Chinese RGB laser 1w : hardware lower output power

10fenny said:

Well it's got ilda in and out plus dmx and SD card. But I garentee that has ttl drivers with what looks like horrible alignment from the pics... look at the "yellow". And I doubt a true 30k... but for the price it'd be a great intro pj... should be..

Click to expand...

Hhaha yeah at that price come on nobody expect Miracle ... actually I Think it's gonna be analog otherwise you fill complain to aliexpress and u get refund for at least a part

But it won't be a linear analog for sure !!!

Like u supposed to get 255 steps with analog u gonna just get probabaly just from 220 to 255 lower gonna be off , probably enought to reduce intensity in some area

Like it's 50mw green anyway it's not a 50w laser but analog réduction is good for testing show at home

Thanks. I spent some time looking through everything they have to offer. Do these ever get held at customs for being laser related? I only ask because they seem to have a disclaimer about that happening.

Still bet it's ttl

Ttl is only on/ off right ?

Rgb Channel in ilda are just 0 or 255 ?

I see what you mean by the alignment. The yellow looks terrible with the red bleeding off the side of the green DPSSL. Probably would have been better to use all direct diodes. Yeah, TTL is only off and on. It really limits the colors you can get out.

Yea ttl give you 7 colors with rgb diodes.. and ilda uses a 0-5 volt for modulation

Yeah, I know. That is not nearly enough for me to be interested. I like the ILDA in out, but like you said, I wonder how well the analog output works on these Chinese projectors.

Its even not the price of a good analog diode :


i think this is this one :
https://www.youtube.com/watch?v=DWNox9cs-C0


or :

https://www.youtube.com/watch?v=DSjGNUvqRhU
same user

https://www.youtube.com/watch?v=enIVadrPFLA

Analog lasers usually are not -that- linear to begn with.

They can be linear from an electrical standpoint, as in the relation between input voltage and output current being perfectly linear (as with good opamp drivers), but that does not mitigate any non-linearlity in the diode.

I suppose it would be best to solve such issues in software. This is perfectly feasible as the intensity in your ilda frames comes as an 8 bit level, while the diode driver will have a dac that is 12 to 16 bits. So you could map this in software much easier than trying to get a linear optical response from the hardware.