| ebijma |
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 |
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| theChris |
look into resistor -- capacitor circuits. rc for short.
they will begin to block high or lows, depedning on the arrangement. |
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| demogorgon |
what you want is a highpass filter, possible a bandpass filter.
Knock yourself out!
-marius |
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| ebijma |
Thanks.
Didn't know it was that easy to find it on google.
But what frequenties should i use for voice? |
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| demogorgon |
| 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.. |
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| G4ME |
| 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 |
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| ladaniva |
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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