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HP-65 more on the card reader
02-06-2019, 07:00 PM
Post: #57
RE: HP-65 more on the card reader
(02-06-2019 02:57 PM)albertofenini Wrote:  In the scheme I have these looks like Inductor modules, which could be responsible for some noise.
Again, we have some spare parts, but I would find extremely unlikely that on both keyboards these are giving exactly the same fault.
It may be worth to shield the carder reader amplifier to see if in this way it is protected from interference.
What do you think ?

They are there to drive the display LEDs. I guess nothing is impossible as the previous problem showed, but any radiated noise from these shouldn't drown out the WB signal.

cheers

Tony
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Messages In This Thread
RE: HP-65 more on the card reader - teenix - 01-29-2019, 05:25 AM
RE: HP-65 more on the card reader - wallyt - 01-29-2019, 04:05 PM
RE: HP-65 more on the card reader - wallyt - 01-29-2019, 07:08 PM
RE: HP-65 more on the card reader - teenix - 01-31-2019, 12:14 PM
RE: HP-65 more on the card reader - teenix - 01-31-2019, 01:06 PM
RE: HP-65 more on the card reader - teenix - 01-31-2019, 01:54 PM
RE: HP-65 more on the card reader - wallyt - 01-31-2019, 05:09 PM
RE: HP-65 more on the card reader - teenix - 01-31-2019, 07:28 PM
RE: HP-65 more on the card reader - teenix - 02-01-2019, 10:43 AM
RE: HP-65 more on the card reader - teenix - 01-31-2019, 11:54 PM
RE: HP-65 more on the card reader - wallyt - 02-01-2019, 03:38 PM
RE: HP-65 more on the card reader - wallyt - 02-02-2019, 02:50 AM
RE: HP-65 more on the card reader - teenix - 02-02-2019, 04:51 AM
RE: HP-65 more on the card reader - teenix - 02-02-2019, 10:33 AM
RE: HP-65 more on the card reader - wallyt - 02-03-2019, 05:16 PM
RE: HP-65 more on the card reader - teenix - 02-03-2019, 10:51 PM
RE: HP-65 more on the card reader - teenix - 02-04-2019, 12:11 AM
RE: HP-65 more on the card reader - wallyt - 02-04-2019, 04:05 PM
RE: HP-65 more on the card reader - wallyt - 02-04-2019, 05:11 PM
RE: HP-65 more on the card reader - teenix - 02-05-2019, 12:15 AM
RE: HP-65 more on the card reader - teenix - 02-06-2019 07:00 PM
RE: HP-65 more on the card reader - Harald - 02-07-2019, 10:27 AM
RE: HP-65 more on the card reader - Harald - 02-08-2019, 10:03 PM
RE: HP-65 more on the card reader - teenix - 02-08-2019, 11:16 PM
RE: HP-65 more on the card reader - teenix - 02-09-2019, 09:49 PM
RE: HP-65 more on the card reader - teenix - 02-13-2019, 01:47 AM
RE: HP-65 more on the card reader - teenix - 02-13-2019, 10:48 AM
RE: HP-65 more on the card reader - wallyt - 02-13-2019, 04:31 PM
RE: HP-65 more on the card reader - teenix - 02-13-2019, 05:43 PM
RE: HP-65 more on the card reader - wallyt - 02-14-2019, 08:46 PM
RE: HP-65 more on the card reader - teenix - 02-15-2019, 03:53 AM
RE: HP-65 more on the card reader - teenix - 02-15-2019, 09:38 AM
RE: HP-65 more on the card reader - teenix - 02-15-2019, 08:27 PM
RE: HP-65 more on the card reader - teenix - 02-15-2019, 08:42 PM
RE: HP-65 more on the card reader - wallyt - 02-22-2019, 02:23 PM
RE: HP-65 more on the card reader - wallyt - 02-23-2019, 02:32 AM
RE: HP-65 more on the card reader - wallyt - 02-24-2019, 03:17 PM



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