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Old 16th May 2007, 06:28 AM   #1
batista is offline batista  Thailand
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Red face Hi did u know

Hi all DIY Friend
From pic
.............................................
R5 @ 3 R2 Upper Frequency Cut-off Poor High Frequencies
Attenuation

C8 9 1
2pBR1
Upper Frequency Cut-off Smaller Bandwidth Larger Bandwidth
................................................
My spk respond frq 50khz-20khz 25w
i use my power amp tda2030
when music has bass i take down eq bass down( my spk is danger it dont like it )
All diy friend know value of c8 use for tda 2030 cut off frq upper 60hz or 80hz please tell me thank u
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Old 18th May 2007, 01:21 AM   #2
NIC1138 is offline NIC1138  Brazil
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Just calculate it!...

But C5 and R5 determines the upper cut-off frequency, and not the lower...

If you used R1 = 22k and R2 = 680 ohms as the datasheet recommends, then

R5 = 3 * 680 = 2040

for an upper frequency cut-off of 20kHz,

C5 = 1 / ( 2 * pi * 20000 * 22000 ) = 362nF

To adjust the LOWER Frequency cut-off, you have to modify C1 and R3. For an R3 of 22k,

60Hz:
C1 = 1 / ( 2 * pi * 60 * R ) = 120nF

80Hz:
C1 = 1 / ( 2 * pi * 80 * R ) = 90nF

So you should take perhaps a 100nF capacitor for your amp...


The recommended value in the datasheet is 1uF, what gives
f = 1 / ( 2 * pi * 1u * 22k) = 7.23Hz
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Old 18th May 2007, 07:56 AM   #3
batista is offline batista  Thailand
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Thank you sir
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Old 18th May 2007, 12:48 PM   #4
NIC1138 is offline NIC1138  Brazil
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Looks pretty... Is it three channels, and a couple of regulators and rectifiers!?... What chips are you using for them?...
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