Perfect thanks! I like those 1uF caps they look to be a good size to work with.
I see you have the 1uF on the top and the bottom, one pair connected to R IN + and R IN - and same on the left. Does the 1 uF have to match on the + and - pins? I have on another board where it doesn't match, maybe 10 uF on the + and 3.3 uF on the - side. It sounds ok to me? only listened for a few minutes.
The sound signal goes trough both + and - in series (closed loop). If you keep a 10uF cap that could introduce some distortion. Some caps distort and some doesn't.. I would use only the films to avoid distortion from the electrolytics. Another reason for using these is that they are low and close to the ground layer.( They won't pick up as much RFI as the taller stock electrolytics.. They audible hiss went way down after installing these🙂 Btw these sound very neutral and doesnt have a particular sound to them. They are also easy to solder in parallel to each other and I now have 8 of them soldered in. Btw I use the same film type smd for bootstraps since they are a lot more voltage stable than ceramics! The filter tuning won't vary..
(For anyone wanting to save money, two non polar electrolytics in series with a voltage rating of 35V+ could be used in series instead. That would be a total minimum of 8 caps. That's a trick I picked up from a very long capacitor test report I read a while back.)
(For anyone wanting to save money, two non polar electrolytics in series with a voltage rating of 35V+ could be used in series instead. That would be a total minimum of 8 caps. That's a trick I picked up from a very long capacitor test report I read a while back.)
HI irrebeo,
for the non technical.
From these charts, what is the best caps for bootstrap, snubber and input dc blocker in the context of TPA 3116 chip.
thanks
kp93300
for the non technical.
From these charts, what is the best caps for bootstrap, snubber and input dc blocker in the context of TPA 3116 chip.
thanks
kp93300
Got my DUG boards up and running...man they sound sweet!!!
Running "dual mono" with one xformer and dedicated regulated PSU boards running 24V. Antek xformer and Broskie PSU boards...still need to mount the heatsinks.
Running "dual mono" with one xformer and dedicated regulated PSU boards running 24V. Antek xformer and Broskie PSU boards...still need to mount the heatsinks.
This basicly is all below Oscon.
Mica seems to be vey constant across the spectrum.
Got my DUG boards up and running...man they sound sweet!!!
Running "dual mono" with one xformer and dedicated regulated PSU boards running 24V. Antek xformer and Broskie PSU boards...still need to mount the heatsinks.
Very nice! I am envious🙂 I have the Dug boards but no time to solder them up. How many amps can your linear power supply put out? I see you have the CC SER-H inductors good for 15 amps😀
Graphs do not show everything relevant, like distortion and voltage coëfficiënt. Size and leads introduce additional inductance and little resistance too and maybe other things too. I think SMD cog or film most likely best options for most positions if they are available and fit and not made in China🙂
I tried with larger film caps (large but only 10uF) psu caps and it didn't give any bass improvement. The closest cap leg had to be 2 cm to reach down to the chip. The other leg had to be even longer! On the tpa3116 chip the only factors thats crucial is low esr and distance betwen cap and chip in my experience. I've tried most of the recommended caps in this thread so my tip for all the new readers is get the Oscons!
Only the Oscons blew me away when soldered directly onto the chip. Further away from the chip the bass dropped noticably in my setup. In a friends setup with a cheaper but higher sensitivity speakers you couldn't hear any difference between the modded amp and the stock amp. The speaker characterististics often influence the hearable improvements with the mods discussed here.
Only the Oscons blew me away when soldered directly onto the chip. Further away from the chip the bass dropped noticably in my setup. In a friends setup with a cheaper but higher sensitivity speakers you couldn't hear any difference between the modded amp and the stock amp. The speaker characterististics often influence the hearable improvements with the mods discussed here.
Heatsinks for the 3116 chips? Not sure they are necessary. I haven't mounted any on my DUGs yet and after a long, loud listening session they are barely warm. Mind you thats with a highpass crossover at 12db 200hz in my 2-way active system but not much warmer driving full range.
I'm tending to agree with you...running all day today sometimes pretty hard and the chips are barely warm.
w
yesterday we had an 'accidential' listening comparison:
it was a nice sunny day and me and my friend brought two big fullrange to the lakeside.
we were using the red yj 2.0 board i gave to him a while ago in an enclosure that was originally housing an external usb hdd.
the board is in almost stock form.
i just changed the dubious looking dc input caps to chemicons and added four additional caps in hope of better bass output.
i had my sla batteries with me to power the 'set up' (total voltage ~19V).
we were enjoying our reggae music and the sweet weather.
it sounded quite good (under the influence of hops and hemp maybe...).
before we left i wanted to try this very cheap tda7498 board that recently arrived from china:
New good quality TDA7498 100W+100W Class D Amplifier Board Computer Amplifier | eBay
the tda brought a significant improvement!
i had a closer look at the tda board this morning and compared it to its datasheet recommendations.
it doesn't have all the output filters.
i will definitely get another tda7498 board and compare.
i have a slightly modded b/b tpa3116 board (which is back alive) to compare to the tda7498.
i'm looking forward to the ybdz and sure 3116 boards to arrive soon and compete against the cheap stock form tda7498.
it was a nice sunny day and me and my friend brought two big fullrange to the lakeside.
we were using the red yj 2.0 board i gave to him a while ago in an enclosure that was originally housing an external usb hdd.
the board is in almost stock form.
i just changed the dubious looking dc input caps to chemicons and added four additional caps in hope of better bass output.
i had my sla batteries with me to power the 'set up' (total voltage ~19V).
we were enjoying our reggae music and the sweet weather.
it sounded quite good (under the influence of hops and hemp maybe...).
before we left i wanted to try this very cheap tda7498 board that recently arrived from china:
New good quality TDA7498 100W+100W Class D Amplifier Board Computer Amplifier | eBay
the tda brought a significant improvement!
i had a closer look at the tda board this morning and compared it to its datasheet recommendations.
it doesn't have all the output filters.
i will definitely get another tda7498 board and compare.
i have a slightly modded b/b tpa3116 board (which is back alive) to compare to the tda7498.
i'm looking forward to the ybdz and sure 3116 boards to arrive soon and compete against the cheap stock form tda7498.
