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Electronics => Electronics => Topic started by: yokoma on May 01, 2008, 12:48:49 PM

Title: GP2Y0A700K0F IR noise in SPO256 speech synthesizer
Post by: yokoma on May 01, 2008, 12:48:49 PM: Hi
I am using two GP2Y0A700K0F IR sensors with an SPO256 speech synthesizer IC but the problem is that when I connect the sensors to circuit i always hear high frequency voice on speaker, I am connecting a capacitor between my supply and ground but this is not solving the problem
plz help......
Title: Re: GP2Y0A700K0F IR noise in SPO256 speech synthesizer
Post by: Admin on May 01, 2008, 08:29:16 PM: What type of capacitor? What value?

It definitely sounds like electrical noise from the IR sensor is being passed to the speech IC. Keep both devices as far apart as possible, and add some .1uF, 1uF, and 10uF ceramic caps on the + and - of the speech IC.

Let me know how that goes . . .

ps - I changed your subject "URGENT HELP NEEDED PLZ" to something more useful ;)
Title: Re: GP2Y0A700K0F IR noise in SPO256 speech synthesizer
Post by: yokoma on May 02, 2008, 12:57:35 AM: First f all thank you admin for your reply.....
Right now I am using 10uF electrolide capacitor but between main + and - of my main circuit supply.I will change it and see the result :)
Title: Re: GP2Y0A700K0F IR noise in SPO256 speech synthesizer
Post by: Tsukubadaisei on May 02, 2008, 04:08:14 AM: Some times not only a capacitor, but a inverted diode is also a nice option(inverted diodes are variable capacitance capacitors). If you know basic electronics and control theory, I advise you to have look at them.
Title: Re: GP2Y0A700K0F IR noise in SPO256 speech synthesizer
Post by: yokoma on May 14, 2008, 08:51:43 AM: Quote from: Admin on May 01, 2008, 08:29:16 PM
add some .1uF, 1uF, and 10uF ceramic caps on the + and - of the speech IC.

Let me know how that goes . . .

Hi Admin....
I wanted to tell you that the capacitors did not solve my problem, thus i used separate supply for GP2Y0A700K0F and SPO256 to remove the noise.