RE: [Harp-L] RE: Kinder AFB batteries



John wrote: 
The thing to consider about "converting" a Kinder AFB+ to be
used with wall warts/adapters is the amp draw of the AFB+. 9-volt
adapters
can put out 9-volts at a very low amp rating. They can also put out
quite a
bit of juice at a higher rating (usually stated in milliamps). This is
why
you can't (shouldn't) hook up the adapter from your brand X delay pedal
to
your brand Y reverb pedal; even if the polarity and jack size is the
same." 

Paul wrote: 
I think the danger implied in your post is highly overstated. If the
adapter type is correct (AC or DC) and the voltage is correct, the
chance of damage is virtually nil.  There is a common misconception that
a high-current adapter will "blow out" a small device. This is not so. A
device will only draw as much current as it needs.

>>>Perhaps I wasn't clear in my post. I never said that too high an amp
rating would damage the unit; merely that unless you know for sure what
the amp draw of the AFB+ is, you shouldn't improvise an adapter for it.
A car battery is capable of supplying several hundred amps. The dome
light in a car is not rated at several hundred amps. It pulls what it
needs. Likewise, a Bassman may pull 2A, but we plug them into 20A
outlets every day. The purpose of my illustration with the delay/reverb
pedals was to point out that different units with the same
polarity/voltage requirements do not always have the same current
requirements and that it is not always safe to swap adapters
willy-nilly. Some circuits can handle a significant mismatch. Some
can't. If the tone of my post was taken as "too high an adapter output
might damage the circuit", then I wish to correct that
misunderstanding.<<<


Paul wrote: 
I realize your post was well-intended, but the fact is, a 9-volt
adapter,
properly polarized, is a very good solution to powering the device. I
base
this statement on 30 years of electronics education, development,
design,
and building experience. 

>>>I agree completely. I know you were merely trying to state a viable
answer to a posed question, but the real question in my mind is: Do we
really need a "solution" to powering the unit? John Kinder designed the
AFB+ as a no-nonsense, lightweight, compact, highly portable device that
eliminates feedback. And that's exactly what it is. If you have to
change the batteries every six months, so what? On a crowded stage, the
last thing I want to do is try to locate not one, but two
wall-wart-sized outlets on a power strip.<<<

John Balding
Tallahassee, FL




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