Just found this video in 2024 but still glad you have it up. I've always been interested in old video/audio technology (especially analogue television) so to see how old 35mm surround sound audio finally works is a wonder. Cheers for the video and keep up the good work.
@Vcd832
11 жыл бұрын
when i was a kid, my father took me in to the projection room of a movie theater where my uncle was working as projector operator. That was the first time i saw Dolby CP 500 and bunch of Pulz amplifiers and DTS processor. I was so eager to see how CP500 works, whats there inside, and hell lot of questions...That was around 18 yrs ago from now. after watching this video, all my memories got refreshed... thanks
@paulhoward4161
11 жыл бұрын
That's an awesome find. This is what makes teardowns so popular, the chance to see inside stuff we don't come across that often.
@momo4733
8 жыл бұрын
The board with the 7 segment LED checks the error rate of the video signal (dropped frames due to the frames being damaged). If the error rate climbs too high, the processor automatically reverts to analog soundhead.
@augustinewillie136
3 жыл бұрын
not sure if anyone gives a damn but if you guys are bored like me atm then you can watch all of the latest movies and series on instaflixxer. Have been watching with my brother lately =)
@9milNL
11 жыл бұрын
I have no clue about electornics, but I find it enjoyable and relaxing very much watching your videos.
@sguttag
2 жыл бұрын
This was quite impressive. It is clear that he was not a user of the product yet immediately grasped what each module and what the parts on each module were doing and pretty much nailed it. And yes, unbalanced output. Cinema was the last bastion of unbalanced professional audio. Furthermore we have used 300mV as our reference level (-8.2dBu). From Dolby, the next processor, the CP650 did move to balanced output (still 300mV reference level) and also used DB25 connectors instead of the Phoenix style of the CP500. With DB25s, one could maintain shielding of the audio though the connector and it pretty well shielded up the whole backplane. No, XLR connectors never found widespread adoption on any brand of Cinema Processor, with Sony being the notable exception. XLRs in cinema bring nothing to the table except an added expense for the connector and the time to make them. Prior to the CP500, the customary I/O connector was a terminal block that used a fanning strip for solder connections. With cinemas, that wire is often only touched upon installation and to never be touched again until removal...decades later. There is no need for any connector that promotes ease of removal. It is more important that the connection be good over a long span of time.
@momo4733
8 жыл бұрын
The camera on the digital soundhead is a linescan camera. I can send you the actual digital soundhead to go with it if you are interested.
@SproutyPottedPlant
11 жыл бұрын
Many great movies were watched and good times had all thanks to the help of a little grey Dolby box!
@AwwC00L
11 жыл бұрын
I have learned so much on this channel. Keep it up
@moonpieface7627
11 жыл бұрын
I love your videos. I have no idea what you're doing most of the time, and I wish I did, but I love your videos.
@DasBootII
11 жыл бұрын
Really enjoy your fine work sir!
@EEVblog
11 жыл бұрын
What did you use for your microscope views?
@jekader
9 жыл бұрын
90s electronics are cool! So many elements, now it's more integrated and less interesting to look at the PCBs
@Chr0nalis
9 жыл бұрын
It's more integrated , but it can do more stuff :)
@itsGeorgeAgain
9 жыл бұрын
jekader it's more like the cleverness has migrated to the software side from the hardware logic side.
@jeffbenz0s
9 жыл бұрын
***** Not necessarily. Software won't be able to do the cleverness without the complexity of integrated circuits, etc.
@itsGeorgeAgain
9 жыл бұрын
Dr. Cooldude what i mean is, right now the chip is a cpu, with a dsp an mmu and an FPU under one roof, and you write the program. Before that discreet logic was to do all that with different chips doing different stuff and wiring them. You didn't write a command like add this to that then multiply it with a language. You had to take adding ICs and implementing it like that. I'm not saying that it's bad or wrong or that it is any less "smart" in doing it in software.
