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Hilfe !! Mein Deutsch ist sehr slecht aber ich werde es versuchen.
Also, ich habe vor 3 monaten bei Rumzing mir ein 1 Watt dpss laser gekauft. Hat leider lange herumgelegen da ich keine Zeit hatte.
Jetzt isst mir aufgefallen das wenn ich 5 volt anlege am blanking-eingang ich so um die 640mw raus bekomme. Ziehe ich denn blanking stecker, dan schiesst er rauf of 1050mw.
Das kann doch nicht normal sein oder ?

Zweifele ob ich jetzt ein pcaom soll einsetzen.

Gruss,
Marco

Hi Marco,

ik heb ook een rumzing welliswaar een lichtere maar ondervind geen problemen.

Ondervind je bij andere lasers hetzelfde?

Hello,

sounds like a Modulation-Input with internal Pull-Up Resistor.
Disconnect the Modulation Plug and measure the Voltage from the Input.
I think it is more than 5V . Is it a single-ended Input ??

Greetings

Guido, what do you mean with input voltage ?
I took a lm7805 to get a stable 5 volt to feed the blanking-input with.
Rumzing told me that it is normal that their lasers give only half of the power when blanking is used.
See their reply of my email to them:

Marco,

But, all our lasers is half power when it is being modulated, all our lasers is so, so, even if we repair it, the modulation power is still about half of original power.
even our 200mw is so, when it is being modulated, power is about 100mw.

Best regards,

Hong

Guido, do you know those powersupplies from Rumzing ? In other words, could you repair or modify it to meet the specifications ?

Greetings,
Marco

Hi Marco,

sorry, i dont know them.

Hmmz...to say in German...Schade

Ok, so if i understand you correctly, the blanking-input has a pull-up resistor to switch it on when the blanking connector is not connected.
You talked about input voltage, what do you mean exactly ?
The input connector has 4 pins, only three are used.
Blanking +, blanking gnd and a pin that is connected also to ground.
So if i connect the connector to the powersupply two pins are shortened and the laser goes out. If i connect then + 5 volt to the wire i only get around 640 mwatt of output power.

I'm a little afraid to take 6 volt instead of 5 volt.

Greetings,
Marco

I try help you.
I don't know supply from Rumzing but I think that it is also simple- What it can have...? current limiter at Operational Amplifier?

I think that first you must check Voltage at input leg in amplifier (from Vref, not diode current) when DPSS work with full power.
Next, check this voltage when DPSS work with blanking. When it have half from "normaly" voltage then maybe you need only to change gain in previous stage... You can drawing the scheme here?

It is sick, half power...

Maybe ask Hong why thier DPSS must work with half power.? I thing buy something from rumzing, but now... no way