[ARC5] Audio Booster

[Brooke Clarke]

Hi:

There are many eBay items if you search for "PAM8403 amplifier". There's also a PAM8610 which is a 2x15W version that 
runs on 12V (7 to 15 VDC).
The data sheet for the PAM8403 shows that it's a Class D amplifier with a max supply voltage of 5.0 VDC. There should be 
RFI filtering on both outputs (suggested ferrite bead + 200 pF cap).
https://www.kyohritsu.jp/eclib/OTHER/DATASHEET/pam8403.pdf
https://www.haoyuelectronics.com/Attachment/PAM8610-Audio-Amplifier-Module/PAM86_datasheet.pdf

I've been looking for a replacement for the Radio Shack 277-1008.  It was a hand held amplified speaker that ran on a 9V 
battery or an external power adapter.
Here are some amplified speakers, some a little larger:
https://prc68.com/I/Music.shtml#Speakers

-- 
Have Fun,

Brooke Clarke
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
> For my attempt to boost the audio from the radio in my airplane I tied a little module available from All 
> Electronics, their Catalog Number AMP-8403VC.  It is quite small, about twice the size of a postage stamp, has stereo 
> capability and features a built in pot for a volume control that also has an on/off switch.  It runs just fine on 
> three AAA cells.  Cost is $4.50 each.
> I built the circuit into a metal box that had been the noise blanker for some 1960's vintage military receiver.  Input 
> impedence measures about 48K ohms and output is supposed to be into 3 watts into 4 ohms.
> I had a bit of difficulty getting the amp to interface properly with the airplane radio. 600 ohm output,  and added a 
> 2.4K resistor in parallels accross the input to try to fix that.  In the end the problem turned out to be the 3.5 mm 
> audio cable not interfacing properly with the airplane jack.  I made another cable, 3.5mm on one end and 1/4 in stereo 
> plug on the other and it started working well. The 4 ohm output worked fine into the airplane 600 ohm headset.  I'll 
> have to see how it does in flight.
> So if you need some audio boost, one of these units might do the job for you.
> 73's!
> Wayne
> WB5WSV
>
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