This page created 04-18-2001

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Kilian's Robot Shop of Horrors - 04/13/2001

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Subject: [TCRG] RSOH last nigt.
Date: Sat, 14 Apr 2001 13:35:33 -0500 (CDT)
From: Alan Kilian
To: (Twin Cities Robots group)

All I can say is 5:00 AM is too late to get to bed.

Brynn brought over all his beautiful tiny circuitboards. He had 16 boards made at AP Circuits in Canada for $110 (If you subtract the quick shipping charge and non-standard drill size charge)

They look really nice. mostly surfacemount chips, resistors and everything.

We tried to get two PIN photodiode reciever boards to work, and couldn't really get either of them to work. PIN diodes in backwards at one point, Something called Positive ECL (Which I don't understand) One time he almost burned his finger on the amplifier chip. A bad sign.

Jeff M and Jeff S. had some good talks about how to drive power transistors with a smaller transistor to get a pile of current to drive a stepper motor.

Lots of talk about how to cool semiconductors. Is a silpad insulator and grease the best you can do? How about mica washers? Why do MOSFETS get as hot as they do? Man 6 Watts doesn't sound like a lot, but it sure makes a transistor without a heatsink unhappy.

We drove Jeff S's "go cart" around in the dark street. It goes just fine on 24 Volts, but Brynn rode it at 48 Volts!! Man he was moving. I'll let Jeff describe it.

Next week I'll try to have a PIN photodiode amplifier built from a schematic I found on that old InternetWebCommerceEbusiness thingie.


Brynn's Tryclops

Brynn's Tryclops
Inside view
New motor driver board
New interface board
Optical receiver


A $5 motor from Axman
The planetary gears
Alan decided it was too noisy
so he packed it full of
Jeff Martin had this linear
actuator machined up
Jeff Martin's collection of
parts from Axman
Jeff Martin is working with
another guy to create a robot
arm using these parts


Looking at one of Brynn's
camera pictures on the TV
A picture of the go-cart

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