@jeffbenz0s
9 жыл бұрын
***** Ah, fair enough, I see what you mean now.
@daddarioolu
11 жыл бұрын
hah, I kept thinking of the exact same scene from Spinal Tap, whenever You said "Dolby". Great video, I find 80's-early 90's professional audio and video apparatus and their construction absolutely fascinating and a real beauty to see. Combination of tht and smd technology, boards packed with dil8/14 opamps and insane amounts of expensive connectors and switches for non-mil gear.
@WAYNE1980AA
11 жыл бұрын
because i remember you had more videos and they were fun to watch,
@stupossibleify
11 жыл бұрын
In shock that you had me gripped for nearly 30 minutes talking about such an esoteric bit of kit. I now know slightly more than nothing about electronics. More please.
@ChipGuy
11 жыл бұрын
Very nice teardown, especially using a hammer to open the ADC. Always unusual and interesting stuff.
@laharl2k
11 жыл бұрын
a fpga and a few common components. if you see the inside of an oscilloscope it is mostly some fpgas and the big special adcs along with the ram chips for the memory.
@nexgenhippy
8 жыл бұрын
dying to get hold of one of these. im stuck using an old CP45 at the mo but these have lovely custom definable user formats.
@gslug1
11 жыл бұрын
They also produced PC sound cards and the audio hardware in some early Macs.
@DjResR
11 жыл бұрын
Very interesting 26 minutes. Great teardown, mate, keep up the good work._
@mikeselectricstuff
11 жыл бұрын
Through-hole parts can be machine inserted. Can't really tell by looking at the PCB though. Obviously they will be flow-soldered.
@douro20
11 жыл бұрын
The AD1879 was developed jointly by Analog Devices and Ensoniq; it's original application was the ASR-10 sampling synthesizer. Both dies in the package are manufactured by Analog Devices, as Ensoniq never did have its own facilities for fabricating chips.
@CanyonProducoes
11 жыл бұрын
I live in a small city in Brazil and we still have a 35mm projector, but we don't use the dolby digital sound, we still use the optical stereo analog track, very old school :) In my channel you'll find a couple of videos of us assembling the films
@Imdor
11 жыл бұрын
Lol the Spinal Tap clip just made this teardown epic:D
@gavincurtis
11 жыл бұрын
Call me old fashioned, but the old school plated through hole seems to be much more robust than surface mount. I see so many surface mount components lifting off and trying to escape.
@douro20
11 жыл бұрын
Yep, lots of 5532 op-amps. There are six of them in my late-80s Magnavox CD player. Those Dolby custom chips were probably made by New Japan Radio (JRC).
@redtails
10 жыл бұрын
Sweet stuff
@mikeselectricstuff
11 жыл бұрын
It's a conventional lab type microscope, but illuminates through the objective - I think these are commonly used for metallurgy. Plus an SLR eyepiece adaptor - the latter doesn't work as well as it should do though - images are much clearer via eyepiece - not had time to investigate why.
@douro20
11 жыл бұрын
Most of them are for level buffering. I know it doesn't make sense that there are two of them on the DAC outputs when each NE5532 has two op-amps in them. Four of the 5532s are in the audio stages and the last two are in the circuitry for the CD mechanism itself.
@RetroGamerVX
11 жыл бұрын
Great find Mike. The interior of that reminds me so much of the Quantel Paintbox (on my channel) that we've been trying to fix for nearly a year now lol ;o)
@DoctorDARKSIDE
11 жыл бұрын
Fantastic video Mike! Now that is entertainment... What about some reviews/teardowns of retro-computer stuff? It would be interesting to have a look at some old motherboards when they didn't use so much digital stuff and processors.
@originalmianos
11 жыл бұрын
Amazing. I wonder how much modern hardware would be needed to replace the whole box?
@TheStevenWhiting
11 жыл бұрын
After watching this I had to look up that end video at first I thought one of the guys was an old vid of Mike from the 80s. Then I found out it was Spinal Tap. The most shocking part, I never knew Spinal Tap weren't a real band :) after all these years. I'd heard of them but never listened to them, that's my excuse for not knowing they were actually a parody band.
@joyange1
11 жыл бұрын
To answer you question @19:19. The camera is a linear CCD like the one you find in a flat bed scanner. Not a Dot-Matrix.
