[ARC5] Audio Booster Part 2

[hwhall at compuserve.com]

I've been curious whether those stereo outputs could be combined/paralleled some way without blowing up the chip. I'm ordering some stuff today & plan to get some of those & the slightly cheaper (no vol control) version for "blowing up" testing.
In the meantime, I'd rediscovered a few little Jameco kits that I bought at the (now closed) local surplus store. Packaged as DK-27 TDA7052 1W Power Amplifer kit. The kits have 1-inch square PC boards, so they don't take up a lot of room, but I don't find that Jameco still makes them. Haven't put any together yet but plan to soon.
The TDA7052 chip looks interesting & apparently still available. It's a 1.1W max single channel amp, 8-pin DIP, can run off 3 - 15 V, & outputs to 8 ohms directly. Shares grounds with input & power but the speaker output lines are floated (like the little All Electronics amps). The kit includes 2 resistors (vol control) & 3 caps (input coupling & power bypassing).
 A datasheet PDF is here:https://www.nxp.com/docs/en/data-sheet/TDA7052.pdf

WayneWB4OGM

-----Original Message-----
From: Robert Eleazer <releazer at earthlink.net>
To: arc5 at mailman.qth.net
Sent: Mon, Mar 22, 2021 2:18 pm
Subject: [ARC5] Audio Booster Part 2

 As y'all might recall, I wanted an audio booster I couldplug into my airplane radio and get a little more volume for weakersignals.  I found a little 3W audio amp at All Electronicsand put it in a small aluminum box, powered by 3 AAA cells. Eventually I found out that the little amp uses threedifferent grounds, one for each side of the stereo output and one that is thesame for both the audio input and the power input.  The audio output andthe audio input cannot use the same ground; the circuit does not work ifyou tie those two together. And since the airplane uses a common ground foreverything that means not only that you cannot use a metal faceplate tomount the imput and output jacks, but you also need an isolationtransformer on the input.  I made a plastic faceplate out of Lexanand used a Radio Shack 1000 ohm CT to 8 ohm secondary transformer thatI happened to have on hand. It looks like it is going to work in theairplane, the only question being if it provides enough audioboost to do some good.  And since I have a couple ofdiscarded plastic cased stereo speakers on hand I plan to buy a couplemore of those little amps and install them in the speaker cases for use withboatanchors. WayneWB5WSV           

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