Roberts R66

[LyntonP]

AVO battery completed. Piece of plastic trunking and two spacers made from dowel with a brass screw though. Coin cells held tight. Fits in well.
Lynton

[Refugee]

I made my AVO 15 volt batteries from five 3 volt CR2032 coin cells stacked with a 15mm water pipe stop end with a bit of tape wound around to hold it together.

You must start a new thread to discuss your mystical properties!

In the meantime, pray tell how you get 20mm diameter cells to fit into a hole designed to take a 15mm pipe.

The myths start but if you use a second hand stop end.
If the pipe had water in it then wet cells are needed and you need to open the battery compartment with a water screwdriver to fit it.
If you use a new stop end you can only fit dry cells and the battery cover has to be fitted with drywall screws.
If the stop end came from a gas pipe then life will be a gas and a safety police inspection will be needed.

[ppppenguin]

That's a conduit fitting, not a trunking fitting, but otherwise a neat bit of improvisation.

[Refugee]

It looks like the fitting used where the duct goes into a box.

[ppppenguin]

Correct.

[Terry]

You must start a new thread to discuss your mystical properties!

In the meantime, pray tell how you get 20mm diameter cells to fit into a hole designed to take a 15mm pipe.

You need to look at the component parts of a compression fitting 15mm stop end....

Ah, yes, I think I can see what I overlooked.

I must admit that I wrote my previous post in a bit of a hurry before I dashed off for a clinic appointment. In my rush I also left of the smiley I was intending to add, so I'll rectify that now ...

[LyntonP]

The selenium rectifier which started all this discussion has some identification numbers. Maybe someone knows what this means?
STC D57 F8 1634A. The last digit 'A' may be a triangle? Difficult to distinguish.
Any ideas?
Lynton

[Refugee]

That is a very impressive smiley
Does that rectifier contain just HT diodes or LT diodes or some combination. It does not look obvious to me from the photos of the wiring.
Once we have established what mythical properties apply to the stop end to be used in an AVO battery we need to work out what the polarity of the stop end must be and why?
There is a right and wrong way to put the stack of cells together to make the battery and a reason for it. From this you get the polarity of the stop end itself.
Another photo

[LyntonP]

That's a conduit fitting, not a trunking fitting, but otherwise a neat bit of improvisation.

It Was a short piece of plastic tube I found in the bits and pieces draw which after a little internal boring on the centre lathe fitted the coin cells very well. The dowel came from an old cricket stump and the brass screws were M4 which threaded into the dowel quite nicely giving good tension on the coin cells. I could have spent more time sourcing plastic inserts but it does the job!
Conduit, tube, trunkiing does it really matter?
Lynton

[Terry]

Does that rectifier contain just HT diodes or LT diodes or some combination. It does not look obvious to me from the photos of the wiring.

There is a picture in  Post #20 that I missed earlier which makes things much clearer. The three connections on the right are the bi-phase LT rectifier and the two on the left are the mysterious LT protection diode . There is no connection between this and the HT - which hasn't even been mentioned in this thread, as far as I know!

Once we have established what mythical properties apply to the stop end to be used in an AVO battery ...

Lawrence's reply made me realise that there was something I'd overlooked about the interior space available inside a compression fitting but I'm still puzzled. A stack of 5 CR2032 cells is 16mm high and I would have expected that this would exceed the space available inside the fitting which can accept something much greater than 15mm in diameter.

I dare say that if I spent the rest of the day searching through the boxes and crates of what my wife calls my 'stuff' which have been in the garage since our move - a serious downsize - I should be able to find a compression fitting or two to inspect in detail but, to be honest, I can find more creative ways to spend my day!

Conduit, tube, trunking does it really matter?

No! Of course not!