Studio Reference Amplifier

[alex mm]

Hi miro1360 ,please change value for R32 in your simulation with 470K ,it's the correct one .
Regards,Alex

 

[miro1360]

Hi alex, thank you. It is for both versions? In lifted ground is 470K and in normal is 470R in schematic.
And do you know which version is better to build?

 

[miro1360]

Now I know, lifted ground is technique to avoid hum.
10R between SGND and PGND must be for greater loads?

 

[meanman1964]

I'm building this PSU.
Can I use 0,33R emiter resistors instead of 0,22 and which replacements can be used for the BD240/242 combo?

 

[apexaudio]

I'm building this PSU.
Can I use 0,33R emiter resistors instead of 0,22 and which replacements can be used for the BD240/242 combo?

Yes 0,33R will be OK, there is no overcurrent limiter. MJE15030 and MJE15031 can be used instead BD241C and BD242C.

 

[meanman1964]

Apex,
Thanks,In some of this PSU schematic I see the use of two 12V zeners in some of 20V is this determined by how much rail voltage you have or want?

 

[apexaudio]

Apex,
Thanks,In some of this PSU schematic I see the use of two 12V zeners in some of 20V is this determined by how much rail voltage you have or want?

12v zeners is for rails about +/50v and 20v for rails about +/-80v

 

[44250]

getting closer to finish this one...

 

[apexaudio]

getting closer to finish this one...

Nice work.
Regards

 

[cuongdotvn]

Dear alex mm,
Which transistor need matched pair?
If i use transfomer 55-0-55 AC then min ampe need? Capicitor for PSU min uF, V need?
Thanks you very much!
Regards, cuongdotvn

 

[alex mm]

A40 CFA amplifier

First ,input two transistors must be paired . Minimum filter capacitors 20,000uF/63v needed per positiv and negativ rail .Voltage 55-0-55 for secondary transformer it's too big ,you need only 36-0-36 V ac or maximum 38-0-38Vac and 5 to 6 A. Use 25A rectifier bridges. .
Regards,Alex

 

[cuongdotvn]

SR200 amp ver 3.2

First ,input two transistors must be paired . Minimum filter capacitors 20,000uF/63v needed per positiv and negativ rail .Voltage 55-0-55 for secondary transformer it's too big ,you need only 36-0-36 V ac or maximum 38-0-38Vac and 5 to 6 A. Use 25A rectifier bridges. .
Regards,Alex

Thanks U.
Sorry, I forgot to say that I 'm using ver 3.2 SR200 circuit pcb .

And I want to reach a maximum capacity of 200W / 8ohm per channel.

 

[cuongdotvn]

First ,input two transistors must be paired . Minimum filter capacitors 20,000uF/63v needed per positiv and negativ rail .Voltage 55-0-55 for secondary transformer it's too big ,you need only 36-0-36 V ac or maximum 38-0-38Vac and 5 to 6 A. Use 25A rectifier bridges. .
Regards,Alex

Sorry, I forgot to say that currently I 'm using version v3.2 SR200

 

[cuongdotvn]

Dear alex mm and everyone,

I 'm using version v3.2 SR200.
How much power of Zener 15V? (0.5wat ?)
How much volt transformer is maximum for pcb if i use power supply non regulator?
And volt minimum of Capicitor:
- 100pF
- 470pF
- 22nF
if i use +-75vdc?

Thanks!!! Sorry, my english is very bad .
Regards, cuongdotvn

 

[still4given]

test

 

[cuongdotvn]

test

Dear, still4given
Srorry!!! I don't understand.
Regards, cuongdotvn

 

[cuongdotvn]

Update

An externally hosted image should be here but it was not working when we last tested it.

 

[meanman1964]

Can I use this PSU 10 for a Class A amp like the F5?

 

[apexaudio]

Can I use this PSU 10 for a Class A amp like the F5?

Yes with outputs on heatsink.

 

[meanman1964]

Thanks,Nice design by the way