I am looking for the best amplifier chip for use in a 12 volt portable guitar amplifier. The best I have found so far is the ST TDA7492MV. This will provide about 8 watts into 8Ω @ 10% THD. Is there a better alternative?
U can use TDA7377
this works with 12 volt and have 3 mode for use:
1. 4x15w output
2. 2x15 + 1x30w (2.1) output
3. 2x30w output on 4 ohm
i use it.it is very good chip for portable amp.
for more details download datasheet.
this works with 12 volt and have 3 mode for use:
1. 4x15w output
2. 2x15 + 1x30w (2.1) output
3. 2x30w output on 4 ohm
i use it.it is very good chip for portable amp.
for more details download datasheet.
I second this. For the sub-2$ that one of those little blue TPA3118 boards (ie. a complete amplifier, not just the chip) will cost you, you'd be hard-pressed to find anything better.
Since the application is a guitar amp, ie. a mono application, those PBTL (mono) boards are just fine.
I used a couple in my pair of "franken-recycled" surround speakers, that i put together last week, and they work great 😀
Since the application is a guitar amp, ie. a mono application, those PBTL (mono) boards are just fine.
I used a couple in my pair of "franken-recycled" surround speakers, that i put together last week, and they work great 😀
The TDA7377 is Class-AB and (as all AB amps) very ineffective for portable use as idle (quiescent) current is high compared to Class-D. Beside that it has low efficiency at low volumes.
Quiescent current is already 150mA -> 1.8W heat for nothing.
The problem here is the 8R (guitar) chassis. At 12V it gives 9W (10%) at best (on a full bridged amp). You need more voltage here. For twice the volume you'll need 10x the power -> 90W is needed. With an 8R chassis, this leads to 38-40V for the amp (Bridged BTL).
(A 4R chassis would makes things easier.)
I'd recommend a Class-D TPA3250 here, but these aren't available without case actually, so best bang/buck is a TPA3255 like:
Class D TPA3255 MINI HIFI AUDIO Digital Amplifier Board 300W + 300W DC50V-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
Together with a 250W Boost converter like:
Adjustable DC-DC Boost 10A 250W Step-up Constant Current Power Supply LED Driver | eBay
These are TL494 based and do a good job up to 200W.
If you're on a budged, you may substitute the TPA3255 with a TDA7498E running at 39V:
TDA7498E 160W+160W digital stereo amplifier board PBTL 220W mono channel 24v-36v | eBay
Quiescent current is already 150mA -> 1.8W heat for nothing.
The problem here is the 8R (guitar) chassis. At 12V it gives 9W (10%) at best (on a full bridged amp). You need more voltage here. For twice the volume you'll need 10x the power -> 90W is needed. With an 8R chassis, this leads to 38-40V for the amp (Bridged BTL).
(A 4R chassis would makes things easier.)
I'd recommend a Class-D TPA3250 here, but these aren't available without case actually, so best bang/buck is a TPA3255 like:
Class D TPA3255 MINI HIFI AUDIO Digital Amplifier Board 300W + 300W DC50V-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
Together with a 250W Boost converter like:
Adjustable DC-DC Boost 10A 250W Step-up Constant Current Power Supply LED Driver | eBay
These are TL494 based and do a good job up to 200W.
If you're on a budged, you may substitute the TPA3255 with a TDA7498E running at 39V:
TDA7498E 160W+160W digital stereo amplifier board PBTL 220W mono channel 24v-36v | eBay
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