Matsushita Delay Line EFD-EN645

axl · Joined: Oct 28, 2012 Posts: 33 Location: ita

Hello !
today i found in a old tv this Ic's.
Can't find anything online No datasheet no projects etc.....
Someone know how does it works?
Is it suitable for audio pourpose??

Thanks
Alex

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DrJustice · Posted: Tue Nov 06, 2012 11:21 am Post subject:

The most concise info I could find was: "DELAY LINE 64uS EFD-EN645 - Quartz, Ker.filter, stb.".

64uS happens to be the scan line interval in PAL and NTSC televisions.

In conclusion, unless you specifically need a 64uS analogue delay, I can't see much use for it in audio projects.

DJ
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axl · Joined: Oct 28, 2012 Posts: 33 Location: ita

kind of optocouple right?????
Thanks Dr.justice

DrJustice · Posted: Wed Nov 07, 2012 12:44 pm Post subject:

From the little info I found ("Quartz, Ker.filter, stb") it's probably based on a quartz crystal, like the image below (from this wiki article).
Hey - it even looks the same w.r.t. packaging and pinout and has the same specs Smile

Posted Image, might have been reduced in size. Click Image to view fullscreen.

DJ
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axl · Joined: Oct 28, 2012 Posts: 33 Location: ita

Uhm.......... will be nice to see the freq response of this stuff.....
the piezo usually have strange cool sounds.....

cloudscapes · Joined: Feb 09, 2004 Posts: 100 Location: Montreal

This is not an audio delay line in that it doesn't involve memory. You can't delay audio, just electric signals a few millionth's of a second.