Laser Scanning Microscope from Blu-ray Player #1: Making a Laser Microphone

[@havelsand]

Great project. I would never had the idea to build a microscope from a blue-ray player optic. Just phenomenal.

[@tcc5750]

The moment I heard your accent I knew this video was going to be good.

[@edgeeffect]

It's such a pity.... so many products contain really powerful SOCs... but because of the lack of documentation, all we can do is throw them away... we could have some lovely free microcontrollers.... if only....

[@ASBO_Rob]

Another awesome project, Keep up the great work, I look forward to the next video.

[@AjinkyaMahajan]

Great project, you can find more helpful information on [Updated! DIY AFM (Atomic Force Microscope)] Instructable. The article was published by Edwin Hwa. I was able to hack into old DVD burners from vintage PC since the documentation is available for them. Cheers

[@DoctorVolt]

Using piezos is an interesting approach. Thanks for sharing.

[@KnobbyHobby4130]

I'm so amazed at your skills in reverse engineering this DVD player. I'm glad I stumbled across your channel when looking for a DIY microscope. New sub now.

[@OfficialPCBGOGO]

wonderful job, can't wait to see your next part

[@carlosbah4623]

Impressive. ¡Gracias por compartir!

[@ESGamingCentral]

Wow amazing. I wish I knew how to make basic circuits

[@joeteejoetee]

@2:27 WOW!!! Thank you very much PCB CAD operators for including this DATA about the connector !!!

[@nilpybilpy4346]

I'm doing this same project. From what I've seen online, the stepper motor isn't precise enough to get fine details, so most people use another VCM for the other axis.

[@DoctorVolt]

Currently I get a resolution of 127x127

[@nilpybilpy4346]

@@DoctorVolt Across the entire scan area?

[@DoctorVolt]

Yes scan area is less than 1x1 mm and pictures look smoothly and not distorted at all, as you will see in part 2 which will be online tomorrow.

[@MaleLion.]

Funny project. You are recreating a measurement system that had been on the market for industrial 3D surface scans more the 25 years ago. Back than optics from a cd-player were used. Accuracy lateral better 1 micron, height better than 0,1 micron.

[@RudysRetroIntel]

Love your great videos!! Looking forward towards your next video! Thanks for sharing

[@bobbykoulouris]

That was a great video

[@yt4krist0f]

Amazing reverse enegeering..!

[@DrewciferTek]

COOL!!!!!!!!!!!!!

[@abdontroche]

Amazing

[@chrisnielsen5467]

Did you use the opamps for any particular reason? Could you just hook those inputs to the MCU pins and handle the logic that way? Or is there amplification happening too? I would like to use this method to simply measure small distances with high accuracy

[@DoctorVolt]

Yes, because there is only very little change of the output voltage. So it makes sense to amplify it to make use of the full AD converter range.

[@qweqwerty7537]

Sir, very good job. Can you ask, how can you find A, B, C and D pins of PDIC pins? On my CD/DVD/Blue-ray PDIC has 15 pins, 12 and 14 pins. Can't search any information. Thank you for your time.

[@DoctorVolt]

Maybe tracing the signals with an oscilloscope while the device is reading a DVD. I was lucky because with my Blu-ray player it was printed on the circuit board.

[@qweqwerty7537]

@@DoctorVolt . thanks for answer. Can you help me - how to identify plus and minus supplying voltage? Itryed your plan, but i dont know, how to connect a power supply(

[@DoctorVolt]

The OPU must be built into the player. Then it should be easy to find out more. If not, I see no way.

[@sciencexpertfrance2272]

hi great project indeed, How did you find the schematics on internet ? it is quite hard for me to find the sf-bd415 which seems similar to yours

[@DoctorVolt]

Simple Google-search and luck.

[@colerittenhouse7]

You have two circuits for this design. On this circuit, you have the positive terminal ( non inverting side ) as b+d and have (a+c) as the negative side on the fes op amp 6:20. On the newer circuit, this is flipped. Was that a mistake?

[@DoctorVolt]

Which is the other circuit?

[@colerittenhouse7]

@@DoctorVolt the second schematic is listed in part 3 of this series and the current hackster webpage

[@DoctorVolt]

@@colerittenhouse7 To me, both circuits look almost identical.

[@colerittenhouse7]

@DoctorVolt on the new schematic, you have the a+c signal going to the positive terminal listed at number 5 and have b+d going to negative terminal listed as 6 on the mcp6004. On the old circuit, the one shown in this video, you have a+c going to terminal 6 the negative terminal and b+d going to terminal 5 the postive terminal. Isn't the formula for op amps VOUT= A(V+ -V-)? Based on this information, on the old circuit you were doing vout=A( (b+d)-(a+c)) and on the new circuit vout=A((a+c)-(b+d))?

[@DoctorVolt]

@@colerittenhouse7 That's correct the only difference is the sign of the FES. No big deal.

[@qweqwerty7537]

sir, thank you again for your project. I bought the same opu head, built the same scheme and have problem, my pdic has no difference in signal, the preamplifying signalalready 5v. Did your Uref is equal to 5v or its my fault?

[@DoctorVolt]

Uref is 2.5 Volt, as the PDIC signals are around that value.

[@qweqwerty7537]

@@DoctorVolt thank you for advice. I connect my oscilloscope to powered opu head and without power on 18 pin on 22 -29 pin on plus and 30 pin to ground. Unfortunately, changing the focus distance with mcp6004 and simply connect has shown no difference. Maybe my PDIC signal doesnt change because i cant reach the focus point? Excuse me, but i have no choice or solution, only waiting your advice.

[@DoctorVolt]

@@qweqwerty7537 the focal point is very close to the lens. Somewhere between 0.5 and 1 mm, and it is only a few micrometers wide. It is best to try it with a piece of aluminum foil, as I showed in part 1.

[@qweqwerty7537]

@@DoctorVolt thank you very much for answering, i'll try.

[@liamdifiore8637]

Is there any reason the PDIC could not have been rotated 90° on the threaded rod and stepper motor configuration so that the platform with the specimen does not have to move

[@DoctorVolt]

The platform has to move in any case, because there is only one voice coil for one direction.

[@idkidk-np8bn]

Hey man is there a way to contact you and ask you questions? maybe discord or something?