[LAU] [Slightly OT] 312.5Hz

[andy baxter]

Matthew Smith wrote:
> Quoth Folderol at 2008-11-15 21:49...
>   
>> Fascinating bit of kit. I'd be inclined to try to keep it as complete
>> and original as possible. I doubt you'd have a problem with the
>> capacitor. I know someone with a WW2 communications set that still has
>> almost all it's 'dry' caps, and only half the electrolytics have been
>> changed.
>>     
>
> I have to confess, I do feel an urge to restore it.
>
> I will certainly do preliminary tests (once I've got the thing spinning) 
> with and LED and a phototransistor, just to see what it sounds like, but 
> getting a proper setup with the lamp and selenium cell seems like the 
> Right Thing To Do.
>   
You can get a combined infrared led/phototransistor in a 'reflective 
switch', which could be neater if you do it that way. I'm using the 
opb606 for another project, which costs under 1 UKP.

andy