[KLQRP] A Knightlite challenge

[Bob Kellogg]

Gary, et al,

As Derek said, the Harbor freight site is:
http://www.harborfreight.com <http://www.harborfreight.com/>  


The item number is: 90899

They also have one for a dollar or two more that has a backlit LCD.  I think it uses the same board with some more parts on it, so that one will work for our challenge, also.



Gary Oneil wrote:
> Greetings Sir Bob;
>
>         Can you point us to a url where we can stare at one of these in 
> advance of the QRPigOut... Some of us can't think as fast on our feet, and 
> need some time to ponder ideas of how to put them to good use.  :-)
>
> 72
>
> Regards;
>
> Gary E. O'Neil
> Nova x4  Usage & Applications
> PPC Applications Engineering
> 3039 Cornwallis Road, 062/E112
> Research Triangle Park, NC  27709
>  
> Home Office:   (919)-859-4902
>    RTP Office:   (919)-543-5750    T/L 441-5750
>     Cellphone:   (919)-522-5460
>
> A good writer never loses his readers until he loses his critics.
>
>
>
> Bob Kellogg <ae4ic at infionline.net> 
> Sent by: klqrp-bounces at knightlites.org
> 03/09/2008 07:30 PM
> Please respond to
> ae4ic at infionline.net
>
>
> To
> KLQRP <klqrp at knightlites.org>
> cc
>
> Subject
> [KLQRP] A Knightlite challenge
>
>
>
>
>
>
> Guys,
>
> I just bought some 3-1/2 digit multimeters from Harbor Freight.  These 
> meters are just crying to be reworked.  They were cheap and they contain 
> all of the electronics needed to make at least the following panel meters:
>
> DC Voltmeters,  1000V, 200V, 20V, 2000mV, 200mV
> AC Voltmeters, 750 V, 200V
> DC Ammeters, 10A, 200mA, 20mA, 2000uA, 200uA
>
> Of course, the meters also measure resistance, but I can't think of a 
> panel meter that needs that capability.
>
> Anyway, here's the Knightlite challenge:  Design a slick rework to 
> convert the  Multimeter to a panel meter.  (now, I know we could just 
> mount the whole meter to the front of a panel, but that won't count.  We 
> need to just have the LCD showing on the panel)
>
> I'll bring some multimeters to the next QRPigOut (Thursday, March 20) 
> and anyone who accepts the challenge will get a free meter to work with.
>
> A couple of notes to our far flung Knightlites who may buy their own 
> meters:
> The rotary switch mechanism has two small spring loaded ball bearings 
> which can be easily lost.  They are between the rotating part of the 
> switch and the case.
> All parts, including the contacts for all switches and the LCD, are on 
> the circuit board, which is actually a two part double sided board.
>
>   

-- 
Best Wishes,

Bob Kellogg, AE4IC
Greensboro, NC
Prolably, not nececelery - Benny Hill