Author Topic: EEVblog #355 - Dictaphone Dumpster Diving  (Read 18350 times)

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Offline nitro2k01

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EEVblog #355 - Dictaphone Dumpster Diving
« on: September 19, 2012, 11:07:19 am »


"You know what we say here at the EEVBlog, don't throw it away, take it apart!"
Whoa! How the hell did Dave know that Bob is my uncle? Amazing!
 

Offline T4P

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« Last Edit: September 19, 2012, 11:45:31 am by T4P »
 

Offline free_electron

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Re: EEVblog #355 - Dictaphone Dumpster Diving
« Reply #2 on: September 19, 2012, 02:17:24 pm »
Waste-not wednesday

There, 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.
« Last Edit: September 19, 2012, 02:48:00 pm by free_electron »
Professional Electron Wrangler.
Any comments, or points of view expressed, are my own and not endorsed , induced or compensated by my employer(s).
 

Offline robbak

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Re: EEVblog #355 - Dictaphone Dumpster Diving
« Reply #3 on: September 20, 2012, 02:12:58 am »
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.
 

Offline Jimmy the Squid

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Re: Re: EEVblog #355 - Dictaphone Dumpster Diving
« Reply #4 on: September 20, 2012, 04:34:59 am »
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.

if 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.
 

Offline Bored@Work

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Re: Re: EEVblog #355 - Dictaphone Dumpster Diving
« Reply #5 on: September 20, 2012, 05:21:01 am »
if they were pathologically paranoid they should not have thrown it in the junk room like that.

But 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.
I delete PMs unread. If you have something to say, say it in public.
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Offline EEVblog

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Re: EEVblog #355 - Dictaphone Dumpster Diving
« Reply #6 on: September 20, 2012, 05:26:35 am »
I'd actually recommend reediting your video to remove the dictation audio. You could loose junkroom scavenging rights if they hear of it.

If 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.
« Last Edit: September 20, 2012, 05:30:13 am by EEVblog »
 

Offline Baliszoft

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Re: EEVblog #355 - Dictaphone Dumpster Diving
« Reply #7 on: September 20, 2012, 10:26:19 pm »
Dave,
You have viewers from Hungary :-).
Greetings.
 

Offline David_AVD

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Re: EEVblog #355 - Dictaphone Dumpster Diving
« Reply #8 on: September 21, 2012, 12:11:28 am »
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.
 

Offline nitro2k01

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Re: EEVblog #355 - Dictaphone Dumpster Diving
« Reply #9 on: September 21, 2012, 01:10:30 am »
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.
I 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.
Whoa! How the hell did Dave know that Bob is my uncle? Amazing!
 

Offline David_AVD

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Re: EEVblog #355 - Dictaphone Dumpster Diving
« Reply #10 on: September 21, 2012, 08:32:38 am »
Those insulated wire retainers were used in everything years ago.  Quite effective, cheap and reusable after service.   :)
 

Offline johnwa

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Re: EEVblog #355 - Dictaphone Dumpster Diving
« Reply #11 on: September 21, 2012, 11:14:04 am »
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?
 

Offline Majorstrain

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Re: EEVblog #355 - Dictaphone Dumpster Diving
« Reply #12 on: September 21, 2012, 12:42:35 pm »
Great Vid Dave,
Quote
Waste-not wednesday
I'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
 


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