@johnfranks
11 жыл бұрын
Hey! I have the matching sound processor to that! (DA20) Found it at the scrap yard for like $3. =)
@rarbiart
11 жыл бұрын
the BOM for this baby must have been a fortune! (And the r&d costs related to the relativly small production batches comes on top of that)
@rodneyb2640
11 жыл бұрын
@7:10 Reconfigurable via components into a header, clever.
@RetroGamerVX
11 жыл бұрын
I have the dpb 7001 out of the BBC's Ellstree studios :o) It's got 2 tablets of different ages and makes (no magnetiser), the Fujitsu 335mb hard drive with 11 inch? platters, an 8 inch floppy drive with loads of floppies (hoping to read them with the pc in teh next few weeks), loads of service manuals, operator manuals etc. Had to build a new power supply as both originals blew up!. ATM, it's booting to debug but can't find it's drive, a friend is building an interface to see what the back...
@douro20
11 жыл бұрын
What is the part number on those gold-capped Analog Devices MCMs?
@video2k007
11 жыл бұрын
Hi Mike, is there a difference between (the quality of) SMD and through-hole resistors? If one has the possibility to place SMD parts, wouldn't it be faster and cheaper to use as much SMD parts as possible? (btw, very nice video - as always!)
@flemmingmller2274
11 жыл бұрын
Hej Nice video. I have a problem with my CP500, it is about 5 min to start up and after that it works perfect.All lights on front light up in the 5 min to lamps light faulth på the to board cat.no. 675A.Do you have an idea what it cult be.
@srfurley
10 жыл бұрын
I never really liked the 500; preferred the previous model, the CP-65. The DA-20 was to add the facility to play Dolby Digital tracks to the older processors. I'm adding a secondhand DA-20 to a cinema with a CP-65 at the moment. It's re-opening next month, and will still run film for special events.
@whitcwa
11 жыл бұрын
DPB7000? The original paintbox? I spent a lot of time fixing those. It helped that we had three of them. I still have the 4 foot long magnet for remagnetizing the tablet. It's great for sweeping up metal bits.
@blaaaaaaarghable
11 жыл бұрын
I'm surprised to see an Ensoniq part - they were very well known for high-end synthesizers and and audio gear.
@Designsbyg
6 ай бұрын
i have one of these. i'm using it with a film projector
@electronash
11 жыл бұрын
I used to drool over these back in the day. Always wanted to find one on eBay to see how much the audio differed from DVD's. It would need the optical reader to be spoofed somehow ofc, but would be very interesting to play with. Mike - I don't suppose you will be selling any of those boards at all? I hoping it hasn't already been scrapped? :(
@Hedphelym
11 жыл бұрын
What would the labour costs be for these boards? So many through hole resistors etc, must take a long time to set them all.
@zashbot
11 жыл бұрын
those led boards are probably volume indicators
@Punky-Boy
11 жыл бұрын
where you buy this ??
@RetroGamerVX
11 жыл бұрын
...plane is doing :o) This one was apparently used in the production of Dr Who etc and I have 8 inch floppies from Eastenders sitting here and the BBC Globe :o) The videos are on my channel, some 4 hours long as we've done live shows too. Any advice you could give would be appreciated :o)
@icesoft1
11 жыл бұрын
Per tesla500's projector teardown part 7: watch?v=SqZhLzvvUp0 which seemed to be of a similar vintage, the Dolby Digital camera is a linescan type camera rather than full-frame.
@ligius3
11 жыл бұрын
It took me quite some time to figure out the Dobly logo at 26:11
@mark314158
11 жыл бұрын
Excellent teardown. Very strange that all this Dobly stuff was made in the UK. Anyway wasn't Dolby in Harry Potter?
@abvmoose87
4 жыл бұрын
While I really appreciate you taking the time and sharing this, its a little difficult to make out what your saying. You talk really fast and mumble a bit. Can one use this in a home cinema? Can it accept sound signals from a dolby digital track on a dvd snd decode it properly. Im asking since i think the mastering for the cinema version of the movie is different from the one they make for home video version. I understand that you have to calibrate for the room and such but can it even accept a standard 5.1 surround track from a dvd or is this only for use with films?
