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Astir

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Posts: 2
Reply with quote  #1 
I have a problem with the ultrasonic kit20.
The documentation says the polarity is important on the receiver but I can't find any information on wich of the pins are ground and not.
It says one of them should be connected to the metal case of the receiver but it seems I haven't even got the correct one.


Above image is taken with a really crappy iPhone but it says:
400SR
7 39
This if the one that is supposed to be in the kit:

Bottom right corner(RX) is where the 400RS go.
Quote:

2. Make sure to connect the earth/case Rx sensor pin (it
is the pin which is connected to the metal case) to the
earth pad of the 'TO RECEIVER' pads on the main
circuit board. The earth pad is marked with an E. The
polarity of the Tx unit is not important in this circuit. It
can be connected either way around.


Quote:
If they are mixed up then damage to the receiver
unit will probably result.


Documentation: http://www.kitsrus.com/pdf/k20.pdf

Frank

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Posts: 1,885
Reply with quote  #2 
You have been supplied the correct transducer. The trouble is that it is a newer version and the physical 'look' has changed.

My guess is that the pin below the '7 39' marking is the ground pin.

I will check with the kit manufacturer and ask if they have (or can get) a datasheet on this later version.

Frank

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Posts: 1,885
Reply with quote  #3 
I have received the datasheet for these transducers. Looks like they are non-polarised types, which means it doesn't matter which way around you insert them.

I have uploaded the datasheet for reference.

 
Attached Files
pdf 400STR16M.pdf (55.34 KB, 1406 views)

Astir

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Posts: 2
Reply with quote  #4 
Quote:
Originally Posted by Frank
I have received the datasheet for these transducers. Looks like they are non-polarised types, which means it doesn't matter which way around you insert them.

I have uploaded the datasheet for reference.



Thank you very much.
I'm gonna assume anyway that the top pin in my picture is the positive. It should be so when looking at the previus version of the transducer.

I'll let you know if it worked or not... will not be until friday though when we can test this properly in the lab.

-edit-
It worked perfect. I just assumed that the top pin was the positive one, never tried the other way around.
Thank you for digging out the datasheet.
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