Homemade Chip Amp Question

wadehavens · 05-09-2009, 10:14 PM

I recently salvaged parts from an old car stereo and found 2 TDA8561q amps inside. Naturally, the first thing I thought of was building myself a guitar amp. I have it all connected and working, however, this is a 4 or 2 channel amplifier and all I need is one channel. My question is, what do I do with the 2nd input and output? Is it safe to just not connect them at all? Or do I run the risk of blowing the amp?
Also, since I'm such a newbe at reading datasheets, I was wondering if someone could tell me what the current requirments for this chip at full power would be. I want to make sure I have the proper power supply to power this chip and my preamp at the same time.

The TDA8561q datasheet is here:
http://www.datasheetcatalog.org/data...s/TDA8561Q.pdf

Thank you!!

Wade

loudthud · 05-10-2009, 04:39 PM

With a 15V supply and 4 ohm load a single channel will draw about 1.6A (rail to rail square wave). A 1.2A supply that can provide 1.6A for short periods should be adequite. The unused inputs and outputs should be left un-connected.

wadehavens · 05-10-2009, 10:23 PM

Thank you very much for the info! It looks like I have everything I need to put this puppy together.

Thanks again,
Wade

05-09-2009, 10:14 PM	#1
wadehavens Junior Member Join Date: May 2009 Posts: 10	Homemade Chip Amp Question I recently salvaged parts from an old car stereo and found 2 TDA8561q amps inside. Naturally, the first thing I thought of was building myself a guitar amp. I have it all connected and working, however, this is a 4 or 2 channel amplifier and all I need is one channel. My question is, what do I do with the 2nd input and output? Is it safe to just not connect them at all? Or do I run the risk of blowing the amp? Also, since I'm such a newbe at reading datasheets, I was wondering if someone could tell me what the current requirments for this chip at full power would be. I want to make sure I have the proper power supply to power this chip and my preamp at the same time. The TDA8561q datasheet is here: http://www.datasheetcatalog.org/data...s/TDA8561Q.pdf Thank you!! Wade

05-10-2009, 04:39 PM	#2
loudthud Supporting Member Join Date: May 2006 Location: Texas USA Posts: 796	With a 15V supply and 4 ohm load a single channel will draw about 1.6A (rail to rail square wave). A 1.2A supply that can provide 1.6A for short periods should be adequite. The unused inputs and outputs should be left un-connected. __________________ WARNING! Musical Instrument amplifiers contain lethal voltages and can retain them even when unplugged. Refer service to qualified personel.

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05-10-2009, 10:23 PM	#3
wadehavens Junior Member Join Date: May 2009 Posts: 10	Thank you very much for the info! It looks like I have everything I need to put this puppy together. Thanks again, Wade

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