Reports

Multi AC adapter

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The right photo shows AD-8723D of DC powr suppy. I was surprised at the price. The price of the specifications was twice or three times a few yeas ago.

EAC-2000
Fig.1 EAC-2000
AD-8723D
Fig.2 AD-8723D

Tbl.1 Ripple
NominalAverageΔV/V
3V3.3-3.4V13%
4.5V4.89V6.5%
6V6.58V9.7%
7.5V8.14V8.9%
9V9.49V5.4%
12V12.1V1.1%
I will adopt cheaper a multi AC adapter with the charger board using IC723. The specifications of EAC-2000 are,

I have 6V batteries. I designed charging two batteries by series. But the dissipation was very big because of 24VDC power supply. EAC-2000 is enought to charge the batteries, though switching supply is much noisy than dropper. I examined fluctuation or ripple of the output of EAC-2000 with no load by DSO.

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