Babo Tries New Voltage Regulator for F5

[Babowana]

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Spring has come . . .
Leaves are too dry . . .
Light mountain fires . . .


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I will try a new voltage regulator for my F5 amp. Why . . . ?

1. Wanna cut off few Vdc inbetween the 25Vac secondary and the 24Vdc rail I want.
2. Wanna have a very stiff voltage source.
3. Wanna have a current limiter--max. load current of 10A.
4. Wanna have a short circuit current of 2A.
5. Wanna remove the current limiter included in F5 amp circuit.
6. Wanna try a thing the other diyers havn't tried yet.
7. Will have a bleeder.
8. Will have a soft starter.
9. Most importantly wanna have another diy fun!
   [/List=1]
   
   I dun know whether I'm walking through the right direction towards a safe escape. I myself can't see a big picture of the forest, some parts of which are on fire.
   
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[Babowana]

Have made very preliminary drawing on PC board, to check size and space of the the board required for components arrangement. It seems that the board could be reduced somewhat smaller . . . but . . . but . . . the chassis has plenty inner space . . . keeponrunning!


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[audiorob]

I will try a new voltage regulator for my F5 amp. Why . . . ?

1. Wanna cut off few Vdc inbetween the 25Vac secondary and the 24Vdc rail I want.
2. Wanna have a very stiff voltage source.
3. Wanna have a current limiter--max. load current of 10A.
4. Wanna have a short circuit current of 2A.
5. Wanna remove the current limiter included in F5 amp circuit.
6. Wanna try a thing the other diyers havn't tried yet.
7. Will have a bleeder.
8. Will have a soft starter.
9. Most importantly wanna have another diy fun!
   [/List=1]
   
   I dun know whether I'm walking through the right direction towards a safe escape. I myself can't see a big picture of the forest, some parts of which are on fire.
   
   ><

1. 
   
   Rock on brother Babo!
   
   I believe the 317/337 with pass transistor based regulator that I built really made
   a positive difference in the sound character of the amp. I believe it gave more
   definition throughout the sound spectrum. I believe this made for a more vivid
   sound stage.
   
   Maybe these things actually derive from being able to set the voltage on the
   rails more accurately (to balance the pos and neg sides). Maybe they are due
   to extra power supply filtering that I did at the same time. Maybe it is due to
   better handling of power problems in my city. I don't know...
   
   I will be interested in reading how your project progresses, and if you believe the
   end product makes any audible difference. Good luck!
   
   Robert

 

[Babowana]

...Good luck!

Thanks, Robert. I'm encouraged . . . moving one step forward.


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[fab]

Hi Babo

The way you used raw PCB to incorporate layout of traces using a "Dremel" type of drill gave me some interest to try it for some projects since I do not have etching pcb kit and all the chemical stuff required...

Regulating the F5 power supply should surely provide some interesting improvements...

keep us posted on the "before and after" sound comparison too.

 

[Babowana]

keep us posted on the "before and after" sound comparison too.

Hi,

Will try, but the progress is slow for certain reason . . . Be patient, pls . . .


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[Babowana]

The populated board is ready to go into the chassis . . .


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[fab]

The populated board is ready to go into the chassis . . .
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Hi,

Nice job

For the power mosfets will they be attached to the main amp heatsinks or use separate dedicated smaller heatsinks? If on the main heatsink, how will you attach the one in the middle of the pcb ?

Additionally, how do you control the depth of the drill in the pcb to remove the copper to do the layout? unless I have totally misunderstood your technique...

Thanks

 

[Babowana]

If on the main heatsink, how will you attach the one in the middle of the pcb ?

Additionally, how do you control the depth of the drill in the pcb to remove the copper to do the layout?

Yeah . . . I attach the mosfets on the main heatsinks and use lead wires to the PCB. The lead wires have been ok for me. If I consider that the wire length is too long, I solder the gate resistor (220R) directly to the gate pin, and then I send the lead wire to the PCB.

I control the depth of the drill, using my three-finger force (like pen holding). That's all.


