第一次膽粗粗試下整單端膽後 EL34

ADA

jastudio 發表於 2013-10-24 10:58
我TB買的，好難寄返比佢

留意 ... 如果用膽整流, ac 組最少要 280-0-280 的.
因為膽整流後不是 1.4 倍的.

ADA

jastudio 發表於 2013-10-24 11:00
梯過內地d forum 有時講到半波易d有 hum， 但係又吾講點解

講真 ... 我見幾乎所有 diyer 都砌全波的,  so far 無人特登砌半波.

jastudio

ADA 發表於 2013-10-24 11:00
留意 ... 如果用膽整流, ac 組最少要 380-0-380 的.
因為膽整流後不是 1.4 倍的.
...

oh。。。。那麼是多少倍？ 好像聽說choke 放系前面同 cap 放前面都有唔同電壓？

ADA

jastudio 發表於 2013-10-24 11:11
oh。。。。那麼是多少倍？ 好像聽說choke 放系前面同 cap 放前面都有唔同電壓？ ...

其實輸出 peak 係 1.4倍, 但每支膽都有 voltage drop 的 ...視乎整流膽, 所以粗略計就係 1.1~1.2倍.

jastudio

ADA 發表於 2013-10-24 11:04
講真 ... 我見幾乎所有 diyer 都砌全波的,  so far 無人特登砌半波.

有無办法可以一粒5Z3 代替到D整流子
(Post76 Android 手機版送出)

jastudio

jastudio 發表於 2013-10-24 11:25
有無办法可以一粒5Z3 代替到D整流子
(Post76 Android 手機版送出)

好似吾得。。。。
(Post76 Android 手機版送出)

billymud

{轉載}
Tubes only conduct current when the signal is in the positive half of the cycle.  
So with a half wave rectifier, the tube passes half the sine wave, then stops
conducting altogether during the negative half of the wave, then conducts again
when the signal returns to positive.  So you have complete gaps in conduction
during half of the sine wave cycle; not very efficient.  
A full wave rectifier is two half wave rectifiers in one tube.  But the two
halves are wired on opposite sides of the  center-tapped transformer; when
one half goes negative (and cuts off), the other goes positive (and conducts).  
So when you sum up the two halves after rectification, you have a continuous,
bouncy positive wave that never has any gaps and never goes negative.  Then
the signal is filtered through caps and/or inductors to make it flatter and
less bouncy.  Does this help?

jastudio

billymud 發表於 2013-10-24 11:29
{轉載}
Tubes only conduct current when the signal is in the positive half of the cycle.  
So with a  ...

yes. just realise that
(Post76 Android 手機版送出)

billymud

jastudio 發表於 2013-10-24 11:35
yes. just realise that
(Post76 Android 手機版送出)

通街全波整流膽，
你想買 half-wave整流膽都難。
好彩全波可作半波。

jastudio

billymud 發表於 2013-10-24 12:10
通街全波整流膽，
你想買 half-wave整流膽都難。
好彩全波可作半波。 ...