Ultrasonic transducer time of flight - Page 2 - Electronic Circuits Projects Diagrams Free

ericgibbs · 4th July 2009, 04:07 PM

Quote:

Originally Posted by hash

Hmm... I don't think it's that, it's like a value or something... Could it mean they're not present, like not connected? I see them in circuits that could have a dual purpose, but I don't have the board at hand to check. I'm attaching a couple of pictures from the datasheet.

hi,
Looking at the drawings you have posted, non inductive resistors would make some sense in those locations.

Ive never seen or used NL to indicate an optional resistor, ie: used or not

hash · 4th July 2009, 04:22 PM

Well if those are non inductive resistors, what's their value? There's nothing in the datasheet to indicate what they are...

Edit:
I think I've discovered what they are. Could NL mean 'no load'? There are a bunch of expansion connectors tied with corresponding ports through 'no load' resistors, though I can't say I've seen so many resistors on the board itself...

Edit2:
I give up

I've just seen a 'NL' capacitor, whatever that could mean...
Here's the link to the datasheet itself, the schematics are at the end"
http://ww1.microchip.com/downloads/e...e%2051589a.pdf

ericgibbs · 4th July 2009, 05:31 PM

Quote:

Originally Posted by hash

Well if those are non inductive resistors, what's their value? There's nothing in the datasheet to indicate what they are...

Edit:
I think I've discovered what they are. Could NL mean 'no load'? There are a bunch of expansion connectors tied with corresponding ports through 'no load' resistors, though I can't say I've seen so many resistors on the board itself...

Edit2:
I give up

I've just seen a 'NL' capacitor, whatever that could mean...
Here's the link to the datasheet itself, the schematics are at the end"
http://ww1.microchip.com/downloads/e...e%2051589a.pdf

A resistor with '0' value is just a wire link.

Circuit boards often use links that are connected or not in order to select different options regarding the operation of the circuit.

Some board use 'jumpers' either wire links or mini-connectors.

EDIT:
I have looked all the way thru that Explorer 16 documentation and I cannot find any explanation for 'NL' .
Ive even been searching the microcip website,, no luck.

I would recommend that you email microchips technical help for an explanation. If you find out I would like to know.

The hardware documentation, IMHO for the Exp 16 is awful!!

hash · 4th July 2009, 05:51 PM

Yes, the 0 ohm resistors are just connections, the 'NL' thing is what's confusing me. Anyway, I'll take a closer look at the board on monday when I get to college and I'll let you know what I find. Thank you again for your insight, it's been very helpful.

hash · 7th July 2009, 10:19 PM

Today I've taken a closer look at the board. There are a lot of 3-pad parts. The first two pads are linked with a copper trace and correspond to the '0R' resistors and the middle and last pad are left unconnected and the markings are those of the 'NL' resistors. These seem to be 'optional' features that the user might want to change. Why 'NL'... possibly from 'no load', it's strange anyway

ericgibbs · 8th July 2009, 07:57 AM

Quote:

Originally Posted by hash

Today I've taken a closer look at the board. There are a lot of 3-pad parts. The first two pads are linked with a copper trace and correspond to the '0R' resistors and the middle and last pad are left unconnected and the markings are those of the 'NL' resistors. These seem to be 'optional' features that the user might want to change. Why 'NL'... possibly from 'no load', it's strange anyway

hi,
Thanks for the feedback.

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4th July 2009, 04:22 PM	#17
hash	Well if those are non inductive resistors, what's their value? There's nothing in the datasheet to indicate what they are... Edit: I think I've discovered what they are. Could NL mean 'no load'? There are a bunch of expansion connectors tied with corresponding ports through 'no load' resistors, though I can't say I've seen so many resistors on the board itself... Edit2: I give up I've just seen a 'NL' capacitor, whatever that could mean... Here's the link to the datasheet itself, the schematics are at the end" http://ww1.microchip.com/downloads/e...e%2051589a.pdf Attached Thumbnails Last edited by hash; 4th July 2009 at 04:30 PM.

4th July 2009, 05:51 PM	#19
hash	Yes, the 0 ohm resistors are just connections, the 'NL' thing is what's confusing me. Anyway, I'll take a closer look at the board on monday when I get to college and I'll let you know what I find. Thank you again for your insight, it's been very helpful.

7th July 2009, 10:19 PM	#20
hash	Today I've taken a closer look at the board. There are a lot of 3-pad parts. The first two pads are linked with a copper trace and correspond to the '0R' resistors and the middle and last pad are left unconnected and the markings are those of the 'NL' resistors. These seem to be 'optional' features that the user might want to change. Why 'NL'... possibly from 'no load', it's strange anyway