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[Babowana]

New F5 excluding the current limiter is underconstruction too,
along with the new regulated power supply. Now, F5 does almost look like Babo Zen.

The board size is 200mm x 60mm.

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[Luke]

thats quite a skill babo, nice boards. I find varo board easier, but not as nice as yours.

 

[Babowana]

Met a problem in posting with the attched file . . .
What's wrong . . . ?

 

[Babowana]

Let me try another post with one more attached file . . .
It seems working now . . .


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[Babowana]

Onboard ship . . . Running trial finished . . . Working


>><<

 

[Babowana]

Had a problem in the right channel of the new amp . . .
But, it successfully fixed . . .
and bias adjustment for the both channels finished . . .


>><<

 

[fab]

...
I control the depth of the drill, using my three-finger force (like pen holding). That's all.
><

You are an artist

Had a problem in the right channel of the new amp . . .
But, it successfully fixed . . .
and bias adjustment for the both channels finished . . .
>><<

Nice job. Now stop teasing us and tell us how it sounds
...

 

[Babowana]

Now stop teasing us and tell us how it sounds

Give me a bit more time. I have just finished system set-up:

Babo voltage-feedback shunt reg. >> excellent B1 buffer >>
Babo voltage-feedback serires reg. >> great F5 power amp >>
four ATC SCM7 spakers

Two speakers (paralleled) per channel . . . total four . . .

Papa might laugh . . . I have chosen the bias for F5 at 0.85A


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[Babowana]

My second son (26) has never shown his interest in my diy audio. I have sometime wanted to borrow his ears for sound test, but in vain. He has always said: "I don't know about the sound quality. I just listen to my favorite music." He has been like that . . .

We were on the lunch table yesterday. ???. . . He was quietly eating, and slowly opened his mouth: "It's quiet and the sound is very good!" Ehh . . . ? It was a surprising comment from him . . . I was making inner smile . . .

I believed he meant that S/N ratio was high and the sound was great. Yes, it was. Sure that it was supported by the power supply regulation.

Nigel Kennedy, KAFKA, II. I BELIEVE IN GOD

The big stage is filled in with energetic Drum and Bass . . . The large hall is filled in with Choir . . . There is rhythm guitar . . . And, electric and acoustic violins floating above them . . . Mmm . . . as if Jimi Hendrix were playing the violins . . .

I highly recommend you to join me, build and enjoy

><

 

[fab]

My second son (26) has never shown his interest in my diy audio. I have sometime wanted to borrow his ears for sound test, but in vain. He has always said: "I don't know about the sound quality. I just listen to my favorite music." He has been like that . . .

We were on the lunch table yesterday. ???. . . He was quietly eating, and slowly opened his mouth: "It's quiet and the sound is very good!" Ehh . . . ? It was a surprising comment from him . . . I was making inner smile . . .

I believed he meant that S/N ratio was high and the sound was great. Yes, it was. Sure that it was supported by the power supply regulation.

Nigel Kennedy, KAFKA, II. I BELIEVE IN GOD

The big stage is filled in with energetic Drum and Bass . . . The large hall is filled in with Choir . . . There is rhythm guitar . . . And, electric and acoustic violins floating above them . . . Mmm . . . as if Jimi Hendrix were playing the violins . . .

I highly recommend you to join me, build and enjoy
><

Hi

Well ...It sounds inviting !.

Can you provide a comparison with the F5 w/o the voltage regulator...
Did you use the same capacitor bank value as the one suggested in Pass F5 documentation?

Papa might laugh . . . I have chosen the bias for F5 at 0.85A

Why only 0.85A with such big heatsinks....

 

[Babowana]

Did you use the same capacitor bank value as the one suggested in Pass F5 documentation?

Why only 0.85A with such big heatsinks....

No. Look at my old PSU having total 198,000uF. I compared the sound new one with this old one. I prefer new one. And, for your info, I have never tried the one suggested in Papa's documentation.

Why only 0.85A? Ehh . . . it could increase distortion values. But, my ears do not sense the increased distortion . . .

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