I went to Roger Modjeski's lab yesterday to help get it organized to hold lab classes for the Berkeley Hi Fi School. Roger has moved part of his Music Reference and Ram Tubeworks operations to the San Francisco Bay Area to start the Berkeley Hi Fi School. I've been offering volunteer help to get the school started.
BERKELEY HI FI SCHOOL | Learning knowledge and truth in audio electronics
I brought my modified Yuan Jing blue amp and my slightly modified Sure Electronics TPA3116 amp for measurements using his Sound Technologies 1700A Series Distortion Analyzer and Hitachi oscilloscope. We used my upgraded Astron RS-12A regulated linear power supply with both amplifiers.
Modified Yuan Jing TPA3116 blue amp
Power..............1kHz..........2kHz..........6kHz..........10kHz..........20 kHz
1 watt............ .03%......... .06%........ .35%......... .60%.......... .80%
10 watts......... .03%......... .20%........ .25%......... .30%.......... .25%
Modified Sure Electronics TPA3116 amp
Power..............1kHz..........2kHz..........6kHz..........10kHz..........20 kHz
1 watt............ .14%......... .14%........ .35%......... .55%.......... .65% (first 2 are in the noise)
10 watts......... .10%......... .13%........ .33%......... .30%.......... .40%
As we went through the measurements, Roger explained the interesting waveforms we viewed on his scope. These amps both exhibited crossover distortion. What's interesting to me is that the THD significantly increases above 6kHz at 1 watt. However, we measured lower distortion at 10 watts. Looking at the TI datasheet, this may explain why they do not show distortion measurements above 6kHz. My hearing rolls off around 16kHz.
Another interesting observation is the amount of noise at 1kHz and 2kHz for the Sure amp. Roger pointed out that the distortion measurements were buried in the noise floor. He also noticed a 0.6dB rise at 20kHz, 1.5dB at 30kHz and 2dB rise at 40kHz. He attributed this to the output filter. We did not see this with the modified YJ blue amp. This may partly explain why I prefer my modified YJ amp (even before adding the CineMags) over the Sure amp.
Time didn't permit us to measure frequency response, but I'll probably bring both amps to the lab for more measurements and listening tests.
BERKELEY HI FI SCHOOL | Learning knowledge and truth in audio electronics
I brought my modified Yuan Jing blue amp and my slightly modified Sure Electronics TPA3116 amp for measurements using his Sound Technologies 1700A Series Distortion Analyzer and Hitachi oscilloscope. We used my upgraded Astron RS-12A regulated linear power supply with both amplifiers.
Modified Yuan Jing TPA3116 blue amp
Power..............1kHz..........2kHz..........6kHz..........10kHz..........20 kHz
1 watt............ .03%......... .06%........ .35%......... .60%.......... .80%
10 watts......... .03%......... .20%........ .25%......... .30%.......... .25%
Modified Sure Electronics TPA3116 amp
Power..............1kHz..........2kHz..........6kHz..........10kHz..........20 kHz
1 watt............ .14%......... .14%........ .35%......... .55%.......... .65% (first 2 are in the noise)
10 watts......... .10%......... .13%........ .33%......... .30%.......... .40%
As we went through the measurements, Roger explained the interesting waveforms we viewed on his scope. These amps both exhibited crossover distortion. What's interesting to me is that the THD significantly increases above 6kHz at 1 watt. However, we measured lower distortion at 10 watts. Looking at the TI datasheet, this may explain why they do not show distortion measurements above 6kHz. My hearing rolls off around 16kHz.
Another interesting observation is the amount of noise at 1kHz and 2kHz for the Sure amp. Roger pointed out that the distortion measurements were buried in the noise floor. He also noticed a 0.6dB rise at 20kHz, 1.5dB at 30kHz and 2dB rise at 40kHz. He attributed this to the output filter. We did not see this with the modified YJ blue amp. This may partly explain why I prefer my modified YJ amp (even before adding the CineMags) over the Sure amp.
Time didn't permit us to measure frequency response, but I'll probably bring both amps to the lab for more measurements and listening tests.
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Thanks for doing this - very interesting to get some real measurements. I think power supply voltage may affect the results substantially. From what I understand the optimum voltage is circa 19v to 21v, and the Astron is 12v? It may improve with higher voltage. As it is, 0.3 to 0.5% is still very good for 10 watts, but I bet it is lower at 19v.
A 100w amp has more headroom, and if gain is not the same, you may just be hearing improvement via more SPL. That is still a very good price for a 100w amp at $13. Is this amp available on Aliexpress as I don't like to buy from ebay.
The new 2014 TPA3116D2 board is out:
Aliexpress.com : Buy Original Hi end DAC chip IC ES9018 free shipping from Reliable chip toner suppliers on YOYO Best Co. LTD
Aliexpress.com : Buy Original Hi end DAC chip IC ES9018 free shipping from Reliable chip toner suppliers on YOYO Best Co. LTD