Making low voltage PS for 40W diode

**potatorage** · 07-11-2009, 18:57

How would I be able to do so, I heard you could do so by rewinding a MOT. Does anyone have schematics or any other information?

**mixedgas** · 07-11-2009, 19:05

Originally Posted by potatorage

How would I be able to do so, I heard you could do so by rewinding a MOT. Does anyone have schematics or any other information?

Ever try to knock the HV windings off a MOT? You'll only ever do it once.

Requires a sawzall and lots of bandaids.

You could do it that way, but you still need a precision constant current regulator circuit(big diode driver circuit) downstream or you will blow the diode.

**potatorage** · 07-11-2009, 19:09

Originally Posted by mixedgas

Ever try to knock the HV windings off a MOT? You'll only ever do it once.

Requires a sawzall and lots of bandaids.

You could do it that way, but you still need a precision constant current regulator circuit(big diode driver circuit) downstream or you will blow the diode.

I found someone who'll sell one with the windings knocked off for $20, is that good?

**ionlaser555** · 07-12-2009, 03:41

Ive seen videos of a mot been used to run a 60 watt diode bar not directly , it takes for ever to get the secondrys off

i done it ones my mot gives me 9 volts @ XXX current

good luck getting your diode working

**LaserJay** · 07-12-2009, 05:35

do you know how many Amps is required ? and what Voltage ?

i would use LM317 (the 1.5 amps version T03 case) and run a few of these in parellel (with isolating diodes) to make up the current you need. just a suggestion.

ive used this method in other circuits sucessfully but im not sure its suitable for lasers.

**mixedgas** · 07-12-2009, 05:57

Originally Posted by LaserJay

do you know how many Amps is required ? and what Voltage ?

i would use LM317 (the 1.5 amps version T03 case) and run a few of these in parellel (with isolating diodes) to make up the current you need. just a suggestion.

ive used this method in other circuits sucessfully but im not sure its suitable for lasers.

Its not, you need very, very good current control and overshoot protection.

The OP needs to tell us a bit about his diode. we need Vf. If.

Steve

**mixedgas** · 07-12-2009, 06:42

Originally Posted by potatorage

I found someone who'll sell one with the windings knocked off for $20, is that good?

Well, cosidering it took a hour to do and he got 2$ back from the scrap yard for the copper, yes.

Steve

**potatorage** · 07-12-2009, 08:31

It is this diode http://www.coherent.com/downloads/CC...0_DSrevA_3.pdf -- The 40W version and it says it needs ~2V @ 46A.
This is the FS. thread for it http://www.photonlexicon.com/forums/...coherent+diode

**Laser Ben** · 07-12-2009, 14:53

Probably the simplest way to run it is to find a 2V Vicor DC-DC converter and use the trim function, however, you will need a current clamp to find what current you are running it at.

**potatorage** · 07-12-2009, 18:03

Originally Posted by Laser Ben

Probably the simplest way to run it is to find a 2V Vicor DC-DC converter and use the trim function, however, you will need a current clamp to find what current you are running it at.

How much would that cost?

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