I'd have to agree. Most people judge the DC coupling caps I use to be "bad caps", although I've used many times with no bother. But they provided a vast improvement over the stock fitted caps!!!
I know this is OT, but just wondered if you guys ever wonder about grass is greener? I have been a die-hard class D TPA3116D2 fan. But I thought I would give the other world of class AB a try. I couldn't pass up this amp for $40 on Aliexpress. It just came today and I will give it a test. I will discuss over in Chip Amp forum.
Ordered boxed Breeze audio model, (cost about 25€ shipped) Going to change parts according diyaudio TPA3116 wiki.
Hey, concerning parts: Have people compared different kinds of resistors and their effects in this board? There are quite small amount of them and i wondered if i dare to invest Ohmite thick film resistors. Its going to cost about 2,5€ /pcs but normally if you rebuild A/B amp with dozens of them with these its going to cost much more.. Maybe i try.
TA310PA20K0JE Ohmite | Mouser
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TA310PA20K0JE Ohmite | Mouser
Interesting, but that's a high cost resistor for this application. Are you convinced of the higher cost translating into greatly improved quality?
Personally I have always opted for solid carbons, or foil wraps by reputable manufacturers. Can be got for €0.43 each.
My golden rule for resistors is avoid wirewounds, and helix engraved types!!
But what do I know! lol.
Im not convinced, i just want to try. They look cool and have heard that thick films are cream´ of resistors. Btw. Now that i change inductors in this Breezeaudio amp and place order at Mouser, could i choose inductors that are better suited for 4ohms? What value? And do i have to change other like cap values as well if i go for 4 ohm optimized inductors?
If I ever resorted to films in previous endeavours I always used thin film.
Output filters are my next challenge!
Between these two amps:
Yuan Jing Audio - ON SALE! - TPA3116 Class-D 2.0 Stereo Amplifier Board + Anti-Pop - USD $13.99 - Class-D & T
Yuan Jing Audio - ON SALE! - TPA3116 Class-D 2.0 Stereo Amplifier Board [50W+50W] - USD $16.99 - Class-D & T
The only deference I see is the Rated Output Power.
How the power is delivered e.g. 50W@4Ohm, 100W@8Ohm, or vise versa?
Maybe this is the problem with low output (depending on the speaker).
Yuan Jing Audio - ON SALE! - TPA3116 Class-D 2.0 Stereo Amplifier Board + Anti-Pop - USD $13.99 - Class-D & T
Yuan Jing Audio - ON SALE! - TPA3116 Class-D 2.0 Stereo Amplifier Board [50W+50W] - USD $16.99 - Class-D & T
The only deference I see is the Rated Output Power.
How the power is delivered e.g. 50W@4Ohm, 100W@8Ohm, or vise versa?
Maybe this is the problem with low output (depending on the speaker).
I've read that thick films are noisier than thin films or metal films.
Here:
http://www.newark.com/pdfs/techarticles/susumu/PTM.pdf
Thin and thick film » Resistor Guide
http://www.digikey.ca/Web Export/Su...Stackpole_ThickFilmXThinFilm.pdf?redirected=1
Thin-Film Chip Resistors Challenge Traditional Thick-Film Devices | Passive Components content from Power Electronics
Thanks for wakeup
I messed those with bulk metal foils and these metal foils are not going to go this amp even i would skip nightlife and save money this weekend: (over 20€/pcs ! )
Y145320K0000V9L Vishay Precision Group Foil Resistors | Mouser
Concure. I have always found thick films "noisier". Although without measuring equip I just relied on fact the thin films always produced better sounding system.
I use carbon composite if available. Allen Bradley resistors. But they are harder to come by, a great composite alternative is Arcol composites.
Although haven't tried as yet, Amtrans AMRG carbon films are meant to be very good. They are a replacement to the Riken Ohm carbon film resistors.
Biggest issue with thick films is their temperature coefficient.
If you poke them in an audio filter circuit, I/V converter or some other application where the audio envelope determines how hot they get, the audio envelope can dynamically change their resistance causing distortion and/or causing the circuit characteristics to change in a way you don't want.
Learned this lesson many years ago when I started out working on broadcast equipment. "50mW dissipation in a 100mW rated cheap 1% resistor? That'll be fine" ... spent a good bit of time trying to figure out why the circuit THD went to hell at low frequencies.
If you poke them in an audio filter circuit, I/V converter or some other application where the audio envelope determines how hot they get, the audio envelope can dynamically change their resistance causing distortion and/or causing the circuit characteristics to change in a way you don't want.
Learned this lesson many years ago when I started out working on broadcast equipment. "50mW dissipation in a 100mW rated cheap 1% resistor? That'll be fine" ... spent a good bit of time trying to figure out why the circuit THD went to hell at low frequencies.
I have a few of the blue/black boards and have enjoyed them a lot and they are easy to modify. I have had some problems with the anti pop boards. One arrived doa and is being replaced. Another worked well when I first hooked it up but has since died. I don’t know what I did to to bugger it up. Service at YJ is good and there was no problem getting a replacement sent out.
Hope this helps.
My current favorite TPA3116
The $10.99 dual chip paired with a $22 Pyramid regulated ( Walmart online ).
The $10.99 dual chip paired with a $22 Pyramid regulated ( Walmart online ).
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