UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Hints, Tips and Solutions (Do NOT post requests for help here)

Notices

Hints, Tips and Solutions (Do NOT post requests for help here) If you have any useful general hints and tips for vintage technology repair and restoration, please share them here. PLEASE DO NOT POST REQUESTS FOR HELP HERE!

Closed Thread
 
Thread Tools
Old 4th Dec 2020, 5:10 pm   #1
Nymrod121
Nonode
 
Nymrod121's Avatar
 
Join Date: Apr 2012
Location: Worcestershire, UK.
Posts: 2,039
Default CR20xx cell stack holder

Apropos of nothing in particular but it might be of interest to others

Whilst pondering on making a 16.5v low power requirement supply for a voltage reference I'd built a while back, I've found that the inside of a Multicore solder reel is a perfect fit for the CR20xx range of coin cells - see pic.

I'm [low current]-ly considering how to implement a contact arrangement & will post again in a [non-short] while

Guy
Attached Thumbnails
Click image for larger version

Name:	20201204_155850.jpg
Views:	176
Size:	34.2 KB
ID:	221856  
__________________
"What a depressingly stupid machine." [Marvin: HHGTTG]
Nymrod121 is offline  
Old 4th Dec 2020, 6:17 pm   #2
Nymrod121
Nonode
 
Nymrod121's Avatar
 
Join Date: Apr 2012
Location: Worcestershire, UK.
Posts: 2,039
Default Re: CR20xx cell stack holder

Here's my best endeavours ...

I've used 5 x CR2025's having a total stack thickness of 12.2mm* with connecting straps formed from a bit of 1.2mm² FT&E earth wire; I pre-drilled 4 x 1mm holes then "bodged" them out with a tapered implement. Assembly needed care - but it seems to have been a success Now for some careful trimming of the remainder of the Multicore tube.

Guy

* For 5 x CR2032s, it's 15.65mm - as measured with a digital caliper (yes, I did indeed put some 0.05 plastic film between the stack / caliper jaws ... then deducted 0.1mm )
Attached Thumbnails
Click image for larger version

Name:	20201204_170529.jpg
Views:	143
Size:	24.9 KB
ID:	221870   Click image for larger version

Name:	20201204_170539.jpg
Views:	128
Size:	34.2 KB
ID:	221871  
__________________
"What a depressingly stupid machine." [Marvin: HHGTTG]
Nymrod121 is offline  
Old 4th Dec 2020, 9:20 pm   #3
Tyso_Bl
Hexode
 
Tyso_Bl's Avatar
 
Join Date: Jul 2014
Location: Magor, Monmouthshire, Wales, UK.
Posts: 436
Default Re: CR20xx cell stack holder

What a good idea, I like the repurposing, how have you arranged to keep the cells under compression?

T
__________________
Adapt, Improvise, Oh Bother.....
Tyso_Bl is offline  
Old 4th Dec 2020, 11:21 pm   #4
Nymrod121
Nonode
 
Nymrod121's Avatar
 
Join Date: Apr 2012
Location: Worcestershire, UK.
Posts: 2,039
Default Re: CR20xx cell stack holder

It all came down to careful measurement/positioning of the 4 holes ... having fitted one copper strap, I added the stack making sure they were 'parallel' to the diametral plane of the tube - if you see what I mean! - then whilst pushing down on the stack at the other end, I inserted the other strap. The 1.2mm² FT&E wire has sufficient stiffness to give a good contact across the faces of the cells at each end as well as maintaining sufficient compression throughout the stack to minimise the risk of iffy contact between adjacent cells.

It's nice to be able to make this up out of odds & sods (my garage is a shrine to the concept of re-purposing!) and I'll post some pics once I've added the LT1236 10.000V voltage reference chip (on a bit of Veroboard) plus an on-off switch and some proper 'test point' style sockets.

The box I'll be using was originally associated with an SES-Astra 'Point 'n' Play' two-way satellite broadband alignment meter - I had several of them left over from my rural broadband business when I closed it down in 2016

Guy
__________________
"What a depressingly stupid machine." [Marvin: HHGTTG]
Nymrod121 is offline  
Old 11th Dec 2020, 10:58 pm   #5
Nymrod121
Nonode
 
Nymrod121's Avatar
 
Join Date: Apr 2012
Location: Worcestershire, UK.
Posts: 2,039
Default Re: CR20xx cell stack holder

My handy 10.00(0) volt reference gizmo is now finished
"What fun!" *
Guy

* (as the late great Sir Terry Wogan used to say in that hysterically funny series 'Janet & John')
Attached Thumbnails
Click image for larger version

Name:	20201211_214213.jpg
Views:	103
Size:	108.4 KB
ID:	222348   Click image for larger version

Name:	20201211_214239.jpg
Views:	92
Size:	39.5 KB
ID:	222349   Click image for larger version

Name:	20201211_214312.jpg
Views:	89
Size:	43.7 KB
ID:	222350  
__________________
"What a depressingly stupid machine." [Marvin: HHGTTG]
Nymrod121 is offline  
Old 12th Dec 2020, 2:50 am   #6
emeritus
Dekatron
 
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 5,316
Default Re: CR20xx cell stack holder

I see that a new line in CPC's latest catalogue is nickel-plated steel battery spring contacts. 10 for about £1 for AA & A, 10 for about £2 for C & D cells, VAT extra. Could be useful for this sort of thing as well as repairing springs damaged by leaking alkalines. I shall include some in my next order.
emeritus is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 3:22 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.