請教OPA627, OPA637 起震問題

各位Ar Sir.

我聽聞OPA627, OPA637正負電壓唔夠15v會起震, 唔好聲

但我度過部CD機, 正負10v 但換左又好好聲, WHY!?

另外我部機有4個VR做調正負電壓, 是否要調至15v? 效果會更佳? :roll:

[quote:f336d07699="dynamicdog"]各位Ar Sir.

我聽聞OPA627, OPA637正負電壓唔夠15v會起震, 唔好聲

但我度過部CD機, 正負10v 但換左又好好聲, WHY!?

另外我部機有4個VR做調正負電壓, 是否要調至15v? 效果會更佳? :roll:[/quote]


627及637工作電壓是由正負4.5V至正負18V。

Modi Sir,

咁即是沒有問題!?

我無聽錯, 真的好聲左, 我耳仔無問題?

另外有想問, 如果我將電壓調高D, 會唔會有更好動態?

[quote:4a8e128f8c="modi"][quote:4a8e128f8c="dynamicdog"]各位Ar Sir.

我聽聞OPA627, OPA637正負電壓唔夠15v會起震, 唔好聲

但我度過部CD機, 正負10v 但換左又好好聲, WHY!?

另外我部機有4個VR做調正負電壓, 是否要調至15v? 效果會更佳? :roll:[/quote]


627及637工作電壓是由正負4.5V至正負18V。[/quote]

你張相是Stephen大哥至愛.

不要調高，會影響其它的參數。

多謝Modi Sir 指教!



[quote:8b35203ad4="modi"]不要調高，會影響其它的參數。[/quote]

你部機看D料.

1. Check the original op-amp circuit about the GAIN.

2. If the Gain is < 5, cannot use OPA637.

Just like MHZ66, if not observe the CRO, you don't know the output waveform is clip (for some model, it is a human error)

If you understanding the circuit operation clearly, you may not need to mod all compoents will have great result.

See the datasheet for reference.

thank you KK sir.

我諗都係唔好搞咁多野...買隻好 D既DAC算吧啦...

唉!

3萬幾蚊部CD機...完全唔聽得

要加部3萬幾蚊DAC.......晕@@

加加埋埋$70k埋單...早知買部$70k Wadia

又可能$70k Waida 又唔聽得...

都係要加部$70k DAC...

....................

不歸路

....................

早知買部幾百蚊DVD機有聲出就算...得閒拎出黎摩摩佢...玩死唔肉痛

仲過癮

Modification is not too difficult.

See the attached file