Stereo headphones and the ProtoBoard?

simonl · 2007-06-26 09:34

Hi All,

I'd like to output sound (starting with Chip's excellent demos) form a ProtoBoard, but am having trouble finding a suitable stereo amp.

Has anyone else managed to output stereo sound to headphones? What did you use?

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Cheers,

Simon

www.norfolkhelicopterclub.co.uk
You'll always have as many take-offs as landings, the trick is to be sure you can take-off again ;-)
BTW: I type as I'm thinking, so please don't take any offense at my writing style

Leon · 2007-06-26 10:43

I tried the software on my home-made board, putting the output into the line input on my DAB radio. It sounded quite good.

Leon

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Amateur radio callsign: G1HSM
Suzuki SV1000S motorcycle

simonl · 2007-06-26 10:52

Hi Leon,

Thanks for the reply.

So, you just took wires from the two prop' pins to a plug, and placed that into line-in on the DAB?

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Cheers,

Simon

www.norfolkhelicopterclub.co.uk
You'll always have as many take-offs as landings, the trick is to be sure you can take-off again ;-)
BTW: I type as I'm thinking, so please don't take any offense at my writing style

Leon · 2007-06-26 12:08

Yes, that's basically it. I had the RC filter circuit as used on the demo board on my board, on the output pins. I had the radio set to to audio input. I often use it if I need an audio amplifier for test purposes.

Leon

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Amateur radio callsign: G1HSM
Suzuki SV1000S motorcycle

parts-man73 · 2007-06-26 12:21

I've soldered a few caps and resistors to my Protoboard, along with a stereo jack. I've used Paul's example from this thread - http://forums.parallax.com/showthread.php?p=606294 duplicated for each sound pin (P10+P11)

Then I just use the amplified speakers from my computer. It works very well.

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Brian Meade

"They who dream by day are cognizant of many things which escape those who dream only by night" - Edgar Poe

simonl · 2007-06-26 14:17

Hmmm, so I could do something like the following then?:

Pin 10 (R) --- 200&#937; ---- 10µF ------------------+
                     |            +-------+     |
                     |            |       |--- --- -
                   0.1µF          | JACK  |   |   |  >
                     |            |       |--- --- -
                     |            +-------+ |      |
                    GND --------------------+      |
                     |                             |
                     |                             |
Pin 11 (L) --- 200&#937; ---- 10µF ---------------------+

The stereo jack would then plug into the line-in on my PC?

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Cheers,

Simon

www.norfolkhelicopterclub.co.uk
You'll always have as many take-offs as landings, the trick is to be sure you can take-off again ;-)
BTW: I type as I'm thinking, so please don't take any offense at my writing style

Graham Stabler · 2007-06-26 15:04

yep

parts-man73 · 2007-06-26 15:27

one minor correction - you need to add a 0.1 uF cap between gnd and the junction of the 200 ohm resister and the 10 uF cap for pin 11 also.

Instead of plugging into the "line-in" jack on the computer. I just unplug the speakers from my computer and plug the speakers into the jack on the protoboard. Most computer speakers have a built in amplifier anyhow.

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Brian Meade

"They who dream by day are cognizant of many things which escape those who dream only by night" - Edgar Poe

Graham Stabler · 2007-06-26 15:29

good catch, yes the circuits for each channel should be the same.

Graham

simonl · 2007-06-27 08:16

Aha, you spotted my deliberate (honest!) mistake

Brian / Graham; many thanks.

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Cheers,

Simon

www.norfolkhelicopterclub.co.uk
You'll always have as many take-offs as landings, the trick is to be sure you can take-off again ;-)
BTW: I type as I'm thinking, so please don't take any offense at my writing style

Stereo headphones and the ProtoBoard?

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