Zeny based on Nelson Pass cascode design

[jh6you]

Ok . . . recharging my energy at home, I wanted to have a look at square wave forms from my son's Zeny.

I prepared myself as shown . . .

 

[jh6you]

At 200kHz with the 40ohm headphone connected

 

[jh6you]

At 100kHz with 40ohm headphone connected

 

[jh6you]

At 20kHz with no load

 

[jh6you]

At 10kHz with no load

 

[jh6you]

At 1kHz with no load

 

[jh6you]

Q.

Looking at the wave forms above, can I say that this amp has the upper critical frequency minimum 100kHz?

Thanks

 

[Zen Mod]

Q.

Looking at the wave forms above, can I say that this amp has the upper critical frequency minimum 100kHz?

Thanks

in any case-looks good enough

 

[jh6you]

Thanks for the reply, choky

Yeah . . . Good enough is the best for me.
Often I forget the value of . . . "good enough" . . .

Regards

 

[Zen Mod]

Thanks for the reply, choky

Yeah . . . Good enough is the best for me.
Often I forget the value of . . . "good enough" . . .

Regards

yup

often forgotten- good engineer knows what is

 

[steenoe]

Hi JH, I got your email today and sent an answer back to you. If you did not receive the answer, It's definately getting blocked somewhere. In that case, I suggest you send me a new email including your adress so I can send the Lovoltechs to you. I will just include a letter with payment instructions together with the J-fets. Seems like snailmail is the safe and reliable way after all I will take care of the gift also, dont worry

Steen

 

[jh6you]

Thank you very much, Steen.

I am afraid that our filter against spam seems to be too serious to receive your mail. I will follow your instruction.

Best Regards

 

[steenoe]

Thank you very much, Steen.

You are welcome, JH I would never let a fellow DIY'er behind
That spamfilter of yours is way too touchy I sent you emails from 3 different accounts I wonder how much you miss
Well, at least we can talk on this forum I even asked the webmaster at DIYaudio to get in touch with you with no result. (Just thought I would throw that in , I dont know if somebody fell asleep or it was filtered out too) Well enough of that stuff, I have had my fun with it Just let me have your adress and the Lovoltech's are out of here

Steen

 

[steenoe]

Hi JH. The Lovoltech's are sent.

Steen

 

[jh6you]

I will soon toss my balls to you, too.

Regards

 

[santi]

My Zeny was finished.

Hi JH,
Thank a lot. I just finished my Zeny.
I love her sound very much.

The only one problem I found is her output level was too low.
Could you suggest any idea?

Santi

 

[jh6you]

What is your headphone? Impedence and sound pressure level (dB)?

Regards

 

[santi]

It is Phillips SBC HS500.
Impedance = 24 Ohm
Sound pressure level = 106 db

I used R 221 Ohm in the place of "0-750 depend on...".
The sound level was lower than connect headphone directly to the source (soundcard).

 

[jh6you]

Using a copper wire, short the 221R to 0.
If the sound is too loud, try to find a proper value between 0 and 221R.

If you have any further question, I will have pleasure in answering it.

Enjoy!

 

[santi]

Thanks JH,
My Zeny sang louder with 0 Ohm.

Santi