OngoingHP 410C amp
STDHP 410C amp
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Reproduction cost: $50
License
：TAPR Open Hardware License
Creation time:2025-02-08 23:48:36Update time:2025-08-13 01:19:57
Description
Update PCB's for HP 410C voltmeter. replaces original hybrid Vacuum tube design with modern Opamps.
Using a modern CMOS opamp vastly simplifys the circuitry. Also working on a modern replacement for the AC probe. The original uses an irreplaceable vacuum diode.
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