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Has anyone looked at the audiobah boards and figured out how to run them in monobloc mode? I have 2 sitting here and hoping to use it as mono bloc mode or even turn the two Chengzhi boards into monobloc.
Chengzhi did some noise prevention, resistors near input, a good thing most others neglected. Also seems the transitor on the right is mute circuit like the green audiobah. But 2 transistors on the left side, is he doing something with sdz chip-pin2 to alter startup time (and switch off time) maybe??? And what about the 2 added larger lytics, mmm... I did buy this pcb from alieexpress, but only cost money and never got pcb, alieexpress/alibaba ignore complaints, never respond, they did do a partial refund (they advertise full refund) but transfered the money to my bankaccount and guess what....transfer cost I had to pay were equal to the partial refund...lesson learnt, no more buying from alieexpress for me
Ordered this board http://www.aliexpress.com/item/Free-Shipping-1pc-TPA3116-Class-D-digital-amplifier-50W-50-W-with-Silent-Sleep-Design/1586764360.html in search of a module that does not make popping sound when turned off (currently has blue board). I have been using SMPS 19V power supply. Poultygeist indicated that a green board may have the silent feature so I searched at Aliexpress. This is my first time to order from Aliexpress, but if I have read your post prior to the order, I may not have pulled the trigger. I do not like dealing with scrupulous merchant. I wonder if others have the same exprerience. I hope to receive the module in 4 weeks.
It looks like this board doesn't have a heat sink which I thought was required on the 50W boards. Also, the specs show 36db gain. Dealing with any of these foreign direct suppliers is a gamble. Even the most well known suppliers are not much help when you have a problem.
This is another green board, layout could be better then audiobah's, but doesn't have transistor muting circuit like audiobah board. It is another seller, so not to worry too much. If seller is ok you don't ever need Aliexpress for anything...
The pop seems to be timing issue, so could be popfree by partselection? You have pop with hiamplifyer boards in PBTL ? In BTL I had, in PBTL I haven't noticed a pop....
Since I've made the prototype ChengZhi TPA3116 amp, I've noticed that the ChengZhi sounds smoother, more relaxed and more spacious than my slightly modified Yuan Jing blue amp. The only thing I did with the YJ was add a pair of 1,500uF / 25V Panasonic FM electrolytics next to the TPA chip. Last weekend, I was jamming to Pink Floyd's "Dark Side of the Moon" at really loud volumes using my YJ amp. On some of the more complex passages in "Time" and "Money," the music started to distort and sound really harsh. It wasn't musical at all, and I was a bit perplexed why I never heard this before, but this was the first time that I probably pushed over 100dB SPL in my man cave.I've read where using too much capacitance close to the amp chip could be detrimental and it bugged me that the ChengZhi sounded so musical, so I decided to experiment with my Yuan Jing blue amp and replace the 1,500uF caps with a pair of 470uF / 35V Panasonic FM caps. The ChengZhi amp has a pair of 470uF / 25V caps that look like Sanyo Oscon caps, but they're some Chinese off brand. I also added a 2,200uF / 25V Panasonic FM on the power supply input terminal blocks. Just like the ChengZhi, the sound was smoother, more relaxed with a larger, deeper soundstage. I ended up spinning a bunch of new vinyl that I recently purchased and enjoyed the music since I had today off from work.I'm not sure if what I heard was what some describe as ringing. The Texas Instruments TPA3116D2 datasheet shows a pair of 220uF caps for DC decoupling.
Sorry I misread your earlier post, hiamplifier sells blue/black boards too, I have the little board, his own design, yep ebay seller with own design lol. My board came without any parts so I don't have full pcb, just parts in plus and minus towards speakers. So I do not connect output -Rch to +Rch nor -Lc to +Lch. I also do not have parts in Lch input, so mine pcb's are different then. Most important is if you want PBTL, is that tpa3116chip knows upon power on startup, meaning from chipside the Lch input pins,2, should be shorted to gnd no caps should be connected, again Lch inputs are rightside of tpachip, to avoid chinese mistake LOL Speakers connected to output +Rch and -Lch will give full power then. Connecting/shorting outputs/parts in output, changes output filter for new situation, could be needed if protectioncircuit spoils normal operation, but most of times you won't notice when efficiency drops to 50% from 95%, SQ could be affected, it seems either way you get too much high freq when things are very wrong in outputfilter.
Hiamplifier seems to be quite knowledgeable on audio electronics. I think he designed/built/modified all the items that he sells on its Ebay shop. He posts once in a blue moon on diyforum. I am thinking of ordering the 3116 board that he designed and sells as a kit (on ebay) so I do not have to do any desoldering. The parts that come with the kit seems decent too. Of course, the kit will cost more than the YJ blue/black board. I am sure that one can get more detailed information on the board from Hiamplifier if run into trouble, if you buy from him. As a disclaimer, I do not know him and has not bought from him before. However, I have a few email exchanges with him on 3116 board and he was helpful and friendly.
Many people commented that the chip never really gets that warm under regular useRegards,
Here's my 3116 setup. I chose Preamp-Amp setup for more flexibility. Preamplifier has 2 switchable inputs, volume is controlled by 128-step relay attenuator, remote controls volume and on/off operation of preamp and amplifier via trigger cable. The amplifier is built on Audiobah "green" board with some modifications. It sounds glorious and looks cute. I even equipped the volume knob with led-lightpipe indicator for better position visibility. Notice how it sits snug between Aikido tube preamp and Wright 2a3 mono.
