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Hi all,

I've picked up a 5S14N.
<insert childish bouncing & vocalizations>

Not surprisingly, it has dead bias cells in one channel. (Or: surprisingly, it has good bias cells in one channel.) Replacement remains a work in progress but I thought this might be generally useful.

The four through-holes for the two cells align to a 0.1" grid and have enough space around then to fit a bit of PTH perfboard to build on.

/g/TekScopes/album?id=270597

Great idea; it takes space, though, if you plan to use battery cells; helpful for LED-LED solution, can be done easier off site...
TT

P.S. I posted this message here earlier, but I found it in another topic; maybe it was my mistake (not sure how)

Hi TT,

Great idea;

Thanks!

can be done easier off site...

I think you mean constructing something safely separate from the sampler board then simply attaching a finished widget to the sampler. Yes! And there's nothing on the back of the sampler board to hurt while soldering four (could be three) through-holes pins. And the existing cell tabs -- mine had flat ribbons soldered on top the through-hole pads which I think is normal -- can be desoldered by heat from the back too.

Given reports that 1.55V silver oxide cells work, I plan to try a pair of LR44/357/1154 cell retainer clips on that gerrymander of perf board. But parts in the mail so no result yet.

I wonder if the LED-LED solution with work with side-firing SMD LEDs, which could make a very tidy package -- and probably fit on a more simply shaped bit of perf than my example. But if making Ag cells simple to replace works out, I'll likely not ever get around to trying the LEDs myself.

Hi Paul,
You got my idea right; years ago (I believe more than 10) I bought two non working 7S14 for a total of $30, one came totally dismantled (as far as I can say, though, nothing is missing).
Non working condition was, of course, due to battery cells. In fact what I found inside were regular 1.5V button battery cells (and probably replaced not only once), no sign of initial mercury cells.
The one that I restored works fine today (you have to do the normal calibration, or, at least, check and adjust balance).
Your idea with side emitting LEDs is good, but might need more attention with alignment.
Good luck with whatever solution you chose to apply; let us know your results
TT

Ok - got parts, made a thing, added pics to album. In this case: a pair of SR44 button cell "retainers".

(apparently a "holder" is a complete unit while the plain metal clips that capture the pos. cell body over an assumed neg. contact pad on the PCB are called "retainers". things I didn't know I didn't know...)

For simplicity, I wanted to do something like the cell holders shown in the picture from Stefan at the bottom of Ralf Ohmberger's 7S14 page:

Cell holders I found that looked like that there were sized for relatively thin 12mm cells like 1225, and the photo shows 389 cells which are 11.6 x 3.05mm rather than the common 11.6 x 5.4mm SR44/"LR44"/1154/357 cells. The "LR44" retainers were simple to obtain quickly and retain the thicker cells without adding thickness for a plastic "holder" body when attached to a PCB. So I went that way instead.

If I had a 1225 holder in hand I probably would have tried a CR1225 lithium cell + resistive divider (and caps). But while years of capacity and ubiquitous availability make that sound like a good idea with a bigger CR2032 cell, the smaller capacity of a less common 1225 (or two) diminished my motivation to find parts for that. And I didn't find a way to fit a CR2032 holder/retainer in the available space. (~10.2mm/0.40in between sampler board and cover, by the way)

The album is open for anyone to add photos, so please feel free to add other ideas for taking advantage of the 0.1" grid alignment.