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WTB: Turbo LED display / board

S

simplex

Experienced Member
Joined
Mar 12, 2014
Messages
171
After frying my "jumperless" LED board, I am now without a Turbo LED display.

2 or 3 digit is fine, all I want is to display HI / LO anyway

I am in UK if that affects anything but will happily buy from anywhere if the price is reasonable
 
modem7 said:
Per [here], there are two broad types: 'switch input' and 'LED drive' input.
Which one are you after ?
Click to expand...

I would be happy with either type really. I'm not sure what my original one was, because nothing I did made it work properly. :cool:
 
simplex said:
I would be happy with either type really.
Click to expand...
The norm is to work out which of the two situations shown [here] is the case, then get the applicable type.

The distinction is that one type is controlled by a switched voltage being applied to the control pins, and the other type controlled by the control pins being closed circuit or open circuit via a switch.

If the wrong type is used, it cannot be expected that the LED board will switch states. In the case of a switched voltage being applied to the control pins of a 'turbo switch' type, damage may result (depending on the engineering).
 
I actually have a few of those lying around, but I don't know which type they are (re the document provided by modem7). How can one tell one type from the other looking only to the led board?

Update: added pictures
image.jpg
image.jpg
 
Last edited:
..and if you don't like any of the ones you can find, they're simple enough to build, using some perfbord and a 2- or 3-digit LED display and a few odds and ends.
 
SParent said:
I actually have a few of those lying around, but I don't know which type they are (re the document provided by modem7). How can one tell one type from the other looking only to the led board?
Click to expand...
If the maker's documentation is not available, then it gets tricky.
If three of the pins on the unit are marked L, C, and H (low/common/high) and are grouped togther in that order, then that is a good sign of a switch-input type.
If the unit has an optoisolator (the Q1 in the SD-403 circuit diagram at [here]), then that is a good sign of a LED-drive type.
 
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