http://www.tripath.com/downloads/TA2024.pdf
Sonic Impact T-Amp 是我個人非常喜歡的一個小玩具.
我認為 Tripath 的所謂 Class-T chip 把音樂品質帶入了之前沒有想過的價位.
這裡我把一些蒐集的資料給大家看看, 也歡迎提出見解.
我是一點都不懂, 不過慢慢地在學, 錯誤荒謬, 還請各位指教.
http://www.diyaudio.com/forums/showthre ... genumber=1
東西太多了, 資料豐富.
http://www4.head-fi.org/forums/showthre ... nic+impact
sluggo 寫:Some of you are interested in modifying the Sonic Impact "T-amp" for better performance. I don't have an amp to play with, but I have a lot of experience with the Tripath parts used in them. Some suggestions and what-not:
1. Do not modify anything around the output pins of the amplifier chip. This is a switching amplifier that operates at around 700 kHz and the placement of the components in the output circuit is critical. This is the single most important piece of advice I can offer. Get this wrong and you can blow up your amp and any speakers connected to it.
2. You CAN experiment with the main output inductor (as this is the place where most OEM's will try to save some money), but you should NOT try different values. Stay with the recommended value (10uH), but maybe experiment with a core with a larger saturation current. (Based on the photos, the cores used in T-Amp look to be pretty good.)
3. The 180uF supply cap should probably be beefed up a bit. I would also bypass it close to the chip with a small value high-quality film cap. Those of you going with mondo linear power supplies can ignore the beefing up, but adding a small film cap is still a good idea. A regulated supply is not required, but you don't want something saggy.
4. Replace the 2.2uF input electrolytics with a similar value film cap with at least a 12V rating. Electrolytics (even good ones) are usually not the best sounding cap in a signal path. Avoid using a smaller value part, as that will roll off the bass.
5. The part has built-in thermal protection and you will probably be well into audible clipping before the thermal protection kicks in. None the less, if I were a serious modder I would work out a way to attach a big chunk of metal to the solder blobs on this board. The part is designed to operate with die temperatures approaching 150 C, but a little thermal mass never hurts, even if only to allow the part to run comfortably when it's hot in the listening room. Old microprocessor heatsinks (passive) are great for this.
6. There's a general-purpose FAULT pin that's handy for problem situations. I don't know if it's used in the T-amp design, but if not it's a nice addition. Lights up for undervoltage on the power supply or charge pump, thermal warning, and overcurrent (shorted output). Pin 19, it can drive an LED directly through a 5k resistor.
7. Be careful about what you use for a power supply. The part can be damaged permanently by a supply that wanders much above 17 V. If your supply spikes when turned on, use a relay with a time delay to protect the amp chip or use a different supply.
8. Remember that the outputs of the amps are run in bridged mode, so no connecting the output "grounds" together. These are not grounded outputs, and tying them together will damage the amp.
9. The amp is pretty efficient and will run a long time on a standard 12-13.2V gel cell if you need to go mobile.
Good luck, and have fun playing around with this amp.
[補充] 簡略翻譯
我稍微翻譯了一下這篇 post, 但是因為不是電子背景, 可能不是太能讀.
有什麼不通好笑的部分, 還請指教, 我好改一下.
謝謝.
http://www4.head-fi.org/forums/showthre ... nic+impact
Some of you are interested in modifying the Sonic Impact "T-amp" for better performance. I don't have an amp to play with, but I have a lot of experience with the Tripath parts used in them. Some suggestions and what-not:
有一些人會想要改善 Sonic Impact T-amp 的性能. 雖然我手上並沒有這台擴大機, 但是我對這台機器上使用的 Tripath 晶片零件很有經驗. 這裡是我的一些建議和警告.
1. Do not modify anything around the output pins of the amplifier chip. This is a switching amplifier that operates at around 700 kHz and the placement of the components in the output circuit is critical. This is the single most important piece of advice I can offer. Get this wrong and you can blow up your amp and any speakers connected to it.
1. 千萬不要更動擴大機晶片 output 的部分. 這是一個運作在 700KHz 的數位擴大機, 輸出部分的線路的擺設佈線是非常重要的. 這是最重要的, 弄錯了, 你會把你的擴大機和喇叭一起燒掉.
2. You CAN experiment with the main output inductor (as this is the place where most OEM's will try to save some money), but you should NOT try different values. Stay with the recommended value (10uH), but maybe experiment with a core with a larger saturation current. (Based on the photos, the cores used in T-Amp look to be pretty good.)
可以嘗試更換同數值, 但是更大的飽和電流(saturation current) 的主輸出電感(main output inductor), 這部分是大部分 OEM 廠商會想辦法省錢的地方. 從照片上看來, T-amp 的還算不錯.
3. The 180uF supply cap should probably be beefed up a bit. I would also bypass it close to the chip with a small value high-quality film cap. Those of you going with mondo linear power supplies can ignore the beefing up, but adding a small film cap is still a good idea. A regulated supply is not required, but you don't want something saggy.
180uF 的那個電容可以考慮加強一點, 我會想要再併一個小數值高品質的 film cap. 如果要用穩壓電源可以不用管 180uF 的電容, 但是加一個小電容也不錯. 電源方面不要用太差的.
4. Replace the 2.2uF input electrolytics with a similar value film cap with at least a 12V rating. Electrolytics (even good ones) are usually not the best sounding cap in a signal path. Avoid using a smaller value part, as that will roll off the bass.
把 2.2uF 的電解電容換成相同數值, 至少耐壓 12V 的 film 電容. 電解電容通常不太好聽.
不要用更小數值的電容, 低音會受影響.
5. The part has built-in thermal protection and you will probably be well into audible clipping before the thermal protection kicks in. None the less, if I were a serious modder I would work out a way to attach a big chunk of metal to the solder blobs on this board. The part is designed to operate with die temperatures approaching 150 C, but a little thermal mass never hurts, even if only to allow the part to run comfortably when it's hot in the listening room. Old microprocessor heatsinks (passive) are great for this.
晶片零件有內建溫控裝置.
實際使用上在溫控保護作用前, 你應該會先聽到嚴重的失真和破碎的聲音. 雖然晶片零件耐熱 150 度C, 不過還是建議使用某種散熱方式(作者建議用銲錫). 舊的 CPU 散熱器就很好用.
6. There's a general-purpose FAULT pin that's handy for problem situations. I don't know if it's used in the T-amp design, but if not it's a nice addition. Lights up for undervoltage on the power supply or charge pump, thermal warning, and overcurrent (shorted output). Pin 19, it can drive an LED directly through a 5k resistor.
晶片有一個偵錯的功能 (pin 19).
不確定 Sonic Impact 有沒有設計進去, 但是有時很方便. 可以知道電壓不足, 充電, 過溫, 短路的狀況.
使用上 Pin 19 用一個 5K 的電阻連接一個 LED.
7. Be careful about what you use for a power supply. The part can be damaged permanently by a supply that wanders much above 17 V. If your supply spikes when turned on, use a relay with a time delay to protect the amp chip or use a different supply.
電源不可超過 17V. 如果開機時會有突波(spike), 加一個延遲線路來保護晶片. 或是換一個電源.
8. Remember that the outputs of the amps are run in bridged mode, so no connecting the output "grounds" together. These are not grounded outputs, and tying them together will damage the amp.
擴大機是以經是使用並聯輸出, 所以輸出的 ”地” 不可以連在一起.
9. The amp is pretty efficient and will run a long time on a standard 12-13.2V gel cell if you need to go mobile.
可以使用 12~13.2V 的攜帶式電池.
Good luck, and have fun playing around with this amp.
