Alt-BEAM Archive
Message #09169
To: beam@sgiblab.sgi.com
From: "Ben Hitchcock" beh01@uow.edu.au
Date: Fri, 14 Jan 2000 13:45:42 +1100
Subject: [alt-beam] Re: FLED issues
Hi,
>From: Jonathan D Rogers
>Date: Fri, 14 Jan 2000 10:29
> OK, Ben, I tried e-mailing your address but I got a "no service" message.
> I have a couple of questions:
> Is it necessary that the two 4.7uF caps be tantalum? I was using
> electrolytic.
No, they can be whatever you like. If you are using electrolytic, then make
sure the + end is attached to the base of the PNP transistor.
If you have some smaller caps (so long as they are equal to or above 0.1 uF)
then they should work as well. I'm thinking here of some 0.22 uF ceramic
caps you may have lying around waiting for a microcore to put them in.
> Also, is it OK to substitute other transistors as long as they're
> standard PNP/NPN?
Sure - so long as the gain is reasonably high. (200 or higher). This is
the hFE value given in the spec sheets.
You said that the circuit worked on the breadboard, so your transistors
should be fine.
If you do decide to experiment around with various transistors, breadboard
the circuit first to make sure that it works. You only need to breadboard
one side of the circuit, though.
Ben
9170 Thu, 13 Jan 2000 22:12:19 EST [alt-beam] Re: does anyone know where those single inverters can be found? beam@sgiblab.sgi.com Meabadboy@aol.com I found this link for them ~
http://www.fairchildsemi.com/search/search.cgi/design?keywords=TinyLogic&x=49&
y=18
not a bad price
dont understand why you say they cannot be free formed though??
Steve
9171 Thu, 13 Jan 2000 19:23:52 -0700 [alt-beam] Re: Nihon Motors beam@sgiblab.sgi.com Senior Well, from what company were you thinking of ordering?
!
-Kyle
Max Inggal wrote:
>
> What's the item number for the Zoom lens thing that
> has 2 Nihon Motors for 30 bucks.
> __________________________________________________
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> Talk to your friends online with Yahoo! Messenger.
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9172 Thu, 13 Jan 2000 22:48:30 -0500 [alt-beam] Re: does anyone know where those single inverters can be found? "Dennison Bertram" Not a bad price? Perhaps not, but considering how cheap the 74hc14 is, it's
expensive. :-)
dennison
I found this link for them ~
http://www.fairchildsemi.com/search/search.cgi/design?keywords=TinyLogic&x=4
9&
y=18
not a bad price
dont understand why you say they cannot be free formed though??
Steve
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