HP-Chopper-Photocell-Driver.kicad_pcb
author: davetheresurrector
2 layer board of 2.62 x 1.18 inches (66.6 x 30.0 mm)
Uploaded:
August 24, 2022
Shared:
November 19, 2023
Total Price:
$15.45
HP 740B Chopper Photocell Driver board version 1.2, supersedes v1.0 . Increased creepage distance, EMI-hardened, and connectors up high to work in A16 position. (Fine for A17 too of course). Probably works in 741B and 419A.
V1.0 description: Rejuvenate tired photochopper modules in vintage Hewlett-Packard test & measurement instruments. Remove demodulator photocells and fit this board on the housing in their place. For parts list, assembly, and programming/calibration, see eevblog thread “Hewlett Packard 740B DC Standard Digital Voltmeter (and 740A)”.
HP 740B Chopper Photocell Driver board version 1.2, supersedes v1.0 . Increased creepage distance, EMI-hardened, and connectors up high to work in A16 position. (Fine for A17 too of course). Probably works in 741B and 419A.
V1.0 description: Rejuvenate tired photochopper modules in vintage Hewlett-Packard test & measurement instruments. Remove demodulator photocells and fit this board on the housing in their place. For parts list, assembly, and programming/calibration, see eevblog thread “Hewlett Packard 740B DC Standard Digital Voltmeter (and 740A)”.
