We repair our HP 106B Quartz oscillator, the most stable quartz oscillator in the HP lineup of 1965, and still one of the best today. It has an adjustment knob graduated in parts in 10^11 (10 parts per trillion), which is unusually small. And ours has some really dubious modifications hidden inside!
HP 115BR Playlist: https://www.youtube.com/playlist?list=PL-_93BVApb5-_7sWRxQ0on8vNy7_H-zxS
Stuff that supports the channel:
- Support us on Patreon: https://www.patreon.com/curiousmarc
- Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links
- Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): https://teespring.com/stores/curiousmarcs-store
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, https://www.pcbway.com
- Electro-Rent: https://www.electrorent.com
- Keysight: test instruments: https://www.keysight.com
- Samtec: connectors: https://www.samtec.com
- R&D Microwaves: https://rdmicrowaves.com
Get more technical info on the companion site: https://www.curiousmarc.com
Contact info: https://www.youtube.com/curiousmarc/about
00:00 The next best thing after the atomic clock
02:53 Grand opening and tour
06:02 It's missing components!
07:19 HP 106B Schematics Explanation
13:32 More dubious hacks on the bottom side
16:47 First power up attempt
19:17 Repairing the supply, more surprises await
24:10 Repairing the LVN indicator
26:22 It works!
28:31 Calibration vs. Cesium atomic clock
31:45 Reuniting the 106B with the HP 115BR Clock
32:19 Modifying for a LiFePO4 battery
37:55 Battery backup demo with clock