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--- In tr-707@yahoogroups.com , Florian Anwander <fanwander@...> wrote:
>
> Hello
>
> On 31.08.12 23:18 , gafbf wrote
> > In the gear is just written 12v DC, I've try one power supply with 100 ampere, and it seem that it is not enough.
> 12V with 100 Ampere is enough to start a diesel trucks engine ;-)
>
> I assume you mean Milliampere (100mA): yes, that is not enough. The
> specs say 300mA. But my experience is: if you use modern wallwart
> powersupply a 500mA is more reliable.
>
> Explanation: the heavy old wallwarts contained a transformer based
> supply with large capacitors, which could catch spikes in the
> consumption quite well. The modern light weight wall warts use a so
> called switching powersupply, which do not have those large capacitor
> anylonger. So they cannot catch those spikes. If the supply is a little
> over dimensioned, a short breakdown does not reach "deep" enough to
> disturb the 707
>
> Florian
>