Products > Test Equipment
40,000 Count Multimeter under $50 - HoldPeak HP-770D
coromonadalix:
mmmmm the HY3131 is a 50 k count chip, maybe there could be some hack ?? eepom edit someting ???
GigaJoe:
--- Quote from: LooseJunkHater on September 12, 2023, 02:33:54 pm ---Never heard of overclocking a meter before.
--- End quote ---
basic idea to change quartz , of course all related measuring changing as well, additionally stability on lower power voltage , can hiccup. some aneng works on 3x ( 12M) quartz . never play on expensive meters , due to mostly , complexity of cirquit, and no reason, if you already have cheap overclocked one.
basic modding to add polymer caps with battery usually very noisy power line generated by chip itself, caps to vref , soldered connectors, something else like GDT
iMo:
--- Quote from: LooseJunkHater on September 12, 2023, 02:28:23 pm ---
--- Quote from: iMo on September 12, 2023, 09:36:58 am ---A pity they use the 9V block battery when the Vreg is 3.3V one inside, it takes 5.6mA (backlit leds off) what is not particularly low for a, say, 9V 250mAh NiMH battery, imho..
At least a step-down switcher would be handy there with the 9V battery.
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I actually think it's kinda nice that it uses a 9v battery with a 3.3v regulator. It allows the meter to be easily modded to use rechargeable lithium batteries in a 2s configuration. It'll have a longer battery life compared to the 9v cell and be rechargeable.
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Something like this..
iMo:
--- Quote from: coromonadalix on September 13, 2023, 01:53:19 am ---mmmmm the HY3131 is a 50 k count chip, maybe there could be some hack ?? eepom edit someting ???
--- End quote ---
LooseJunkHater:
--- Quote from: GigaJoe on September 13, 2023, 05:30:22 am ---basic modding to add polymer caps with battery usually very noisy power line generated by chip itself, caps to vref , soldered connectors, something else like GDT
--- End quote ---
Not sure what "GDT" is, but essentially just add some ceramic caps to the output of the linear regulator, monitor for heat (using a thermal camera), and see if it works? Can I essentially use any crystal which is faster than the original?
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