help with dummy load and setting ddl current

i made a basic ddl circuit i found on this forum, and made a diode series that was measured at 4.5v drop. my problem is it was a mishmosh of like 9 diodes and the 1 ohm resistor to make that measured drop, is that my problem, even though it measured out at 4.5v drop?

could my problem be that i left the 1 ohm resistor in series with the laser diode?

oh also when i measured everything with the dummy load it read 6.97v @ 80mA which seems too high, could it be the battery (i used a 9 volt)?

but anyway i discharged the cap, soldered the diode in, popped the batt back in and the violet diode was bright as hell.....for 3 seconds... then it got really dim and died, the axiz module was really hot too and that was the end of my first blue violet diode

First.... you need only 6 Rectifier Diodes for a Blu-Ray Test load...

With 9 diodes you will not get the correct load to adjust the
Driver properly...
That is why at the current you stated you had such a high voltage
on the output of the Driver...
The current/voltage was adjusted to high... Which blew your LD...


Jerry

even though when measured with my dmm the voltage drop was 4.5 volts combined?

ALL silicon diodes drop .7V per diode. .7x9 = 6.3v drop. .7x6 = 4.2v. Don't just trust your meter, do the math.