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Forums
4hv.org :: Forums :: General Science and Electronics
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unusual component

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Avalanche
Fri Nov 10 2006, 09:15AM Print
Avalanche Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
 		I recently took apart an old VCR to get the useful parts out. Whilst I had it in bits, I spotted this strange blue component on the pcb. It looked like it was a cover for something else, so I grabbed it and tried to pull it off. Suddenly glass shot everywhere and I was staring at this unsual frosted glass sheet with dark squares on it rolleyes

Has anyone got any idea what this is? I haven't even got a clue, and I've not had any luck with google. Pic shows the cover on the left, and the remains of the (glass?) sheet attached to its wires.


1163150063 103 FT0 Component
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Sulaiman
Fri Nov 10 2006, 10:30AM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
 		It's a delay-line.
A piezo strip on one edge converts electrical signals to vibration (sound) that bounces all around the glass (you can easily trace the path - except when you've broken it cheesey )
The dark 'blobs' are obstacles to keep the 'beam' neat.
A second piezo strip picks up the delayed signal.
From memory
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Avalanche
Fri Nov 10 2006, 11:59AM
Avalanche Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
 		I never would have guessed that, thanks

I assume it's a very precise thing, so a simple RC or logic delay wouldn't be good enough... seems like an unusual component choice.
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WaveRider
Fri Nov 10 2006, 12:01PM
WaveRider Registered Member #29 Joined: Fri Feb 03 2006, 09:00AM
Location: Hasselt, Belgium
Posts: 500
 		It could be a humidity sensor. Precision delay lines would almost certainly be packaged in a ceramic or metal container...

Humidity sensors are common in VCRs to prevent turn-on if condensation is present..
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Marko
Fri Nov 10 2006, 12:48PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
 		It's definitely a delay line common in various, older electronic stuff.

Sme of them I have are inscribed 'delay line' on their package, and packages are exactly as same as this one.

Obivously there's no need to hermetically seal them, although there are lots of integrated and sealed versions today...
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Alex
Fri Nov 10 2006, 03:25PM
Alex Geometrically Frustrated
Registered Member #6 Joined: Thu Feb 02 2006, 04:18AM
Location: Bowdoin, Maine
Posts: 373
 		The silkscreened component number "DL3001" seems to agree with the hypothesis that it's a delay line.
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Self Defenestrate
Fri Nov 10 2006, 03:47PM
Self Defenestrate Registered Member #87 Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191
 		Boy, I remember i was looking at one of those in an old dead camcorder a few years back, puzzled me to no end! Anyone have any clue what the "dark blobs" are made of?
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Steve Conner
Fri Nov 10 2006, 05:09PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		It surely is a delay line. The PAL TV system used in Britain needs to compare the current scan line with the previous one as part of the demodulation process, so that delay line is needed to "remember" the previous line.

This clever system cancels out errors and gives better colour stability than the American NTSC system, which video guys jeeringly call "Never Twice the Same Colour" wink Of course, I guess it's done digitally nowadays.
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Simon
Sat Nov 11 2006, 03:29AM
Simon Registered Member #32 Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549
 		Yes, I've got a junked VCR board in my collection with a box about that size clearly marked "DELAY LINE".
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Download
Wed Mar 07 2007, 08:31AM
Download Registered Member #561 Joined: Sat Mar 03 2007, 02:46AM
Location: Adelaide Australia
Posts: 230
 		if you open up a quartz ossilator you ind something simmiler
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