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ArcticMyst Security by Avery
Dodggy TTL
- Thread starter FokoF
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FokoF
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YES PLEASE!!!! ;D
FokoF
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Does it work? ;D Tested my DMX board TTL output. its very erratic, very! :'( will build the amp and see what happens. Thanks!
PS. are those two grounds connected to -5V or the scanner PSU ground?????
And R1 and R4 what are the the resistances? 4k7????
PS. are those two grounds connected to -5V or the scanner PSU ground?????
And R1 and R4 what are the the resistances? 4k7????
hey, I just tried this circuit and it works perfectly!
The only modification I had to make was a pot over R5, to adjust the brightness.
The grounds are connected to - of the 5V
the 4K7 resistors are 4.7K resistors. Most electronics shops label them as 4K7 on the box, so not a big problem.
The only modification I had to make was a pot over R5, to adjust the brightness.
The grounds are connected to - of the 5V
the 4K7 resistors are 4.7K resistors. Most electronics shops label them as 4K7 on the box, so not a big problem.
FokoF
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Schweeeeeet!!! time to go scratch in my electric box for parts.........
FokoF
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Things, could you please post the colour coding for those resistors :-[....... my multimeter just died RIP :'(
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Thanks 
FokoF
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tried it....... um works kinda....... :-?
Seems to work better with no 5V going into it and with a 10K pot, but when i get the blanking right its all too dim %#%$^ing DMX!!!!
FB3 FB3 FB3 FB3 FB3 FB3 FB3 FB3 FB3 FB3!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Seems to work better with no 5V going into it and with a 10K pot, but when i get the blanking right its all too dim
%#%$^ing DMX!!!!FB3 FB3 FB3 FB3 FB3 FB3 FB3 FB3 FB3 FB3!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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:-[that could be the problem, might switch over to my Flexmod 1 drive and see what happens :
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4K7 = 4700 Ohms or 4.7K Ohms. So far, it looks to me that the laser TTL inputs have internal pull up resistors and output full power with open TTL input. Maybe a resistor between the driver and laser will allow "1" to be a little higher. I haven't built mine up to the testing point yet.
Mike
Mike
