Topic: Protect your diode from over voltage on the modulation input

[James]

I'd really like to thank Ferry (satje) for this idea.

It might be simple, but it is the most important addition to the design of the correction amp, since Dean designed it in the first place.

(Well.... my addition of a variable negative voltage regulator didn't suck...  )

Anyway...

Congratulation, my friend! You have made a difference! 

Tens of thousands of laser diodes might live to shine another day! 

Thank you!

James. 

[satje]

We want pictures of a modded DAC

Do you mind if i post this sollution also on PL?
It is about helping peeps...

Cheers!

Ferry

[satje]

BTW did you mannage to test it in a differential setup?


Ferry

[James]

Go ahead and share it all you want. It was your idea.

I'm trying very hard to complete a couple more DACs that I have already promised to send to people. These things take a lot longer to make that I thought!

I think the best place to use the zener is on the modulation input of the laser driver.

I'm putting it on the LaserBoy DAC color outputs because they can easily hit +7.5VDC, when the computer is booting up.

James.