MR-9 Adapter 1.55V to 1.35V

[Brad Deputy]

From Kanto Camera.

 

[BrianShaw]

The adapters I bought from CrisCam look the same and work in a Ricoh TLS. I’m wondering if these look the same and are possibly different or if different cameras aren’t completely compatible with them. I’ve been lucky, it seems.

 

[Brad Deputy]

I got mine off eBay.

 

[benjiboy]

I noticed that the O.P's conclusions are not based yet on actually shooting any film, I suggest he does so before becoming to any.

 

[benjiboy]

Has anyone had any experience with this adapter?

I recently purchased one and prior to install it in one of my cameras I tried to measure the voltage with a voltimeter:

View attachment 341304

But I cannot see such voltage reduction.

Looking carefully at the manufacturer site (http://www.kantocamera.com/english/adapter/adapter_en.html) there is a disclaimer that reads:



I then tried that also:

View attachment 341305

Without better results...

Maybe is only when installed in the camera when the voltage conversion will take place correctly due having an actual load?

You need to check the voltage with the battery installed in the MR 9 adapter.

 

[BobUK]

You mean he should measure the battery with just the 10kOhm load, then measure it with the 10kOhm load and the MR-9 adapter, and compare the difference, right?

https://buhla.de/Foto/batt-adapt-US.pdf

The first paragraph on page 5 explains. The adaptor plus the resistor are required to measure the output.

I have made a few adaptors in the past using the information in the article linked above,
and they have worked well for me.

They are fiddly to make. I did fry a couple of diodes until I got the hang of it.

 

[Martin C]

Just to reiterate, as long as your camera presents a resistance under 10k Ohms the Kanto adapters will work. If the resistance is above that they will not. In that case use a dumb adapter and just fit a zinc air battery.

 

[koraks]

The first paragraph on page 5 explains.

I understand the electronics. Please read back what I responded to (almost a year ago!) and what the measurement problem was that was pointed out. The problem outlined was that OP measured the bare battery in one test and then the battery + series diode + load resistor in the second test. The lower voltage across the adapter contacts (not the battery contacts) is the combination of the load and the series pass diode. There was some discussion about the role of the load vs. that of the diode and the measurement didn't differentiate between the two. I asked for clarification because the problem was pointed out, but not made explicit.