RE: [Harp-L] Kinder Anti-Feedback+ modification

[d peer <dpeer2000@xxxxxxx>]

Three things: voltage, current and regulation

If the two 9-volts are in parallel, then a 9v supply should work; if they're in series, then you'll need an 18v supply

The main reason for having two batteries in parallel is available current. Check the specs for the unit's draw in amps.

Make sure that the AC adapter you use is very well regulated. Remember that batteries supply PURE dc; many AC adapters do not, but recitified AC instead. This is basically a square wave and could harm your device.

---
Love is the music of life;
Compassion is its melody.
  - Don Peer  ( o)==#




 
> From: BluzeHarp@xxxxxxx
> Date: Fri, 16 Oct 2009 12:12:15 -0400
> To: harp-l@xxxxxxxxxx
> Subject: [Harp-L] Kinder Anti-Feedback+ modification
> 
> I picked up a used Kinder AFB+ box a while ago. Seems to do a great job & 
> I'm keeping it, but... It requires two 9 volt batteries and has no power 
> input jack for an external power supply, also no easy access to the 
> batteries, you have to take the four screws out of the cover & take it apart to get 
> to them... grrrr. For the high original price I'd expect to see a battery 
> access door with a drop-in battery hookup instead of the cheesy (and 
> easily damaged if not careful) clip-on connectors, plus a power input jack. 
> 
> I'm going to install a power input jack and am looking for some advice. 
> Is it ok to power both the 9v inputs in a simple parallel circuit from a 
> single clean 9v source? Or, does it require seperate discreet 9v power 
> supplies due to the internal configuration? Anything else I need to be aware of?
> 
> Christopher Richards - 'Twin Tone' Harmonica Microphones
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