The board has the Wima 1.0uF and Panasonic FM 1,500uF caps ...however since I have several of the boards I'll run it with the CC inductors for a while and see if it settles out..
I'll give it more hours see if it settles...it did not sound bad to me ...it seemed the upper midrange lost some depth and noticed more sibilance sssss.
for me that is about what fm/fr panasonics do, very detailed and powerfull bass enhanced mids, more forward, s,t,c many first letters of words become highlighted, but (real) high frequency detail/energy is lost, imaging is poor. Smaller values do better I heard.
But why do well, even simular specced inductors sound different? 1 thing I read in one of the datasheet was about orrientation off the coil windings, should not be parallel to pcb. The filter stores energy too I read, and don't know if sensable but when you measure the inductors for capacitance meter does say charged and quite high uF values till charge is gone.
"coil windings should not be parallel to pcb"
well hell, I don't see how you can get those larger flat-wire wound coil craft inductors on the blue YJ board without at least one of them laying flat to leave room for the power input block.
I got some and am about to install and I got 3 of them to stand up but the one on the power block side must lay flat unless you relocate the power input terminal to the bottom of the board.
And you have to move various other parts to the bottom of the board to even get to that point.
well hell, I don't see how you can get those larger flat-wire wound coil craft inductors on the blue YJ board without at least one of them laying flat to leave room for the power input block.
I got some and am about to install and I got 3 of them to stand up but the one on the power block side must lay flat unless you relocate the power input terminal to the bottom of the board.
And you have to move various other parts to the bottom of the board to even get to that point.
article I read also stated that almost all shielded inductors were made that way unfortunately, was TInote I believe
And they're shielded so what does of matter. Also it so easy to desolder that getting the large cc on there is not that big a deal and the bootstraps need replacing with proper values anyway.
good to know.
Just a pain to fit everything AND have the board in a small case.
I guess I am also in the "just sell me a YJ board with chip and SMD parts installed" at this point as well...
Just a pain to fit everything AND have the board in a small case.
I guess I am also in the "just sell me a YJ board with chip and SMD parts installed" at this point as well...
Is there any reason this might be bad? I.e., any sonic issues to moving components to the bottom of the board, real, imagined, theoretical or otherwise?
I thought this was interesting: borstyAudio: 2x125W Class D Amplifier. Interesting in that he uses the Coilcraft SER2915 inductors that seem to be a good fit for the tpa3116 output filter. (Although, I use the word "fit" somewhat loosely, as the performance specs seem to be a good fit, but physical fitness is another issue.)
Now we need a new tpa3116 PCB designed from the start with room for the big Coilcraft inductors. Another opportunity for the Danzz/Yuan-Jing "partnership". 🙂
I was thinking, would it be bad to create longer leads to the inductors? What I was thinking, is, what if the big CC inductors could be neatly "stacked" on the YJ blue/black PCB, by using wires to connect their leads to the PCB solder pads? Then use something like a zip-tie to hold everything in place?
What do you guys think about the Bourns 2201-V-RC/2205-V-RC (10uH/22uH) inductors? The Mouser page says they are shielded. They have higher current handling and lower DCR than the other Bourns inductors that were suggested in this thread (2100HT-xxx-V-RC). Looks like the inductance drop at saturation current is higher, but the current rating is so high, I think it's impossible to saturate with the tpa3116. (I guess we'd have to see the curve.)
I was looking for some inductors that have good specs but also are easier/cleaner to use on the YJ blue/black PCB. Problem is, there are about a billion inductors. I can use websites like Mouser and DigiKey to filter by the specs that seem relevant, but I have at best a superficial understanding of the information, so it's not optimal.
Also, side note, has anyone noticed that the YJ board direct from YJ is no longer on sale, and is now $30 USD? They can still be had from other sellers on eBay for closer to $20 USD though.
there also seems to be a difference between AC resistance and DC resistance of inductors, thick wires usually have lower DC resistance, thinner wires lower AC resistance??? anybody know if that matters??
I used the CoilCraft (CC) that were shown in one of the pics somewhere a bit earlier in this thread. Model: SER2915L-103.
Fitting them was a bit tricky indeed, but for the two middle ones I simply soldered a bit bit of wire to them to place them - more or less - upright into the middle ogf the booard.
Concerning Panasonic FM - to my ears they produce indeed this harsh sss-sounds that I simply cannot stand (same goes for the white Mundorfs -IMO) - so perhaps it's those rather than the coils?
Those bootstrap caps - what function do they have and why would a larger value perhaps be beneficial?
Enquiring minds would like to know.
Fitting them was a bit tricky indeed, but for the two middle ones I simply soldered a bit bit of wire to them to place them - more or less - upright into the middle ogf the booard.
Concerning Panasonic FM - to my ears they produce indeed this harsh sss-sounds that I simply cannot stand (same goes for the white Mundorfs -IMO) - so perhaps it's those rather than the coils?
Those bootstrap caps - what function do they have and why would a larger value perhaps be beneficial?
Enquiring minds would like to know.
some versions of YJ pcb do not have minimum values I believe, voltage is important too if ceramics are selected (4 to 10 times max voltage seen) to prevent distortion
BSPx AND BSNx CAPACITORS
The full H-bridge output stages use only NMOS transistors. Therefore, they require bootstrap capacitors for the
high side of each output to turn on correctly. A 220 nF ceramic capacitor of quality X5R or better, rated for at
least 16 V, must be connected from each output to its corresponding bootstrap input. (See the application circuit
diagram in Figure 27.) The bootstrap capacitors connected between the BSxx pins and corresponding output
function as a floating power supply for the high-side N-channel power MOSFET gate drive circuitry. During each
high-side switching cycle, the bootstrap capacitors hold the gate-to-source voltage high enough to keep the high-side MOSFET's turned on
BSPx AND BSNx CAPACITORS
The full H-bridge output stages use only NMOS transistors. Therefore, they require bootstrap capacitors for the
high side of each output to turn on correctly. A 220 nF ceramic capacitor of quality X5R or better, rated for at
least 16 V, must be connected from each output to its corresponding bootstrap input. (See the application circuit
diagram in Figure 27.) The bootstrap capacitors connected between the BSxx pins and corresponding output
function as a floating power supply for the high-side N-channel power MOSFET gate drive circuitry. During each
high-side switching cycle, the bootstrap capacitors hold the gate-to-source voltage high enough to keep the high-side MOSFET's turned on
tdk inductors are ~5amp I believe?? they do use 3.3uF input caps I noticed🙂 it is really cheap and I did try to order one LOL transfered money, website states:free shipping today. They start by adding $3 for shipping, then they mail you little later:unfortunately we have to add $16,80. Well twice adding costs after I bought while website advertises special today free shipping, decided I did not wanted to find out how many more times they will add costs till I finally receive them (if).
I don't have blue/black YJ😱 sorry think wushuliu mentioned it somewhere here, lower value used, but maybe just one production run? filter of redboard now is sold with the right size caps too...
Of course inductors and capacitors store energy, your point is?
When the inductor winding is parallel to the PCB, the magnetic field induced will be perpendicular to the PCB, therefore passing through the traces. Not sure how bad this will affect the current flowing through the traces.
Regards,