I am serious. BTL exists for ages. Then also many did not understand that the - output was not the same as GND 🙂
https://en.m.wikipedia.org/wiki/Bridged_and_paralleled_amplifiers
https://en.m.wikipedia.org/wiki/Bridged_and_paralleled_amplifiers
I didn't doubt it for a moment...it was derision...🙂
With 12v on board the car ... without btl amp .... it's 2*8 w 4ohms max .... See 12w for those who don't have ears ...🎼
With 12v on board the car ... without btl amp .... it's 2*8 w 4ohms max .... See 12w for those who don't have ears ...🎼
Two questions about the PL-AD-160 board:
- I see that V1.5 has doubled the electrolytics and added a tantalum cap, probably an improvement (though hard to tell by just looking). But it dropped the switches for changing operating mode. Is it still possible to use V1.5 in a 2.1 configuration? Are those solder jumpers I see?
- From the MA12070 Application note on output filters, it looks like THD+N can drop by a couple orders of magnitude by using a lower DC resistance ferrite bead, like Murata BLE32PN300SN1L. Has anyone gotten good results with output filter modifications?
Thanks for the 1.5 update/warning. Replacing the mode switch with solder jumpers is big problem for me. Those resistors are super tiny and are going to be a real problem for me to change. From what I can tell you’re correct: The amp is set for 2.0 BTL operation. I need the 1.0 PBTL configuration which means I’ll need to remove the MSEL0 resistor and then re-install it in the other position. I wonder if any vendors are still selling the 1.4 version. Sigh…
I noticed they also removed the I2C address switch and replaced the I2C connector with through holes for soldering.
PS - For 2.1 operation I think you'll need to remove and re-install both resistors to their alternate locations. This would change from the default (1, 0) to the 2.1 mode (0, 1).
I noticed they also removed the I2C address switch and replaced the I2C connector with through holes for soldering.
PS - For 2.1 operation I think you'll need to remove and re-install both resistors to their alternate locations. This would change from the default (1, 0) to the 2.1 mode (0, 1).
I've found vendors with V1.3, as well. No obvious differences from V1.4. I'd risk some delicate soldering if the V1.5 is a better sounding board. But I've looked through this thread and others without finding anything about the differences between V1.4 and V1.5. Another change is they removed the connector with /MUTE and /ENABLE. It sounds like that was a factor in problems another person was having.
From a designer's perspective, I can relate to wanting to remove users' options if too many of them are going to misuse and break things. If there's a switch, people will flip it to see what happens. If you change this board to 2.1 or 4.0 without decoupling caps, bad things will happen. So is V1.5 is about idiot-proofing, or does it also sound better?
From a designer's perspective, I can relate to wanting to remove users' options if too many of them are going to misuse and break things. If there's a switch, people will flip it to see what happens. If you change this board to 2.1 or 4.0 without decoupling caps, bad things will happen. So is V1.5 is about idiot-proofing, or does it also sound better?
In 1.5 the /MUTE and /ENABLE lines were added to the I2S connector. So now it's a 7 pin connector instead of 5. I asked my AliExpress vendor if the had any documentation on the 1.5 board, specifically with the new mode selector resistors. I'll post here if I hear anything.
The vendor sent me documentation for the Ver. 1.5 PCB which I translated from Chinese to English. They recommend using a 10K resistor even when tying MSEL0 and/or MSEL1 to ground. In my case I'm just going to use a solder bridge to tie it directly to ground. Much simpler (for me) than soldering in a tiny 10K resistor.
Good info, thanks. That's about what I would have guessed looking at the board, but reassuring to have it definite like that.
The other changes I see in the circuit diagram:
The other changes I see in the circuit diagram:
- /MUTE and /ENABLE now have 5 second and 0.1 second delays at power-on, had been 1/2 second for both.
- I2C address is fixed at 0x20.
- Removed clock option for synch with another MA12070
No I was/am busy with a few DACs and... I will be trying an Ifi Zen Stream.
I think I'll skip this MA12070 based device because it has Bluetooth, TL072C and ES9018. That is 3 strikes.
I think I'll skip this MA12070 based device because it has Bluetooth, TL072C and ES9018. That is 3 strikes.
I don't know if anybody already mension this but the PL-AD-160 board don't work with balalanced input if you don't remove R5 and R4.
It's not an resistor just an bridge to GND.😳
I just was confused when I at last bought an DAC with balanced output.
I still need GND, the middle pin to ground to my DAC but now it works without massive noise and hum.
It's not an resistor just an bridge to GND.😳
I just was confused when I at last bought an DAC with balanced output.
I still need GND, the middle pin to ground to my DAC but now it works without massive noise and hum.
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So MSEL0 is already set high and MSEL1 is set low? It's configured BTL but running single-ended unless your remove the bridges and supply an inverted signal?
I dont know about MSEL but sure it just for single ended as default.
Edit:Ofcourse it set to BTL also as default, no switches as the early versions.
They saved a penny...
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Hi. Someone tried use amanero with PL-AD-160 or brzhifi ma12070? How good is the built-in DAC in ma12070?
And someone tried to set quality profile on brzhifi?
theAnonymous1, can u give photo of your modded board?
And someone tried to set quality profile on brzhifi?
theAnonymous1, can u give photo of your modded board?
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I use the digital version of the chip, which ends with a "P", MA12070P. It's noise floor is marginally higher than the analog version, but that's the small price you pay for built in DAC. Sounds ok, and very quiet during normal listening, although I have not measured it yet.
The MA12060P would not work with the Amanero out of the box, as it runs Left Justified I2S, not the standard I2s that the Amenero outputs. You will need to set the register in the MA12070P.
This is easily done with a cheap microcontroller like the ATTiny85. I use this to set the I2S and PMP (quality profile) registers every time the amp turns on.
Setting the quality profile is important as the MA12070 optimizes efficiency by default, not for sound quality. At 6khz, distortion is 0.1% at all output levels - not the best.
You need to set it to PMP2 in the register, so you get the 0.01% distortion as advertised across all frequencies.
I'll post the code to set the registers with the ATTiny if anyone is interested.
The MA12060P would not work with the Amanero out of the box, as it runs Left Justified I2S, not the standard I2s that the Amenero outputs. You will need to set the register in the MA12070P.
This is easily done with a cheap microcontroller like the ATTiny85. I use this to set the I2S and PMP (quality profile) registers every time the amp turns on.
Setting the quality profile is important as the MA12070 optimizes efficiency by default, not for sound quality. At 6khz, distortion is 0.1% at all output levels - not the best.
You need to set it to PMP2 in the register, so you get the 0.01% distortion as advertised across all frequencies.
I'll post the code to set the registers with the ATTiny if anyone is interested.
So, only digital version have quality profiles? brzhifi ma12070 haven't?
Still, how bad is the built-in DAC? I have some DAC on 9018 - audio-gd NFB 11.32 and i want build small music harvester with ma12070 and USB transport and sell my NFB 11.32
does MA12070P have some like SPI or eeprom?
Can u recommend digital MA12070P board for modding?
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Since it volume dependence I wonder when it jumps to PMP2?
"The MA12070 is equipped with an intelligent power management algorithm which applies automatic power mode selection during audio playback. In this state, the amplifier will seamlessly transition between three different power modes depending on the audio level in order to achieve optimal performance in terms of power loss, audio performance and EMI."
https://www.infineon.com/dgdl/Infin...N.pdf?fileId=5546d46264a8de7e0164b750002861a5