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Unusual HP-21 ?
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11-25-2017, 10:16 PM
Post: #2
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RE: Unusual HP-21 ?
Indeed Vss exhibits a >10% ripple at about 70 kHz.
I have tested the power module after removing it from the main PCB. With a load of about 30 mA on Vss the ripple is still present. May this quite high ripple prevent the operation of the ACT? Or is it the ACT that needs to be replaced? |
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| Messages In This Thread |
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Unusual HP-21 ? - jch - 11-11-2017, 09:08 PM
RE: Unusual HP-21 ? - jch - 11-25-2017 10:16 PM
RE: Unusual HP-21 ? - jebem - 11-25-2017, 11:00 PM
RE: Unusual HP-21 ? - jch - 11-26-2017, 08:12 PM
RE: Unusual HP-21 ? - jebem - 11-27-2017, 10:34 AM
RE: Unusual HP-21 ? - PANAMATIK - 11-26-2017, 07:44 AM
RE: Unusual HP-21 ? - jch - 11-26-2017, 08:51 PM
RE: Unusual HP-21 ? - jch - 03-06-2018, 12:31 PM
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