AVR-Chat

Andy, that sounds like a great suggestion.  I'll order a few extra switches
and subject them to this test, as well as taking one apart.   Thanks for
everyone's help.  Steve

 

From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
Of Andrew Mathison
Sent: Sunday, January 10, 2010 2:52 AM
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] Re: break before make

 

  

Hi MoreOrLess 

its better to use an AND gate to check such things with a LED output....

Some switches are designed to be make before break, and moving the switch
fast may not allow the fuse enough time to heat up and burn through......but
if the AND gate gets a high from both legs of the switch, it will flash the
LED, especially easily seen if a cap is placed to store some energy each
time the AND gate switches....

I have not discussed the circuit at great length, a resistor will also be
needed to reduce current to the LED.....but from my head all you need is a 5
volts supply, a single two input AND gate, a small cap, a resistor and a
LED......and a plug board to mount things on!!

regards

Andy
----------------------------------------------------------
I have taken switches like that apart and all have had an arm with contacts
on both sides goes back and forth, to and fro, with the movement of the bat
handle. Not being able to be two places at the same time... You get the
picture.

That said, if you took a low current fuse, say 1/10 or 1/100 amp job and
connected a battery post through the fuse and to one of the outside
terminals of the switch, then the other outside terminal of the switch back
to the other post of the battery.

Now flipped the switch back and forth, how many times, pick a number, 1, 10
or 100, the fuse will still be good. Two possibilities. One, its break
before make. Two, the switch never makes long enough to blow the fuse but
that I think is unlikely. The make before break would never be long enough
to do any good, so what would be the use.

Good luck and don't burn the house down,
Mike

Greetings from

Andy Mathison

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