EEVblog #355 - Dictaphone Dumpster Diving - Page 1
Forum section: electronics / general

author: nitro2k01
author_rank: Frequent Contributor
timestamp: September 19, 2012, 11:07:19 am
content: "You know what we say here at the EEVBlog, don't throw it away, take it apart!"

author: T4P
author_rank: Super Contributor
timestamp: September 19, 2012, 11:36:41 am
content: The LCD driver is this one :http://www.mitracon.ru/pdf/SAN/LC7582.pdf"Speaker" driver :http://pdf1.alldatasheet.com/datasheet-pdf/view/163535/PANASONIC/AN6607NS/+0W_5WJVMvMCTRRLHfHU.Gzpaf+/datasheet.pdf

author: free_electron
author_rank: Super Contributor
timestamp: September 19, 2012, 02:17:24 pm
content: Waste-not wednesdayThere, rhyming problem solved.Now, on to other info. This looks like a Matsushita design. The slide potmeters are standard parts from panasonic ( matsushita subsidiary ). The single in line package is common for this kind of device. It is the preamp that hooks up to the tape players head.In the late 80's early 90 i did a lot of repair on car radio's. These sil packages were everywhere. Tape preamp , stereo decoder, equalizers , line inputs for pow amps.That lcd driver is sanyo,There is something special about the pcb as well. Even though this is a double sided board it most likely is NOT plated through. Plating on phenolic resin boards ( this is not a fiberglass board ) doesnt work very well.They squirt an epoxy based compound that is electrically comductive in the holes , let it sit for a few seconds and vacuum pull it back out. The compound is then UV cured. Sometimes this compound is blue and easily recognizable . Here it looks like they used the clear or light green variant.That is why you have the sheen on the board. Besides the soldermask there is an additional coating to protect the vias.These boards are not drilled. They use a punch and die press that punches all holes in one operation. If you look around that single in line package or the regulators you will see that there is no copper on the top layer and no metallisation in the hole.Board is etched, soldermask applied , punched for vias , paste squirted and cured , punched again for thru hole. Sprayed with additional coat to protect vias. You cant solder on these vias . Solder does not stick to them and you would eventually burn them out as well.

author: robbak
author_rank: Contributor
timestamp: September 20, 2012, 02:12:58 am
content: Dave, just a caution: Be more careful with privacy when it comes to junk you retrieve. I know that you would not have put it online if the stuff you heard was important, but a company that does dictation would be pathologically paranoid about confidentiality, and having any of their customer's stuff sent to them appearing on YouTube could send them into a spin!I'd actually recommend reediting your video to remove the dictation audio. You could loose junkroom scavenging rights if they hear of it.

author: Jimmy the Squid
author_rank: Regular Contributor
timestamp: September 20, 2012, 04:34:59 am
content: Quote from: robbak on September 20, 2012, 02:12:58 amif they were pathologically paranoid they should not have thrown it in the junk room like that. But you are probably right that it is better to be safe than sorry. It would be a disaster if Dave lost his Wastebin Wednesday source.

author: Bored@Work
author_rank: Super Contributor
timestamp: September 20, 2012, 05:21:01 am
content: Quote from: Jimmy the Squid on September 20, 2012, 04:34:59 amBut that is typical for companies. They don't do what they preach, but when this if found out a company might decide to work extra hard and the gloves come off to cover up / making good on it.

author: EEVblog
author_rank: Unknown
timestamp: September 20, 2012, 05:26:35 am
content: Quote from: robbak on September 20, 2012, 02:12:58 amIf they want it removed, they can ask me directly (whoever they are). There is nothing in the video that readily identifies anyone, the company, or any sensitive material. You'd have to be paranoid to give a toss. I removed company identifying marks before shooting.I can't lose the right to be in the garbage room, I'm a part owner!And BTW, you can't just magically edit youtube videos after they are uploaded, it doesn't work like that.Dave.

author: Baliszoft
author_rank: Frequent Contributor
timestamp: September 20, 2012, 10:26:19 pm
content: Dave,You have viewers from Hungary :-).Greetings.

author: David_AVD
author_rank: Super Contributor
timestamp: September 21, 2012, 12:11:28 am
content: The retaining wire soldered to the PCB (to hold wiring loom in place) was very common in consumer and semi-professional electronics. Not sure if it's as common now with the widespread use of FFC (ribbon cables) and plug-in assemblies.

author: nitro2k01
author_rank: Frequent Contributor
timestamp: September 21, 2012, 01:10:30 am
content: Quote from: David_AVD on September 21, 2012, 12:11:28 amI don't see the point of holding the wires down so close to the connector. And it also seems like this method would be unreliable because the wires could be shaken loose. I would rather have expected a cable tie around the wires. Wouldn't hold things down, but would keep things tidy.

author: David_AVD
author_rank: Super Contributor
timestamp: September 21, 2012, 08:32:38 am
content: Those insulated wire retainers were used in everything years ago. Quite effective, cheap and reusable after service.

author: johnwa
author_rank: Frequent Contributor
timestamp: September 21, 2012, 11:14:04 am
content: It is always exciting to see what you have found in the rubbish Dave, I think dumpster diving wednesday definitely needs to become a permanent feature!One of my best dumpster finds was about 20 years worth of "Electronics Australia". I wonder what things other readers have found?

author: Majorstrain
author_rank: Contributor
timestamp: September 21, 2012, 12:42:35 pm
content: Great Vid Dave,QuoteI'll suggest"Wheelie Bin Wednesday"- It's a bin and its on wheels.Not a wheelie bin in the true sense, but close enough.Phil