...Jim Thompson

Now now boys, we've got better things to jaw about. Check out the Newshour on PBS re: the budget. Stunning.

The Nightly Business Report too. Yikes.

Cheers, James Arthur

I don't want to watch something like that... it would upset me so much I couldn't enjoy the nice (French-style) pot roast about to be served.

And I'm sipping a nice Coppola Diamond Collection 2006 Black Label Claret ;-)

...Jim Thompson

Enjoy!

James Arthur

I make mistakes all the time, some here. And I freely admit the ones that are obvious. We just sometimes disagree on what's actually a mistake.

Get a life. You're turning into an old hen, strutting and clucking.

If I misunderstood the OP's polarities, so what?

Get a life.

John

TWO old hens.

John

I called him an old hen, which is pretty accurate. What's wrong with soft turnoff of a relay? The armature stays seated until it doesn't.

Nope, skiers and motorcyclists don't often land on their heads. That's for snowboarders and horse riders.

Hey, post a relay delay circuit of your own and quit clucking. You're turning into the village gossip.

John

Poor baby ;-)

...Jim Thompson

It can be done though, I know. I don't crash often, but coming off the side of a slope into rough snow at very high speed once, I jumped off a little mound and landed on another mound almost 10 metres away... except it was a minimal bit of snow covering a bush, into which my skis vanished and stopped. I flew forward out of my bindings and did a head-plant deep into the soft wet snow a further 8 metres away, and distinctly recall my neck being in a strange and unusual position as my whole body flipped violently over the top, wondering if this was going to be my last thought. Landed flat on my back and got up just dazed and with a stiff neck, and had to climb back up to get all my stuff.

Tell that to Sonny Bono. Oh... that's right... you can't.

Tell that to Gary Busey. Oh... That's right, he ALSO hit his head from a bike spill.

No, they may not 'land' on their heads, but they sure do have a high instance of head trauma involvement in such circumstances. So at some point while they are wiping out, head impact occurs.

He skied into a tree. By the time he landed, it was pretty much over.

It can be done, especially if you ride without a helmet like GB. But most ski and motorcycle dumps are pretty much horizontal. If you are going really fast, you can tumble and then it can get nasty.

Sure. But falling off a horse is a lot more dangerous... good chance of vertical impact. And snowboarders, going fast downhill across the slope, can catch an edge and get flung down a slope head-first.

This time on the mountains, I saw a LOT of people, especially snowboarders, wearing helmets.

John

KXP1624, 24 pin, 14" fanfold. Works great. I go through a box of paper and a ribbon per project, roughly.

We also have an HP 14" fanfold inkjet, but I like the Panasonic better. I've heard that there are serious 14" fanfold laser printers, for serious money. Maybe if I get rich some day...

John

Sorry, they violate the 6-character symbol limit.

John

Six characters? Only crappy tools had such draconian restrictions thirty years ago.