Alt-BEAM Archive
Message #12118
To: beam@sgiblab.sgi.com
From: Darrell Johnson beamtastic@yahoo.com
Date: Sat, 18 Mar 2000 21:12:50 -0800 (PST)
Subject: [alt-beam] Re: PM1 SE
Well, if I remember right, the diode adds about .7
volts to the trigger voltage. (someone please correct
me if I'm wrong) I know that's what happened to the
PM1 variant that I used on my beamant. Try hooking it
up to a test cap that can handle a higher voltage, and
use higher voltage solar panels. If the SE triggers
with that, then you can bet that's where your problem
is coming from.
darrell
> Chris wrote:
> I just finished a bot using the unicore circuit. It
> works really well from
> a power supply, but I can't seem to get the PM1 SE
> working properly. It
> uses all the same values as on BEAM-Online, but I
> used the TRZVN2106 from
> solarbotics instead of the 2N7000, a 0.33F gold cap,
> a 1381 J, and two
> 24x33mm solar cells in parallel.
>
> The cap charges past 2.7V, and keeps going to about
> 3.3V. At that point I
> stopped it since the cap is only rated at 2.5V and
> it obviously wasn't going
> to trigger anyway. The cap was also a little warm,
> but only slightly.
>
> I've checked the circuit and everthing appears to be
> right. One thing I
> wasn't sure of though is the diode. Is that a
> signal diode or a reguler
> diode? I used a signal diode cause that's all I had
> anyway.
>
> Oh, all the components are brand new except the
> diode and the cap.
>
>
=====
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12119 Sat, 18 Mar 2000 22:14:49 -0800 [alt-beam] To Invert or Not to Invert? alt-beam@egroups.com Ken Hill Is it possible to just reverse the polarity of the enables on non inverting
chip equivalents to the -240 etc. and have them operate the same? I
realize that it will "depend" on the circuit of course, but in general, how
important is it to use the correct version. (I'm asking cause I'm cheap
and have a few non-inverting ICs like -241s, -244s, -541s, I'd like to
screw up first during the learning phase :)
Thanks for any advice,
Ken
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