555 relay current reducer

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One of Larkin's coarse ritual droning insults.

None that John Larkin seems to be able to follow, or find interesting. He w ants us to admire the stuff he does, and shows massive not-invented-here if anybody suggests ways in which it might be improved. He finds other people 's stuff much less interesting, and rarely condescends to notice it.

That's a fairly bitter statement. John Fields doesn't strike me as bitter - he seems to have quite a lot of fun baiting John Larkin, who rises to the bait all too predictably.

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The usual spelling is "petard".

It was a small bomb-like device, used for blowing down doors and walls.

There was a cast metal chamber, intended to direct the explosive force into the door or wall, which you had to lock in place to resist the force of th e blast.

If you didn't do it right you could get the benefit of the explosion, and b e "hoist by your own petard". You might fall over afterwards, possibly in s everal different directions, but that's an after-effect.

The petard was a military engine, one of many used by military engineers, also called sappers, in breaking through fortifications.

The inductance of the coil

Some years ago I made a valve driver (principle the same as a relay), which monitored when the armature was pulled in, so it used only the power needed to keep the armature in (simple SMPS topology to drive the coil)

I also measured the inductance, to make sure the coil stayed pulled in

Cheers

Klaus

Or an auxiliary contact. Before electronics and PWM and such, some relays and solenoids used an extra contact that opened when the device was fully seated, reducing coil current. The Austin Healey overdrive solenoid did that, and it often worked.

With the benefit of FETs & Darlingtons & asymmetric timing you can sometimes do that with the main contact too

NT

On Wed, 6 Jan 2016 21:04:53 -0500, M Philbrook Gave us:

You're a goddamned (illiterate) retard.

solenoid did that, and it often worked.

Joseph Lucas, inventor of darkness.

Cheers

Phil Hobbs

If the contact didn't open, the coil smoked. But you could take the top down to get fresh air.

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to the door or wall, which you had to lock in place to resist the force of the blast.

be "hoist by your own petard". You might fall over afterwards, possibly in several different directions, but that's an after-effect.

It almost seems like you thought we somehow didn't all already know that.

But John was never "hoist with his own petard" by any latching relay. Once latched, they *can't* explode. There's not nearly enough stored energy.

Besides, everyone knows a petard is furry animal kept for companionship, but not for wits.

Cheers, James Arthur

Is the contact closed (circuit on) or not?

I saw it, didn't care. A latching relay's gain is close enough to infinity for my purposes, even though a mathematician might not agree.

If we're going to insist on literal meanings of words, did John ever attempt to blow a hole in an enemy's fortifications with a latching relay, only to misjudge its effect and be lifted bodily off his feet by the explosion?

Methinks not.

Cheers, James Arthur

Exactly. I really don't care whether a latching relay's gain is infinity or (infinity / 10). It's not a philosophical conundrum for me. It's a discussion of utterly no conceivable value or interest. World peace does not depend on it.

All I care is how much power it needs, what advantages that offers, etc. The labels don't matter, not even one ... tiny ... bit.

Cheers, James Arthur

yeah, the power gain is comparable to a MOSFET.

So, the game is that John needs netcopping for saying latching relays have infinite gain because it's not literally true (even though it's close enough, and we all knew what he meant),

but then you insist he was literally lifted off his feet by an exploding relay, and want to argue over whether world peace *could* literally depend on the exact use of the word 'infinity'?

That just sounds like a lot of pointless word games about things that never mattered. Zero value.

No, thanks.

Cheers, James Arthur