CuriousMarc
UNITED STATES OF AMERICA • + Follow
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Description
HP 09825-66552 Crowbar Protecton Circuit for the HP 9825 Vintage Calculator
A reproduction of the original HP add-on modification provided for protecting the HP 9825 and HP 9835 power supplies from destructive over-voltage.
BOM as per the schematics:
R1 100 Ohms 1% 1/4 Watt
C1 0.01 uF
Z1 1N5243B
Z2 1N5232B
SCR1 2N4441 (vintage thyristor used in the HP original) or BT258-500R (modern equivalent)
More info in the HP 9825 repair series on my channel:
https://www.youtube.com/playlist?list=PL-_93BVApb58Hy846J52DT8FeF9USYJUn
Schematic and Layout
CAD-Custom parts and enclosures
Jan 12,2022
1,888 views
HP 09825-66552 Crowbar Protecton Circuit for the HP 9825 Vintage Calculator
A reproduction of the HP 09825-66552 add-on crowbar protection circuit, to prevent your HP 9825 vintage calculator to go up in smoke.
1888
3
4
9.50 (1)
Published: Jan 12,2022
Download Gerber file 27
BOM(Bill of materials)
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File Last Updated: 2024/01/05 (GMT+8)
File update record
2024-01-0514:13:17
Parts List (BOM) is updated.
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- Gerald Sweers May 28,2023
- Engineer Dec 22,2022
- Frits Jalvingh May 15,2022
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More by CuriousMarc
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