From: Terry Pinnell
Subject: Re: zero-power toggle circuit; was, how to master electronics
Date: Fri, 15 Nov 2002 14:40:36 +0000
NNTP-Posting-Date: Fri, 15 Nov 2002 14:40:51 +0000 (UTC)
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John Devereux 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
>You are using a *P-Channel* device for Q2, yes?
Yep. Currently IRF9540.
>>Can you positively confirm the circuit's OK please?
>Looks OK to me (but I haven't tried to simulate it).
>>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
>Yes. In fact I believe Win pointed out that you could use a
>This is a neat little circuit.
John, Win, Frank: Thanks for confirmation. I'm darned if I can get it
simulated. Won't toggle off on second 200 mS push of N/O button, 0.5 S
after the first. I'm pretty sure I've made no stupid slips with my
schematic. And I'm using the same button-simulator section that I used
for Win's earlier circuit, which simulated fine. I suspect CM's models
- although I've rung the changes with no joy.
It would be interesting to see somone simulate it with another Spice
Hobbyist, West Sussex, UK