Alt-BEAM Archive

Message #03054



To: James Anderson anderson@cfht.hawaii.edu, beam beam@corp.sgi.com
From: Dennison dennlill@buffnet.net
Date: Thu, 6 May 1999 19:16:01 -0400
Subject: [alt-beam] Re: Transistor Backwards?step by step FLED SE analysis ( was F#$@ beam)


I just read the Tilden Lecture notes, and one thing Tilden say's is that
some SE schematics on the web have a transistor facing the wrong way.

Dennison


>As a struggling newbie, I certainly do. And if one of yous smart peoples
wanna
>add reasons for why each step wouldn't work (and what to do about it), that
>would be very nice.
>
>Wondering Aimlessly,
>James
>
>"van Zoelen, Bram SSI-TSEA-352" wrote:
>
>> I think this is worth to add to the FAQ
>>
>> Agree?
>>
>> Bram
>>
>> > ----------
>> > From: Wilf Rigter[SMTP:Wilf.Rigter@powertech.bc.ca]
>> > Reply To: Wilf Rigter
>> > Sent: Thursday, May 06, 1999 3:52 AM
>> > To: 'Bumper314@aol.com'; beam@corp.sgi.com
>> > Subject: step by step FLED SE analysis ( was RE: F#$@ beam)
>> >
>> > <>
>> > Hi Steve,
>> >
>> > perhaps you can check one part at a time as you assemble the whole SE
and
>> > report what you find.
>> > On the attached schematic, what values for C1 and R1, what motor and
solar
>> > cell? : so we can compare notes.
>> >
>> > Here are some suggestions for checking each part/step along the way.
>> >
>> > 1. check the (illuminated) solar cell output (unconnected): 3-5V?
>> > 2. add the cap, charge and measure the voltage: 3-5V?
>> > 3. touch FLED across the cap: does it flash?
>> > 4. charge cap and touch motor across cap: does it turn?
>> > 5. connect 2N3904 and the motor across cap, charge cap, then touch a
330
>> > ohm
>> > resistor between 2N3904 base and +V : motor turns/moves?
>> > 6. add the 2N3906 and resistor, then touch a 1K resistor between the
>> > 2N3906
>> > base and 0V : motor turns/moves?
>> > 7. add FLED, if circuit not working: touch 1K resistor between between
>> > the
>> > 2N3906 base and 0V : motor turns/moves?
>> >
>> > let us know where you get stuck.
>> >
>> > (try to) enjoy
>> >
>> > <>
>> >
>> > Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
>> > tel: (604)590-7493
>> > fax: (604)590-3411
>> >
>> > > -----Original Message-----
>> > > From: Bumper314@aol.com [SMTP:Bumper314@aol.com]
>> > > Sent: Wednesday, May 05, 1999 5:02 PM
>> > > To: swilliam@cadvision.com; beam@corp.sgi.com
>> > > Subject: Re: F#$@ 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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