has anyone some easy schematics or tutorials to get a gold plated 3jegged Laserhead to work? I cant give any more info, cause i don't know anything more... i know that one is GND but what are the other two?
The head came fom a laserprinter if that helps you...
and plz no schems with transformers or something... just a simple one...
well i have... but only the board... i have no idea where what signal runs(there was a 80 line cable going in it) so it's hard... and the chps on it... i cant find no datasheets for them (chips are : [line]842 605 {8 pins and smd})
How big is it?, if it's a laser diode they are absolutely critical about the drive current - they only operate just before their destruction point, so the third contact could be an output monitor for feedback (like on a CD player).
Following on from my previous reply, 'LD' sounds rather like 'Laser Diode' and 'MON' sounds like 'Monitor'.
As I mentioned before, applying slightly too much current to the diode will instantly destroy it! - you need to be VERY careful. These devices are also EXTREMELY static sensitive - you should apply strict static precautions at all times.
As you have the board that originally fed the laser, you should follow the wires back and draw out the circuit they used to feed it. There's no point trying to give you a generic circuit, as I've explained previously, if the current is slightly too high you will destroy it instantly - you need the EXACT current for that diode - the easiest way is to copy the original circuit.
The circuit actually feeding the laser shouldn't be too complicated, it's usually an opamp or two in a feedback circuit, and probably a driver transistor or two.
It may be an opamp?, if so the connections are usually standard - so try assuming it's a standard single opamp and see if the connections make sense - if not, assume it's a double opamp and try again.
Can you give us a photo of the chip?
or
Could you rewrite EVERYTHING from the chip's top (all letters and numbers)?
If LD goes to ground through a resistor and there's another pin connected directly to ground, then what's the point of the resistor (assuming that LD is the diode).
I assume that you can't bring the diode to life with the original board, right?