The bass is just clearer so it sounds like its louder, but in fact there's no boost happening.
I noticed a lack of bass with my TPA3116 (on the thread about that chip) and abandoned the chip for that reason primarily. I tried a few ways to try to fix it up, mainly involving huge quantities of capacitance on the power supply. Nothing worked so I reckon the poorish bass is built into the silicon.
On the other hand, the TDA8932 has totally phenomenal bass, there's nothing else like it.
With that attitude you just have to be the same Bare that frequented the RD LC Forum in the mid 2000's
The chip itself is ultra-cheap, under $0.50 but in my experience the SQ is top-notch with an optimized implementation. That means (for me) transformers on input and output. As with all switching amps, the outputs carry a lot of noise and this radiates from output cables. Inputs need to be kept clean in this environment and an input transformer's the best way to maintain what might be called 'EMI hygiene'.
Hi abraxalito, I see very cheap 35W mono TDA8932 modules on ebay like 2,60$ each; what would you reccomend between two of these modules and an already stereo configuration TDA7498 located at this link?
TDA7498 2 100W 2 Channel Audio Stereo Digital Power Amplifier Board DC 15 34V | eBay
I would like to experiment the so well regarded bass you guys are talking about here compared to the TPA3116 chip but I don't know what to choose, is the TDA7498 much more different to the TDA8932 in the bass department?
thanks
I tend to steer away from boards that are using SMT electrolytics for decoupling duty as they don't perform as well as leaded caps. Hence my recommendation for the TDA8932 board which has holes for a leaded part to retrofit an SMT 'lytic. I have no experience at all with the TDA7498 so can't answer your question on how that might sound.
Perhaps we have to look at the specs... Although with the same capacity, low ESR capacitors are a must in audio applications (which translates in current delivery capacity without lowering output voltage).
Capacity is how much energy capacitor can store (like a fuel tank), low output impedance is how large the output pipe is (with same analogy, how much fuel can I delivery/burn per unit of time).
Capacity is how much energy capacitor can store (like a fuel tank), low output impedance is how large the output pipe is (with same analogy, how much fuel can I delivery/burn per unit of time).
Its based on measurements I've made with an LCR meter on a handful of boards that I've bought which have had SMT electrolytics on them. Their ESRs were inferior to leaded capacitors in comparable can sizes.
Ok, I am curious. I have a 3118 board on the way. Built an Amp 6 Basic 5 years back (TA2020) . Considering putting the amp6 into a portable guitar amp speaker as an experiment. Would then need to replace it with something since the 3118 board is going into another project.
Any suggestions for a recommended 8932 board?
Any suggestions for a recommended 8932 board?
I've bought several of these simply because the cap has mounting holes under it for a lower ESR through hole 'lytic to be fitted.
https://www.aliexpress.com/item/TDA..._1&btsid=ce4e4093-4359-4b59-bfe6-4352d1d5908c
Ignore that its saying in the headline that its based on the TDA2030A, its clearly not. Presumably mentioning that device is some devious marketing notion...
https://www.aliexpress.com/item/TDA..._1&btsid=ce4e4093-4359-4b59-bfe6-4352d1d5908c
Ignore that its saying in the headline that its based on the TDA2030A, its clearly not. Presumably mentioning that device is some devious marketing notion...
How did you even come across it then?
I see same/other clown advertising on ebay
35W Mini HiFi Mono Digital Audio Amplifier Circuit Board TDA2030A Class D Module | eBay
Ha, good question
I can't recall exactly but might have been thrown up while I was searching for other amps or chipamps. Originally it was priced about double the price now and had the markings scratched off the IC to hide its identity. To me though it was obviously a TDA8932. It may be that I helped contribute to 'outing' the board as I mentioned it on my blog over two years ago http://www.diyaudio.com/forums/blogs/abraxalito/1131-tda8932-class-d-amp.html ...I have four of the Sanwu blue 3118s in a pair of FAST speakers. The 8 inch woofers are 4ohm impedance.
I want to lower the gain.... (I can can finds the posts and piccies in this thread to show how to do that).
However, I am concerned that there have been comments about the Sanwu 3118 "lacking bass" or having "lower bass levels". Would adding an LPAD to the woofer to bring the impedance up to 8ohms do much to help?
I want to lower the gain.... (I can can finds the posts and piccies in this thread to show how to do that).
However, I am concerned that there have been comments about the Sanwu 3118 "lacking bass" or having "lower bass levels". Would adding an LPAD to the woofer to bring the impedance up to 8ohms do much to help?
Ah, I didn't mention it here but I am finding 4x36dB a little less than granular at the low end of the volume dial. Hence wanting to do the 20dB mod.
Has anyone done and published an output transformer for these (Sanwu TPA3118) amps?
Most other chips have lower damping, then playback is affected by speaker impedancecurve more. In xrk's frequency curves that was visible as a small added peak in bass at 80-100hz compared to 3116, below 80-100hz 3116 had more output. Subjectively the other chip had more/better bass to xrk's ears.
Standard classD troubleshooting bass points to inputside only. Lowering gain affects input.
Standard classD troubleshooting bass points to inputside only. Lowering gain affects input.
Ok so random SMT caps and random TH caps ? I found that there are quite some ultra low ESR caps in SMT form. Caps from reputable brands of course. I tend to replace any electrolytic cap on such boards as I have experienced way too many fake, re-used and doubtful quality electrolytic caps be it SMT or TH. It would be nice to compare same value SMT and TH caps of known good quality.
Doctormord made a nice page on those unknown branded caps that are often used on these amplifier boards:
Günstige Kondensatoren aus China / Taiwan / Asien – #360customs
Not entirely random no. I did verify at least one manufacturer's DS's for both SMT and through hole and at the same can size, the TH cap won out over the SMT one.
Specific recommendations of manufacturers and can sizes please?
That's what I did via the DSs. If you have seen datasheets where the TH caps lose out to the SMT ones for the same can sizes, I'm most certainly all ears.