Heatsink
Some guys here had some burned modules so I inspected the heat sink on my modules that I received last week.
One module had loose screws so the heat sink wasn't fixed anymore. This was probably due to the shipping.
So I added lock washers and tightened the screws.
But you have to watch out to not tighten the screws too much because then the PCB will bend and the ICs won't make anymore contact with the heat sink.
Then I noticed that there are two not used holes in the middle of the PCB, but no holes in the heat sink.
If I could put extra screws in those holes I would be able to tighten the heat sink much better without bending the PCB.
So I tapped two extra holes in the heat sink, added some new grease and tightened four screws with lock washers.
Now the heat sink is installed perfectly !
PCB is not bended and there's a much better contact between heatsink and ICs.
Some guys here had some burned modules so I inspected the heat sink on my modules that I received last week.
One module had loose screws so the heat sink wasn't fixed anymore. This was probably due to the shipping.
So I added lock washers and tightened the screws.
But you have to watch out to not tighten the screws too much because then the PCB will bend and the ICs won't make anymore contact with the heat sink.
Then I noticed that there are two not used holes in the middle of the PCB, but no holes in the heat sink.
If I could put extra screws in those holes I would be able to tighten the heat sink much better without bending the PCB.
So I tapped two extra holes in the heat sink, added some new grease and tightened four screws with lock washers.
Now the heat sink is installed perfectly !
PCB is not bended and there's a much better contact between heatsink and ICs.
Sta505
Hifimediy told me yesterday that he has already changed from tp2050 to sta505. The controller, which is supposedly the most important for the sound quality, is still the tc2000. From what I understand the sta505 and tp2050 are very similar, maybe the sta505 is a little better. Comments?
Most of the boards shipped out should have the sta505 already, but I don't know exactly which ones, or how many that has got the tp2050.
I will update the ebay auction shortly to reflect this.
Hifimediy told me yesterday that he has already changed from tp2050 to sta505. The controller, which is supposedly the most important for the sound quality, is still the tc2000. From what I understand the sta505 and tp2050 are very similar, maybe the sta505 is a little better. Comments?
Most of the boards shipped out should have the sta505 already, but I don't know exactly which ones, or how many that has got the tp2050.
I will update the ebay auction shortly to reflect this.
You can bypass the relays like this. However, this feature is not tested, and you would get the "pop" sound on turn on/off which the relays are supposed to remove. I would recommend doubling the voltage to 24V instead.
An externally hosted image should be here but it was not working when we last tested it.
According to the datasheets, the STA505 is capable of 50W @ 8 ohm with 10% THD while the TP2050 is capable of 50W @ 8 ohm with 3% THD+N.
(notice that the STA505 refers to THD while the TP2050 to THD+N. I assume that STA505 wants the same to indicate the THD+N when speaking about THD).
STA505: http://www.datasheetcatalog.org/datasheet/stmicroelectronics/8166.pdf
TP2050: TP2050 pdf, TP2050 description, TP2050 datasheets, TP2050 view ::: ALLDATASHEET :::
So che TP2050 should sound better (more 'audiophile').
Also I noticed that the STA505 max voltage is 40V vs. TP2050 36V.
So the STA505 *could* produce less heat at the same voltage of 30V and not burns till 34V.
Now I add my suggestion for the next board revision:
Even though toroids are essentially self-shielding, turning the adjacent parts 90 degrees reduces the magnetic coupling and thus crosstalk.
About the relays I've to ask you, is there a timed circuit or the relays turn on immediately when the input voltage is applied?
In such case I assume that the pop speaker prevenction works only when you turn off the amplifier and not during turn on.
What do you think about?
Thanks, bye!!
According to the datasheets, the STA505 is capable of 50W @ 8 ohm with 10% THD while the TP2050 is capable of 50W @ 8 ohm with 3% THD+N.
(notice that the STA505 refers to THD while the TP2050 to THD+N. I assume that STA505 wants the same to indicate the THD+N when speaking about THD).
STA505: http://www.datasheetcatalog.org/datasheet/stmicroelectronics/8166.pdf
TP2050: TP2050 pdf, TP2050 description, TP2050 datasheets, TP2050 view ::: ALLDATASHEET :::
So che TP2050 should sound better (more 'audiophile').
Also I noticed that the STA505 max voltage is 40V vs. TP2050 36V.
So the STA505 *could* produce less heat at the same voltage of 30V and not burns till 34V.
Now I add my suggestion for the next board revision:
Even though toroids are essentially self-shielding, turning the adjacent parts 90 degrees reduces the magnetic coupling and thus crosstalk.
About the relays I've to ask you, is there a timed circuit or the relays turn on immediately when the input voltage is applied?
In such case I assume that the pop speaker prevenction works only when you turn off the amplifier and not during turn on.
What do you think about?
Thanks, bye!!
Hi.
3% THD+N of TP2050 is tested with TC2000, which is more important for the performance of the system. You may check the datasheet to find that STA505 is same as TP2050, including voltage range. Because of TP2050 is almost out of stock on the market now, STA505 is the best compatible part in my opinion.
And 90degree placement is good idea when the toroids is too close to each other. but it's ok now in our boards.
About relays, it has a time(about 1~2 secs) for relays turn on after power on. And we also have a added power supervisor IC to prevent clik-noise on board. Thanks.
Are the Tripath chips still being manufactured? I know the IP was bought by another company, but it's never been clear (to me, anyway) where all these chips come from.
Another thing necesary for run at low voltages:
Bypass the relay and also lower the value of R27 which is near the LM7805. Bypass R27 for 12V
Hifimediy, have you got some news about the coils issue?
Did you do some test with different coils to determine if there are audible differences?
Thanks, bye!!
Another question for hifimediy: is the output related to the input non-inverting?
(you can value the question here: 6moons audio reviews: Winsome Labs Mouse)
Thanks, bye!
PS: I'm very interested in your board so I'm asking every detail to you!
(you can value the question here: 6moons audio reviews: Winsome Labs Mouse)
Thanks, bye!
PS: I'm very interested in your board so I'm asking every detail to you!
Nick122147,
Thanks for all the info. As the application is for a portable mono-channel PA, can the two channels be "used in parallel" for more power? I guess the question is "how to turn the stereo configuration into a mono configuration with more power"
In the review the maker writes:
"In fact, the TP2050 is really a Tripath-branded STI Microsystems STA-505"
Does that mean they are identical?
About the non-inverting: I myself think that is not possible to hear. If you move your ears 0,01 mm closer to the speakers you will hear the non-inverted signal. (just a guess
In the review the maker writes:
"In fact, the TP2050 is really a Tripath-branded STI Microsystems STA-505"
Does that mean they are identical?
About the non-inverting: I myself think that is not possible to hear. If you move your ears 0,01 mm closer to the speakers you will hear the non-inverted signal. (just a guess
Nope , You have to mount the driver inside out, To hear the non-inverted sound, LOL
Many chips have stock on the market we can still buy. And some one like me will have own stock.
hi, the coils we used one v2.0 now is type -2, which is suggested on the application note of Tripath. other coils may works but not good enough, some may lead to high temperature or even burn.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.