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Chip Amps Amplifiers based on integrated circuits

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Old 20th January 2013, 04:35 PM   #31
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That IC will deliver10 to 12 W into 4 Ohm, and whether it is louder than the car depends on the speaker sensitivity.

Speaker protection does not have to do with the DC blocking cap. You don't need the cap, because it is a BTL configuration. The speaker protection only works as long as the IC is OK. If one of the output transistors blows, it will not help.
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Old 23rd January 2013, 07:35 PM   #32
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Yea I realize but if we start out with the same 83dB@1W sensitivity speaker on both a 2.5W and a 10W setup its a difference between 86dB and 92dB+. I don't have a sound level meter but I prefer to err on the side of loud.

OK so no DC blocking cap, got it.
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Old 30th January 2013, 09:54 AM   #33
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Okay so I got a couple TDAs in the mail. Working on designing a PCB to make things simple. Attached is my schematic so far.

Cap in audio signal is planned to be:
http://www.mouser.com/ds/2/315/ABD0000CE29-44537.pdf

Resistors:
http://www.mouser.com/ds/2/427/cmfind-111261.pdf

and cap on the power lines will just be a generic ceramic.

How's it look?
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Old 30th January 2013, 04:29 PM   #34
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You need 8,5 V or more on pin 11, otherwise the IC will stay muted.
You should also put a big electrolytic on the PCB in parallel to the ceramic.

It is good practice to connect unused inputs to ground. And it cannot hurt to connect supply voltage 2 as well.
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Old 31st January 2013, 05:53 AM   #35
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I think I came up with an elegant (read overly complicated) implementation.

Defaulty R4 is not installed and the radio operates in Mono mode with jumper SV2 on pin 1 and 2.

However if you remove R1-4, jumper R1, jumper from the connector side of R2 to the far side of R4 and set the jumper SV2 to pin 2 and 3 you enable stereo.

X1 and X3 are there so if I ever get a proper switched two channel pot I can wire up a quick loom between X1 and X3 and it. Or in mono a switched single pot can be connected to X1. Otherwise the connectors can have a short jumper there and volume control only on the connected device.
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Last edited by ForeverSka; 31st January 2013 at 05:57 AM.
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