Alt-BEAM Archive
Message #13107
To: beam@sgiblab.sgi.com
From: "Justin Fisher" jaf60@cantva.canterbury.ac.nz
Date: Fri, 07 Apr 2000 08:56:02 GMT
Subject: Transistor switching time question
I'm planning a circuit part that acts like a SE-triggered switch, using
transistors. When the SE signal hits, it'll both turn off a 3906 and turn
on a 3904. However, like an H-bridge, if both 3906 and 3904 are on at the
same time, it shorts the main cap. As this needs to be an efficient
circuit, I wondered at the possibility of a difference in transistor
switching times - something that could result in an extremely brief short
each time it triggers. Is this a realistic concern? Should I put in a small
cap or something to add a tiny delay to the 3904 switch-on Just In Case?
13108 Fri, 7 Apr 2000 07:30:43 EDT Re: WCRG? (plus info on WCRG events) beam@sgiblab.sgi.com JVernonM@aol.com In a message dated 4/7/00 12:57:58 AM Eastern Daylight Time, Synet@Psynet.net
writes:
> Aquavore
> There is a one meter long, underwater race track. But...
So, is this still the "official" name for this kind of bot? I mean, I thought
we all pretty much agreed that they don't eat water. I guess accuracy is not
a requirement for this particular scientific discipline. But hey, it still
sounds cool in Greek, right?
See ya,
Jim
http://www.geocities.com/SoHo/Exhibit/8281/beamart.html
ICQ# 55657870
13109 Fri, 7 Apr 2000 20:14:48 -0700 light bridge
> Okay, so here's the deal, I'm thinking of going back to attempting
> phototrophism with my first walker, what i want to do is make a light
bridge
> to go across the main timing resistor to create a phototrophic bot. What
i'm
> thinking from there is to make this style bridge...
>
> ------>|------/\/\/\------|<-------
>
> The two photodiodes would have the cathodes facing inward with a resistor
> inbetween to prevent the bright light of the sun from making the
occilation
> too short! Will this work? thanks!
>
> -Spencer
>
> <http://www.botic.com/users/beamstop>
>
> not a robot scientist
> not a college major
> not a grad student
> not a professor
> not a very organized person
> just Spencer (isn't that impressive enough?)
>
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