dead speakjet

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crchisholm
Posts: 3
Joined: Tue Mar 06, 2012 6:30 pm

dead speakjet

Post by crchisholm » Tue Mar 06, 2012 6:36 pm

I think I got a dead speakjet. I tried to use the simple demo circuit and got nothing from the chip. The demo schematic shows a 120 ohm speaker and I think they must mean 12 ohm. I didn't have a 12 ohm but tried a 10 and an 8 and neither gave me anything. Did I screw up or is it possible the chips is just dead?

CS Paul
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Joined: Fri Apr 02, 2010 7:37 am

Re: dead speakjet

Post by CS Paul » Wed Mar 07, 2012 9:40 am

The right folks probably won't see your post here. I would recommend putting something up in the Technical Discussions area. Failing a response there, you can always email techsupport@sparkfun.com.

crchisholm
Posts: 3
Joined: Tue Mar 06, 2012 6:30 pm

Re: dead speakjet

Post by crchisholm » Wed Mar 07, 2012 9:52 am

Thanks

Duane Degn
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Location: Chubbuck, Idaho, USA
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Re: dead speakjet

Post by Duane Degn » Sun Jul 01, 2012 12:34 pm

crchisholm wrote:I think I got a dead speakjet. I tried to use the simple demo circuit and got nothing from the chip. The demo schematic shows a 120 ohm speaker and I think they must mean 12 ohm. I didn't have a 12 ohm but tried a 10 and an 8 and neither gave me anything. Did I screw up or is it possible the chips is just dead?
I think they were serious about the 120 ohm speaker. I think this would be a headphone type speaker.

An 8 ohm speaker might have ruined you chip.

I used mine with a Veho 260 powered speaker. I think you could use the SpeakJet's output to drive the "line in" port of a computer speaker.

I posted a video of my SpeakJet chip driving the Veho 360 in post #9 of this thread.

http://forums.parallax.com/showthread.p ... ost1107447

The picture of the breadboard isn't very clear, but it might help you some.

I connected the SpeakJet's output to the tip of the 1/8" connector and the sleeve to ground.

It's often a good idea to have the signal pass through a capacitor before it connects with the speaker so it only passes the AC portion of the signal.

IIRC, I was able to get sound from the Veho speaker by both directly driving it from the SpeakJet chip and also with the speaker capacitively coupled with the SpeakJet chip.

FYI, Parallax has just come out with a new text to speach module, the Emic II.

http://www.parallax.com/StoreSearchResu ... fault.aspx

It costs a little more than using the SpeakJet and TTS256 chips combined, but it produces much better quality speech and has nine different voices.

Monday is the first day they'll be shippping these.

Joeisi
Posts: 418
Joined: Thu Apr 26, 2012 6:59 pm
Location: Lima, OH

Re: dead speakjet

Post by Joeisi » Sun Jul 01, 2012 7:59 pm

I don't think it was dead, but now it just may be. The current you sunk (or sourced) through that chip might have been the thing that made it bite the dust. Sorry about your luck. :/ oh, and RTFM and FollowTFM fits well here.

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