Comments on: Building an external battery pack for portable electronic devices https://bradlinder.net/2007/07/building-an-external-battery-pack-for-portable-electronic-devices.html Sun, 27 Nov 2016 16:52:26 +0000 hourly 1 https://wordpress.org/?v=6.8.3 By: Anonymous https://bradlinder.net/2007/07/building-an-external-battery-pack-for-portable-electronic-devices.html#comment-14 Thu, 17 Jul 2014 02:03:53 +0000 http://bradlinder.net/?p=282#comment-14 Just FYI to this discussion: The H4 manual says:
[AC adapter operation]
• Be sure to use only an AC adapter which supplies 9 V DC, 300 mA and is equipped with a "center minus" plug (Zoom AD-0006). The use of an adapter other than the specified type may damage the unit and pose a safety hazard.
So that clears up a couple of questions in this thread re. documented external power vs. internal, and also plug polarity.

Sourced from http://www.zoom.co.jp/downloads/h4/manual/

]]> By: Anonymous https://bradlinder.net/2007/07/building-an-external-battery-pack-for-portable-electronic-devices.html#comment-278 Sun, 20 Feb 2011 16:14:03 +0000 http://bradlinder.net/?p=282#comment-278 @ Josephers YOUR MODEL IS NEWER IT MAY NOT GENERATE THAT PULSE NOISE BUT BY BUILDING BATTERY PACK WILL GIVE YOU LONGER RECORDING HOURS – TRY 7.2 VOLT AND THAT SHOULD BE FINE.

]]> By: Josephers https://bradlinder.net/2007/07/building-an-external-battery-pack-for-portable-electronic-devices.html#comment-279 Sun, 20 Feb 2011 16:14:03 +0000 http://bradlinder.net/?p=282#comment-279 The thing is, the AC adapter that came with MY Zoom H4 says that it has an output of 9V at 300mA. The same is said on my Zoom H4… and most times I don't hear that whining noise when on batteries.

]]> By: Anonymous https://bradlinder.net/2007/07/building-an-external-battery-pack-for-portable-electronic-devices.html#comment-296 Wed, 02 Feb 2011 17:18:57 +0000 http://bradlinder.net/?p=282#comment-296 @ Josephers YOUR MODEL IS NEWER IT MAY NOT GENERATE THAT PULSE NOISE BUT BY BUILDING BATTERY PACK WILL GIVE YOU LONGER RECORDING HOURS – TRY 7.2 VOLT AND THAT SHOULD BE FINE.

]]> By: Graham Riches https://bradlinder.net/2007/07/building-an-external-battery-pack-for-portable-electronic-devices.html#comment-295 Wed, 02 Feb 2011 17:18:53 +0000 http://bradlinder.net/?p=282#comment-295 @ Brad..This is a better solution, you can use standard batteries as well as Rechargeble. check this link:

http://www.jprelec.co.uk/store.asp/c=361/Battery-Box-6-x-AA-size

Graham

]]> By: BJ https://bradlinder.net/2007/07/building-an-external-battery-pack-for-portable-electronic-devices.html#comment-310 Mon, 13 Dec 2010 14:07:45 +0000 http://bradlinder.net/?p=282#comment-310 You legend! I've been fumbling around with rechargeable NiMH AA's for ages; they wouldn't last long at all recording on location, and I had to carry a bag-full to share with my lectro radio mics.

A 9.6v 2000mAh batt took 2 hours to charge with a 1A delta charger and took approx 24hrs to drain fully. That's with normal everyday use: switching on/ off, recording at 48khz, but the rest of the time leaving on/rec armed. Plus that high pitched noise is now not present in my recordings. Extremely happy all round!!!

]]> By: pdubber https://bradlinder.net/2007/07/building-an-external-battery-pack-for-portable-electronic-devices.html#comment-384 Thu, 19 Nov 2009 16:41:08 +0000 http://bradlinder.net/?p=282#comment-384 Thinking of making an external battery pack myself. My AC Adapter also says it has an output of 9V at 300mA.

I have measured the actual voltage and current from the adapter with a multimeter. I notice that the numbers are almost identical to those that I get when I measure a standard PP3 (AKA "transistor") 9V battery.

I'm no electronics expert, but what would be wrong with simply hooking up a PP3 battery to a standard PP3 snap that is wired to the proper size DC connector?

Of course, I don't want to blow up my recorder. Any thoughts would be appreciated.

]]> By: Anonymous https://bradlinder.net/2007/07/building-an-external-battery-pack-for-portable-electronic-devices.html#comment-460 Thu, 11 Jun 2009 02:21:27 +0000 http://bradlinder.net/?p=282#comment-460 Well Josephers, It could be that Zoom decided to change some things about the H-4 and one of them was to change the output voltage of the AC Adapter.

I assembled a battery pack as Brad suggested and it works great.. I can turn the recorder on while my band is playing and just let it go.. I have never run out of battery power.. and I do not recharge between every use either.,

]]> By: Josephers https://bradlinder.net/2007/07/building-an-external-battery-pack-for-portable-electronic-devices.html#comment-461 Wed, 10 Jun 2009 20:58:21 +0000 http://bradlinder.net/?p=282#comment-461 The thing is, the AC adapter that came with MY Zoom H4 says that it has an output of 9V at 300mA. The same is said on my Zoom H4… and most times I don't hear that whining noise when on batteries.

]]> By: Lawrence https://bradlinder.net/2007/07/building-an-external-battery-pack-for-portable-electronic-devices.html#comment-466 Thu, 04 Jun 2009 01:53:15 +0000 http://bradlinder.net/?p=282#comment-466 The AC Adapter that came with my H-4 said it had an output of 12 volts.
The original idea of the Radio Shack kit and adaptor is the best idea put forth. I put together a battery pack as Brad recommended. It has worked flawlessly for many months now. Why try another route?

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