Alt-BEAM Archive

Message #03009



To: "'Bumper314@aol.com'" Bumper314@aol.com, beam@corp.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Wed, 5 May 1999 18:52:22 -0700
Subject: [alt-beam] Re: step by step FLED SE analysis ( was F#$@ beam)



content-type: text/plain

Hi Steve,

perhaps you can check one part at a time as you assemble the whole SE and
report what you find.
On the attached schematic, what values for C1 and R1, what motor and solar
cell? : so we can compare notes.

Here are some suggestions for checking each part/step along the way.

1. check the (illuminated) solar cell output (unconnected): 3-5V?
2. add the cap, charge and measure the voltage: 3-5V?
3. touch FLED across the cap: does it flash?
4. charge cap and touch motor across cap: does it turn?
5. connect 2N3904 and the motor across cap, charge cap, then touch a 330 ohm
resistor between 2N3904 base and +V : motor turns/moves?
6. add the 2N3906 and resistor, then touch a 1K resistor between the 2N3906
base and 0V : motor turns/moves?
7. add FLED, if circuit not working: touch 1K resistor between between the
2N3906 base and 0V : motor turns/moves?

let us know where you get stuck.

(try to) enjoy

<>

Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411

> -----Original Message-----
> From: Bumper314@aol.com [SMTP:Bumper314@aol.com]
> Sent: Wednesday, May 05, 1999 5:02 PM
> To: swilliam@cadvision.com; beam@corp.sgi.com
> Subject: Re: F#$@ beam
>
> In a message dated 5/5/99 4:58:02 PM Pacific Daylight Time,
> swilliam@cadvision.com writes:
>
> > maybe it has to do with that little problem that seems to come up a lot,
> > just having enough voltage to keep the latch on, so it can not
> recharge, or
> > something like that, try your SE's under different light conditions.
>
> done that too, I have tried 55W and 65W incondesent, i tried a 40w halogen
>
> lamp, a halogen 4 D battery mag light, 75W halogen flood light, and of
> course, the sun...
> STeve


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Attachment: FLEDSE.gif

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