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Recaping Victor VC921...
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Re: Recaping Victor VC921...
Good job with the soldering! Sheeeeeeesh, those original solder joints were nasty looking! (Dull, brittle lead-free solder that cracks easily and grows "tin whiskers" AKA tin crystals)
Only other thing I have to say is you used Jamicon capacitors which are of average quality. But they are NOT in a very stressing environment here, so they should be good!Last edited by ben7; 11-24-2013, 02:57 PM.Muh-soggy-knee
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Re: Recaping Victor VC921...
Sorry to wake up a long dead thread, but I thought it worth pointing out that the design of this multimeter has changed.
The new design uses a chip on board (aka little black blob), and more surface mount components. It appears to be based on a variant of the Fortune Semiconductor Corporation FS9XXX series multimeter chips, but exactly which one is difficult to tell as not all pins are broken out. There is a high probability that it is one of these guys... http://www.ic-fortune.com/eng/new_product3_3.asp ... exactly which one.. well your guess is as good as mine.
A full set of teardown pictures here... https://goo.gl/photos/aR3xKELrAAmGa16o7
The interesting thing is that it has a 24c02 i2c EEROM, presumably for settings and calibration. I'll need to try and find the time to read it and see if it reveals anything useful.Last edited by itsthatidiotagain; 01-21-2016, 11:22 AM.
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Re: Recaping Victor VC921...
The Victor VC921 "True RMS" is not a bold unsubstantiated claim.
This variant is based on the HY12P65/HY12P66 the pinout of the little black blob matches this chip *exactly*. (The meter is not as I previously though, based on a Fortune Semiconductor FS9XXX)
This probably makes the "VC921 True RMS" the cheapest true RMS meter on the market (and also probably the lowest build quality )
The HY12P65/66 is in fact a True RMS DMM chip. The board layout out is a similar arrangement to the Victor VC890-X series. It *may* even be capable of RS232 output, time to solder on some very small wires and find out.
Data Sheets, programming info and all things HY12P6X related >> http://www.hycontek.com/e-page2-HY12P.html
The older versions however are *not* based on this chip, and are not true RMS.Last edited by itsthatidiotagain; 01-24-2016, 04:11 PM.
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Re: Recaping Victor VC921...
To the OP: Could you shrink those images? It's loading down our WiFi. Thanks.Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
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Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
sigpic
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