@douro20
11 жыл бұрын
tesla500 would be able to tell you what kind of camera they are using on the Dolby Digital optics; he has a projector with those types of cameras in them.
@Tadesan
2 жыл бұрын
I miss Burr-Brown!
@reyjulio
7 жыл бұрын
why is so complicated,a receiver is only a small chip decoder and make the same function.what is the difference?
@mikeselectricstuff
11 жыл бұрын
Ebay, obviously
@markatherton7848
10 жыл бұрын
Did you get my email about development of this product ? Regards, Mark
@DanFrederiksen
11 жыл бұрын
Often when I see a circuit I think that could be done a lot simpler. This is an extreme example. Rational audio is obviously kept entirely digital and only made analog in each speaker element using class D or similar clean efficient design. Those analog landfills offend me at my core :)
@Tadesan
2 жыл бұрын
Would you not consider that to be technically superior but qualitatively not so? In my experience the subjective difference in audio topologies is best analyzed by ‘functions’. For example- it’s very hard to measure the differences in MP3 compression. The data defined by that compression is intentionally designed to measure the same as the original and the engineers do a good job! (They also wanted it to still sound like the original too. So there’s that.) Point being, BY DEFINITION data is lost; therefor the sound quality has been degraded. Can you hear it? I was dismayed to discover that you can. It’s a loss of ‘air’. There is no measure for that as far as I know… But the qualitative difference is supported by evidence that data was lost. To your point- a dominant pole output inductor on a class d amp ahead of the variable inductance of the voice coil itself should provide a better impedance to the digital section. Right? Now, inductors by nature have a memory. What came before affects what is happening now. Wouldn’t a linear circuit be preferable? Digital equipment is also commonly time dependent. Which system has a faster settling time to the original signal? Well, that’s why I love audio. :)
@Orcinus24x5
11 жыл бұрын
YAY Spinal Tap! \o/
@scottyleics
11 жыл бұрын
Damn those fans are loud!
@hpux735
11 жыл бұрын
Why am I not at all surprised that you're a spinal tap fan? :)
@WAYNE1980AA
11 жыл бұрын
what happened to all your videos?
@FrontSideBus
11 жыл бұрын
I dread to think how much this must have cost new!
@Lion_McLionhead
11 жыл бұрын
Now tear down the projector.
@TheTowz
11 жыл бұрын
lots of analog stuff in there so it's to be expected
@Samsgarden
11 жыл бұрын
Wonder why it's obvious?
@pyros80
11 жыл бұрын
Thats alot of analogu-ness. !
@warrmr
8 жыл бұрын
Ugh the audio output isn't even a balanced line out :(
@cliveramsbotty6077
8 жыл бұрын
I think they also made an option card you could spec with a DB25 tascam pinout
@onwul
11 жыл бұрын
I like how you were talking about a fancy way to get that cap off the chip, but at the end used hammer and a screwdriver.
@Samsgarden
11 жыл бұрын
OK. It's a bit presumptuous though.
@startazz
11 жыл бұрын
Because thats where he gets most of his cheap gear and most of his subs would know that i guess,just saying. :-)
@Ub3rGam3rz
11 жыл бұрын
Hard to imagine that all this is now simply put on a small chip on my motherboard.
@cypeapplejuice
11 жыл бұрын
Why don't you just make 10 louder?
@Bisqwit
9 жыл бұрын
Your video topics are really interesting, but _man_ is your voice monotonous. As a foreign person it is really hard to grab on to the narration, when it's spoken as if the entire video is one long uninterrupted sentence.
@DrTune
8 жыл бұрын
+Bisqwit You must be after Dave's EEVBlog ; if you can handle his over-excitable squealing style. Personally I prefer Mike, much calmer.
@Bisqwit
8 жыл бұрын
+Dr Tune I actually prefer bigclive. I can only tolerate Dave so much.
@DrTune
8 жыл бұрын
I like all three of them, they have their individual styles :-)
@gamccoy
11 жыл бұрын
While audio quality was the design goal, I have to guess so many discrete components and signal paths must have actually introduced a fair amount of noise and distortion :(
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