PDA amp

ebijma · 5th February 2005, 04:18 PM

I have a PDA with a route planner.
Volume of the PDA is much to low for listning while driving the car.
So i build a amp based on a TDA1815 with a small speaker.
The TDA is in bridged mode so the output should be close 24 watts at
12 volt.
Thats allot but i don't use it at full power.
So it doesn't get hot at all.
Works perfect.
But.........................
Do some of you know a filter that filters out the lows?
I only want to hear the frequenty thats been used by the vioce.
I want to filter the input this is at line level.
This is easier on the small speaker.

Hopefully some of you can help me out here.

Thanks

theChris · 5th February 2005, 07:39 PM

look into resistor -- capacitor circuits. rc for short.

they will begin to block high or lows, depedning on the arrangement.

demogorgon · 7th February 2005, 12:15 AM

what you want is a highpass filter, possible a bandpass filter.

Knock yourself out!

-marius

ebijma · 7th February 2005, 07:02 AM

Thanks.

Didn't know it was that easy to find it on google.
But what frequenties should i use for voice?

demogorgon · 7th February 2005, 02:36 PM

well, the bandwith on house phones are 100hz to 3600hz if i remember correct, so you should not go much lower or higher than that, i would not at least..

G4ME · 7th February 2005, 03:45 PM

you also have to take into account what speaker you are using, i imagine that its a small full range, in a small box, that can't go to to low, so i would be conservative and say 200hz and nothing above 4K

ladaniva · 23rd October 2007, 08:24 PM

Hello!

My message is for Ebijma. I am looking for a TDA 1815 record bias IC to fix my beloved Tascam 122.

Do you know where I can find one?

Please contact me at guilsimard"a"yahoo.fr

Thanks!

5th February 2005, 04:18 PM	#1
ebijma diyAudio Member Join Date: Mar 2004 Location: Huizen	PDA amp I have a PDA with a route planner. Volume of the PDA is much to low for listning while driving the car. So i build a amp based on a TDA1815 with a small speaker. The TDA is in bridged mode so the output should be close 24 watts at 12 volt. Thats allot but i don't use it at full power. So it doesn't get hot at all. Works perfect. But......................... Do some of you know a filter that filters out the lows? I only want to hear the frequenty thats been used by the vioce. I want to filter the input this is at line level. This is easier on the small speaker. Hopefully some of you can help me out here. Thanks __________________ Music is what i want, music is what i need

5th February 2005, 07:39 PM	#2
theChris diyAudio Member Join Date: Dec 2001 Location: SIUE, Illinois, USA	look into resistor -- capacitor circuits. rc for short. they will begin to block high or lows, depedning on the arrangement. __________________ if only it could be used for good, not evil...

7th February 2005, 07:02 AM	#4
ebijma diyAudio Member Join Date: Mar 2004 Location: Huizen	thanks Thanks. Didn't know it was that easy to find it on google. But what frequenties should i use for voice? __________________ Music is what i want, music is what i need

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7th February 2005, 12:15 AM	#3
demogorgon diyAudio Member Join Date: Jul 2004 Location: Behind you.	what you want is a highpass filter, possible a bandpass filter. Knock yourself out! -marius

7th February 2005, 02:36 PM	#5
demogorgon diyAudio Member Join Date: Jul 2004 Location: Behind you.	well, the bandwith on house phones are 100hz to 3600hz if i remember correct, so you should not go much lower or higher than that, i would not at least..

7th February 2005, 03:45 PM	#6
G4ME diyAudio Member Join Date: Jun 2003 Location: Location: Location	you also have to take into account what speaker you are using, i imagine that its a small full range, in a small box, that can't go to to low, so i would be conservative and say 200hz and nothing above 4K

23rd October 2007, 08:24 PM	#7
ladaniva diyAudio Member Join Date: Oct 2007	Hello! My message is for Ebijma. I am looking for a TDA 1815 record bias IC to fix my beloved Tascam 122. Do you know where I can find one? Please contact me at guilsimard"a"yahoo.fr Thanks!

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