HP-21 - Crazy numbers
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04-30-2019, 12:56 AM
Post: #4
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RE: HP-21 - Crazy numbers
As discovered, corrosion and copper sulphate will change internal electrical specs. Vinegar is a great remover of sulphites followed by a good rinse. Of corse after you have removed 5h3 led block and keyboard.
I have soaked a 25 PCA in a glass of vinegar over night without detriment to the circuits. Also, Electrolytics caps can reform when in use. Others like the button and ceramics a very stable and do not leak or short as the Electrolytics can. Good job, Nice to no another ACT Woodstock has survived. |
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Messages In This Thread |
HP-21 - Crazy numbers - BusyCalc - 04-25-2019, 07:20 AM
RE: HP-21 - Crazy numbers - Maximilian Hohmann - 04-25-2019, 12:32 PM
RE: HP-21 - Crazy numbers - BusyCalc - 04-29-2019, 06:16 AM
RE: HP-21 - Crazy numbers - albertofenini - 05-02-2019, 02:05 PM
RE: HP-21 - Crazy numbers - Geoff Quickfall - 04-30-2019 12:56 AM
RE: HP-21 - Crazy numbers - BusyCalc - 05-02-2019, 08:56 AM
RE: HP-21 - Crazy numbers - Maximilian Hohmann - 05-02-2019, 10:21 AM
RE: HP-21 - Crazy numbers - BusyCalc - 05-02-2019, 01:49 PM
RE: HP-21 - Crazy numbers - BusyCalc - 05-02-2019, 05:04 PM
RE: HP-21 - Crazy numbers - albertofenini - 05-02-2019, 05:09 PM
RE: HP-21 - Crazy numbers - BusyCalc - 05-04-2019, 09:38 PM
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