This page is under construction last update 22-11-'97 4:18:21

Page Statistic's
Go back to my Homepage
Go back to the clock

A clock made by Andrew Jardine

He got some nifty improvement's

Like Battery time backup and using a ball bearring as slipring!

And i think there's a lot more comming !?


Click image to enlarge!

Date: Wed, 19 Nov 1997 12:04:03 -0800
From: Andrew Jardine
Reply-To: a.r.jardine@swansea.ac.uk
To: Luberth@wxs.nl
CC: bob@ted.net
Subject: Re: prop clock!
Hi Luberth,I'm sending you the GIF of the circuit mods as promised, and alse CCing them to Bob (Hi Bob). It's only thrown together and I welcome comments - I'v just noticed components unmarked (r?) for example - I'll re-draw it. Explanations: the zener diode d2 and Q1 switch off power to the hall sensor when the voltage is less than 4.5V - the pic takes 1ma and the hall sensor takes 5ma! the little nicad then lasts a couple of days. With the clock running (including motor) mine takes half an amp. Most of the noise with the clock is due to air through the LEDS and other components. If I ever get time I may try to re-do the PCB in surface-mount could be quite neat. It will be worth using those mega-bright rectangular LEDS - the digits look MUCH better with all bits of the segments joined together.(I tried but my rectangular leds were too dim) Re. putting this on your web page Luberth, No problems, (but I would like to see my name there somewhere !) Catch you later,
Cheers, Andrew.

Subject: Re: prop clock!
Date: Fri, 21 Nov 1997 16:08:42 -0800
From: Andrew Jardine
Organization: Swansea University
To: Luberth@wxs.nl
Hi Luberth
Good news,
I found out today that the simple small bearings (as I pulled out of a floppy disk drive) are not stainless steel ! - You can solder to them !! I have anclosed a little GIF of the wires soldered to a bearing, the actual bearing being 8mm across. It works beautfully. Sorry I haven't been able to photograph the finished article, I've been very busy here.Talk to you next week,
Cheers, Andrew.
Bearring with wires soldered on to it!


Special thank's goto

Andrew Jardine

Go back to my Homepage
Go back to the clock

End of File