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EEVblog #315 - Korad KA3005P Review/FAIL

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EEVblog:


Dave.

Psi:
I know that beeper sound, it's using a beeper that requires the micro to generate the tone. (They're cheaper than beeper with internal tone generators)

When you try and generate the ~2kHz by setting/clearing the mcu output pin in software other interrupts will semi-randomly delay the set/clear commands and you get a sound that's dirty like that.

To avoid it they need to use the dedicated hardware timer output pin on the mcu so the tone generation happens independently.
(or a beeper that does the tone generation itself)

snoopen:
Wondering if you'd recommend this over the similarly priced Jaycar lab supply? Looks like they both have an overshoot issue.

This is the one:
http://www.eevblog.com/2009/09/11/eevblog-30-jaycar-bench-lab-power-supply-review/

I recently bought the Jaycar supply, but it's unopened in the box... Thinking I could take it back and get the Korad for the extra $40 or so.

snoopen:
Hmmm on second thoughts, I actually finished watching the last 5 mins of the review. Can see why you say FAIL! :O Oh wells!

Erwin Ried:
It seems M5 memory led is the LOCK led:
http://www.ebay.ca/itm/KORAD-PROGRAMMABLE-PRECISION-VARIABLE-30V-5A-DC-POWER-SUPPLY-DIGITAL-LAB-GRADE-/110888868115?pt=BI_Electrical_Equipment_Tools&hash=item19d17dd913

by the pictures

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