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Sets, Parts and Service Information Wanted (private buyers only, no swaps) If you need help obtaining components, sets or equipment, post a message here. Private buyers only - no traders. No swaps.

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Old 30th Nov 2020, 11:27 am   #1
factory
Heptode
 
Join Date: Jul 2009
Location: Cheshire, UK.
Posts: 842
Default HP 05247-6008 display board or 5082-5087 decoder

I'm currently working on a rather poorly HP 5248M counter, unfortunately one of the display decoders has been ruined by damp, which has eaten some of the traces from the photo resistor plate.

Does anyone have a replacement display board with part no. 05247-6008, or the decoder photo resistor plate part no. 5082-5087/1990-0018?

Note the standard 5245L uses a different decoder plate which is not useable in the 5248M, but the actual PCB looks identical.

David
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Old 26th Jan 2021, 3:35 pm   #2
factory
Heptode
 
Join Date: Jul 2009
Location: Cheshire, UK.
Posts: 842
Default Re: HP 05247-6008 display board or 5082-5087 decoder

Mods please close this wanted post, as I now have a few spare boards of a different type from Sphere in Canada. I discovered the difference in the decoder plates & divider circuit is due to the BCD code options with these HP counters, most use 1,2,2,4 code and some use 1,2,4,8 code.

David
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