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A 12V sealed led gel battery. I guess I've found a possible reason: (Own stupidity) I had the switch after the whole circuit, then the LD. May the idle voltage charge of 12v in the capacitor been enough to kill the diodes?
Registered Member #151
Joined: Sun Feb 12 2006, 02:53PM
Location: Poland
Posts: 153
Yes, this is the reason. It's killing the LD's this way even without the cap. I've killed a few my diodes this way too before i found out what's going on :P The capaciror should be soldered directly to the LD pins. If you want a switch, you should add it between R5 and D2, or even before all circuit on the 12V line.
Registered Member #177
Joined: Wed Feb 15 2006, 02:16PM
Location: Munich, Germany
Posts: 214
Oh, thats too bad. Poor little diode.
@C4r0 Your laser plotter diode uses 250mA of current right? What drive was it from (what was its speed)? I never use more then 150mA cause I'm a chicken and don't want to ruin it.
@Madgyver: Mine was from a 8x speed NEC DVD burner and it could handle 400mA @ 3,7V from a mobile phone accu with a resistor in series of about 8 to 10 Ohms before I tested another power supply. Because I only had my fingers as heatsink I couldn't let it run for longer than about 10 to 15 seconds.
@c4r0: Thx for the hint. Guess I'll get a new DVD burner and'll do better... ;)
Registered Member #151
Joined: Sun Feb 12 2006, 02:53PM
Location: Poland
Posts: 153
Madgyver wrote ... @C4r0 Your laser plotter diode uses 250mA of current right?
250mA is a max current, actually i use rather 200mA.
Madgyver wrote ... What drive was it from (what was its speed)?
If i understand the question properly, it was drove from LPT port with simple transistor buffer (it uses unipolar, four coil, stepper motors). But the speed of plotting is limied by the mechanical part. It moves with max speed about 0.5mm/s.
Madgyver wrote ... I never use more then 150mA cause I'm a chicken and don't want to ruin it.
You just have to ruin one diode to check it :P It's good to get a few same model DVD burners.
Registered Member #177
Joined: Wed Feb 15 2006, 02:16PM
Location: Munich, Germany
Posts: 214
c4r0 wrote ...
Madgyver wrote ... What drive was it from (what was its speed)?
If i understand the question properly, it was drove from LPT port with simple transistor buffer (it uses unipolar, four coil, stepper motors). But the speed of plotting is limied by the mechanical part. It moves with max speed about 0.5mm/s.
Ah sorry, no. I meant the speed from the DVD drive. Was it a 16x Drive or something like that?
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Laser Pen that writes into plastic! [video]
