From: Jim Thompson
Subject: Re: zero-power toggle circuit; was, how to master electronics
References: <3DD39D90.email@example.com> <firstname.lastname@example.org>
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Date: Sun, 17 Nov 2002 18:08:27 GMT
NNTP-Posting-Date: Sun, 17 Nov 2002 13:08:27 EST
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On Sun, 17 Nov 2002 16:51:46 +0000,
Terry Pinnell ,
In Newsgroup: sci.electronics.design,
Entitled: "Re: zero-power toggle circuit; was, how to master
Wrote the following:
|Winfield Hill wrote:
|>> Win, Jonathan: I'm struggling to understand why I can't get it to
|>> simulate. I don't have a BSS110, but tried several alternatives
|>> for Q2. Can you positively confirm the circuit's OK please?
|> It's OK. Were you careful to connect source of the Q2 p-channel
|> FET to the + rail and the source of Q1 n-channel FET to ground?
|> I dunno, just a stab in the dark as to what you're doing wrong.
|> Are you activating the switch for just a short time, 1/4 second?
|>> I downloaded the BS110 Fairchild data sheet which says "They can
|>> be used, with a minimum of effort, in most applications requiring
|>> up to 0.17A DC". I thought we were talking power switches?
|> Hey that wimpy part was Wafer's selection. You can try something
|> more serious like an IRF9540, or IRF9Z34N. Or maybe an FB-class
|> FET, a real man's part in a SOT-227 bolt-it-in 500W package. :)
|By bad luck my initial choice of MOSFET wouldn't toggle at all. But
|subsequent tests with a variety of types gave surprisingly
|inconsistent results. I've shown my test circuit and results at
|Given that my simulation of Win's earlier circuit (using a similar
|button-pressing section) seemed 'robust', I'm puzzled why these are
|relatively erratic. Is it a flaw in my circuit or interpretation? Or
|is the circuit itself genuinely sensitive?
|Hobbyist, West Sussex, UK
Looks to me like *only* the IRF9513 case failed. (t=0+ condition is
arbitrary unless you use a .IC)
You should show all the nodes for the IRF9513 case so we can see what
is wrong with your design ;-)
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
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