Homebrew Drum Computer

[Allison]

>
>Subject: Re: Homebrew Drum Computer
>   From: ard at p850ug1.demon.co.uk (Tony Duell)
>   Date: Sat, 15 Dec 2007 23:29:12 +0000 (GMT)
>     To: cctalk at classiccmp.org
>
>> 
>> I thought of this, too.  So far I haven't found an online source of  
>> them (Google search terms: "glass delay line" OR "quartz delay line"  
>> OR "ultrasonic delay line" TV PAL OR NTSC).
>
>I didn't think the NTSC system used a delay line at the receiver, but I 
>must admit I've never repaired a US TV set.

Yes they did/do but is was not ultrasonic.  The common ones were basically
the same as LONG (4.5us?) transmission lines.

They would be hard to find.

Allison


>It's not a common component for spares companies to stock, simply because 
>it rarely fails. And of course more modern TVs used IC delay lines, which 
>are not what we want here.
>
>When I wanted one, I went to an (alas long-gone) TV repair shop that also 
>sold compoennts. No, they didn't keep them in stock, but the owner found 
>a scrap PCB with a delay line on it. Needless to say that was acceptable.
>
>-tony