[chbot] Random component give away. V 1.0

Thu Apr 26 01:21:08 BST 2012

Hi Richard.

I was thinking it might get that way actually, I'll have another go at it tonight and see how much stuff is actually usable vs product specific.  Can I drop a box off to someone on the port hills side of the city?  My Mondays are all full up for the next few months with another club commitment.

FYI, The model down alarms used a electromechanical pager speaker rather than a piezo, which was the result of quite a painful and long development process.

The trick was the sweeping tones going through the resonant point and two harmonics of the speaker. Manufacturing tolerances were not great on the speakers unless we spent five times as much per unit so the sweeping tone made up for the difference in individual units.

Pretty much all of our competitors switched to pager speakers after ours had been on the market for a while but few of them seemed to grasp why we made the tones sweeping and even now 'better' LMA's seem to be really quiet in comparison.

I've still got a few of those wee speakers as well but I'm hanging on to them for my own slope models. :-)   I did however chuck out a couple of thousand PCB's for the model down alarms last week.  Just before I sold the rights to the design I ordered a large batch of panelised boards out of china.

I do wonder how many of those alarms are still going, we used a cheap tantalum cap on many of them.  The oldest will be coming up to 15 years old now, which must be around the right age for cheap tantalums to fail and short out the radio battery just at the wrong moment!  :-)  (You might wanna check yours if you're still using it!)

Cheers, Me.

-----Original Message-----
From: "Richard Jones" <rjtp at ihug.co.nz>
Sent: Thursday, 26 April, 2012 08:31
To: "Christchurch Robotics" <chchrobotics at lists.linuxnut.co.nz>
Subject: Re: [chbot] Random component give away. V 1.0

Chris,
Sounds like we might have an opportunity for a club component box if you would like to offload a single boxfull in one hit. I'm quite happy to bring a large box along to meetings for folks to sort through. As for the piezo devices, I can attest to Ohmark lost model alarm effectiveness having saved my model gliders from loss on the port hills many, many times :-)
Sitting under my desk at work is another large box of optical mice. No doubt some working and some not. Feel free to contact me via the list if you need one or more before our next meeting on 21st May.
Richard

On Wed, Apr 25, 2012 at 11:07 PM, Chris Hellyar <[mailto:chris at trash.co.nz] chris at trash.co.nz> wrote:
ROFL...

 Your eye sight is better than mine, and I had the jar in front of me!!!  They are indeed 100k.  :-)

 I've got 1000's of IC's I need to go through but 99% of them will be factory burnt one-shot PIC's but there might be some other stuff.

 Cheers, Me.

 On 25/04/12 22:57, william wrote:
i think they are actually 100k resistor packages, i read a 104 on one of the devices at the top of the jar
 i might consider taking a few of those piezo speakers (or the whole jar)
 let us know what other stuff you have, any semiconductors/IC's/LED's etc.
 if you have any shift registers and 8 output open collector transistor packages in amongst the stuff (or UCN5841's preferably, basically the two combined) give me a yell

 -----Original Message----- From: Chris Hellyar
 Sent: Wednesday, April 25, 2012 9:21 PM
 To: Christchurch Robotics
 Subject: [chbot] Random component give away. V 1.0

 Hi,

 I'm cleaning out the workshop and slowly picking through all the
 component stocks from the old business.  I thought I'd post some of the
 stuff I have no need for here to see if anyone wants it.

 First up I've got a jar full of 10k 6 way (7 pin) sil resistors,
 probably 2 thousand or so, maybe?  Dunno.  Not gonna count em. :-)

 3/4 of the same sized jar full of piezo speakers.

 per:

[http://logicalit.biz/forumimages/120452piezo.jpg] http://logicalit.biz/ forumimages/120452piezo.jpg
[http://logicalit.biz/forumimages/120425sil.jpg] http://logicalit.biz/ forumimages/120425sil.jpg

 Lemme know if you're interested in either.

 I've gotta clean out 15 years worth of electronics 'stuff' over the next
 few weeks so I'll probably post some more items soon. :-)

 Cheers, Chris H.

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