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im_an_ece_student
New Member

1 Posts
Posted - Jul 29 2011 :  12:30:50 PM  Show Profile  Reply with Quote
Hi Sir Aaron and everyone..

I am an ece student and wanted to do this 22 watt audio amplifier for my project. (http://www.aaroncake.net/circuits/amp20w.asp) <--- link

I am having a problem on how to connect a volume control for the circuit. Also can someone please explain to me the "right in" and "left in", i know that those are for signal inputs, my problem is what would be the connection of the RCA jacks because I'm confused with the gnd in the signal inputs.

I hope someone will answer my questions . Sorry for bad english. Thanks much in advance.

audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Jul 29 2011 :  3:13:29 PM  Show Profile  Reply with Quote
A volume control has three terminals: Input and ground at each end and the slider is in the middle and it connects to the input of the input coupling capacitor of the amplifier.

The RCA jacks connect to the inputs and grounds of the volume controls. The grounds of the RCA jacks and volume controls connect to the ground of the amplifier. The wires from the jacks to the volume controls to the amplifiers should be very short or use shielded audio cables to avoid mains hum pickup.

A stereo volume control has two controls but one shaft rotating them.
a volume control is logarithmic (audio taper), not linear.
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satpambobo
Apprentece

Indonesia
8 Posts
Posted - Aug 05 2011 :  6:52:12 PM  Show Profile  Visit satpambobo's Homepage  Reply with Quote
Hello,.. I'm glad to join this forum, TDA 1554 seem simple,..i have questions 20Watt it means 10 Watt each channel? The power supply 12V it can be portable miniamplifier put in car. isn't ?
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Aug 06 2011 :  12:02:15 PM  Show Profile  Reply with Quote
quote:
Originally posted by satpambobo
TDA 1554 seem simple,..i have questions 20Watt it means 10 Watt each channel? The power supply 12V it can be portable miniamplifier put in car. isn't ?

I don't think the TDA1554 or many other old car audio amplifier ICs are made anymore.
You should look at its datasheet to see its spec's instead of guessing wrongly.
Like most amplifiers, they lied about the power. Its output was 20W per bridged stereo channel when the supply was 14.4V, the speaker was 4 ohms and with 10% of horrible clipping distortion.
With the normal 13.2V in a car the output was about 14W into a 4 ohm speaker or 8W into an 8 ohm speaker just before the output clips.
With a 12V supply then the output was about 11W into 4 ohms or 6.4W into 8 ohms.
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