my UcD180 Amp

小弟的 UcD180 後級，使用由 DZ 買回來的火牛及整流板 80,000 uF。每聲道各一組！

My3C.net 現在的服務 okay 嗎? 以前試過同佢買東西, 送錯了別人的東西來, send email 俾佢, 佢叫人來收回, 但我自己訂的東西就無送來 .... sent 了幾個 email 倖佢哋都唔答 .... 結果再過成個星期先送回我要的東西 ...... 以後都怕怕.

幾個月前從其他師兄口中先知都, 原來佢哋試過話攪"團購" .... 收晒人錢之後完全沒有下文 .....

我之前買過好幾次都okay，朋友的團購都未出過問題(但要耐性)。但最近一年未買過野，服務有否變差呢？

Panson,

Some questions to your UCD.

1. What is your MAX power of the transformer?
2. What is your total value of Capacitor use?


Some comment to your UCD.
1. Try to increase the heatsink.(size)

2. There are no protection circuit found in your machine. If the temperature is rising, the UCD mosfet is very easy to output a DC voltage to KILL your speaker.

3. You better to do :
a) adding a loudspeaker protector,
b) Increase the size of heatsink
c) Using the DC monitor circuit at output, when DC occur (usually over 3V, the power supply latch up and user need to FULLY power off device.) It is build into the rectifier board. Please contact us, we have that board.

4. I cannot found a power on soft mute and power off soft mute circuit inside your board. (we have that board which is combine into the main rectifier)

5. Reduce the total length of your speaker output cable.

I made and teaching over 140 set of UCD180,400 and 700.
KK.Ho

KK,

Thanks for your suggestions!

Speaker protector (delay + DC) are employed. The picture was taken before the protector installed. The rails is +/- 38V with 80,000 uF caps per channel. I don't need full power from the modules.

Please read this presentation, very useful


http://www.hypex.nl/docs/AES124_Masterclass_Putzeys.pdf

Thanks a lot! Very good information.

Hi KK,

May I know more details about this

2. There are no protection circuit found in your machine. If the temperature is rising, the UCD mosfet is very easy to output a DC voltage to KILL your speaker.

Does it suppose to be warm only on this AMP ? Why when temperature high, UCD mosfet output DC ?

Thanks.

My Ucd108 has no speaker protector circuit either.
KK sir, can you post some  pictures of the speaker protector and main rectifier board?

Thanks,

Bong,

1. You can use typical speaker protector
2. Or using our rectifier board + protector board.

Typical speaker will cut off the speaker output when the output terminal have DC voltage. Typ > 2V.

Our board is cutting the power supply (LATCH), you need to remove the AC source to recover.

THX