04628 [alt-beam] Re: Where to find parts in Common Items [walkmen, junk electronics

Alt-BEAM Archive

Message #04628

To: beam@sgiblab.sgi.com
From: Don Papp donp@cronus.oanet.com
Date: Fri, 18 Jun 1999 09:21:05 -0600 (MDT)
Subject: [alt-beam] Re: Where to find parts in Common Items [walkmen, junk electronics

On Thu, 17 Jun 1999, BEAM Robotics wrote:

> Panasonic 1381J 2.6V-2.9V Voltage detectors

These are specialized parts that you won't find at garden-variety
electronics places; nor in things like walkmans. You can order them from
Solarbotics (www.solarbotics.com) or Digi-Key (www.digi-key.com)

> Photodiodes ( I did find something at shack Cat# 276-145A Infrared
> Phototransistor, will these work at all?)

They won't work the same if that's what you mean. By all means
plug them in to see what they do, but the part listed for the photovore is
a photo_DIODE_ and you bought a photo_TRANSISTOR_. Diodes and
transistors are not the same.

Photodiodes might be found in walkmans or disk drives (the sensor
to detect write-protect or cassette loaded).. or are those more commonly
phototransistors? Anyone?

> 2N3904 NPN transistors (found MPS3904 transistors at shack, not sure if they
> are the same?)
> 2N3906 PNP transistors
> 100K ohm potentiometer ( found PCB mount Micro ones Will they work?)

These are all fine.

> Solarcell ... (all they had were .45v solar cells..)

You can use at least 8-10 photodiodes linked together to act like
a solarcell, but if you're having trouble finding photodiodes in the first
place, that won't help you.

If you have .45V solarcells, you will need 6-7 or so of them in
series to give you at least 3 volts.

Very good solar cells can be found at Solarbotics.
(www.solarbotics.com) Not sure where else you'd get some, unless there is
a surplus place around near you that may have something solarpowered you
could take the cell off of.

| Donald Papp, T.T., MCP
| Support Analyst
| OA Internet Inc.
| don@oa.net

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