Alt-BEAM Archive
Message #00377
To: beam@corp.sgi.com
From: "Ben Hitchcock" beh01@uow.edu.au
Date: Sun, 14 Feb 1999 15:55:50 +0000
Subject: [alt-beam] Re: solar engines
Maybe it's the internal resistance of your cap. In some of my solar
engines, they went through the cycle:
Charge up to the required voltage.
Turn the motor on...
The voltage drops straightaway, because of the load on the cap
The SE turns off.
The voltage rises back up to the switch-on level...
I tried adding smaller caps with lower internal resistances, but this will
only work if the smaller cap can get the motor moving: then the larger cap
supplies the normal 'run current'.
I got around this by lowering the switch-off voltage. I don't know which
circuit you are using, but there should be some way of lowering the
switch-off voltage. Of course, you could try using a better cap, or by
putting a smaller cap (Maybe a tantalum?) across the main storage cap's
terminals.
Ben
----------
>From: davidperry@mail.geocities.com
>To: beam@corp.sgi.com
>Subject: [alt-beam] solar engines
>Date: Wed, Feb 14, 1996, 8:28
>
>if theres one thing in beam that i can't screw up in BEAM it's making
>a solar engines, i make true junk ones, 1 plain old LED 2 transistors
>and a resistor, very tiny freeformed. But the problem is with motors
>with the danged capacitator in them. I'm making some sun chimes and
>they work great except the motor just oscillates, is there a simple
>way of overcoming this other than by using the suneater circuit?
>By the way, with the photovore im getting voltage on the middle and
>right pins but still nothing, so i suppose its the solarengine, does
>it matter that i used BC type transitors instead of the 2n3906?
>(flipped around of course).
>regards,
>David Perry
>
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