Studio Reference Amplifier

[apexaudio]

I've made wires to 5200 and 1943 shorter(about 3cm), and VAC on negative rail is dissapear, but on positiv still 80vac
I trying to check it with osciloscope, but found nothing - line is straight as arrow(
Please help me!

Add 100pF base to colector on TIP31/32

 

[DenVeR777]

Add 100pF base to colector on TIP31/32

Thank you, Sir Mile!!!
I'll try it today.
And I thank you for sharing that great schematic with us!

 

[DenVeR777]

Sir Mile, thank you again for you advice!
My problem was in crappy multimetr)
When i reverse polarity of probes VAC is gone
Then i connect it to my temporary chip amp(TDA9273 with t-form NFB) and it works well. Audible improvment is MUCH less 50Hz noise in speakers compared with unreg psu with two 22000uF.
Next step is 4 channels SR200

 

[DenVeR777]

Construction in progress.

 

[DenVeR777]

Sir Mile, thank you, for that reg psu design!
I finish psu for 4 channels. It realy improve dynamics of bass region. Bass became more elastic and punchier.

 

[rohin]

please check

hi dear sir and everyone.please check this pcb so that i can make pcb.i want to make this op line amp because it has good quality sound.thanks.

 

[drgnanam]

hi rohin, i from chennai , if you are making this pcb please add 5 pcb for me too if possible

 

[rohin]

hi rohin, i from chennai , if you are making this pcb please add 5 pcb for me too if possible

hi,i will send you pcb file after test you can make it yourself or by local pcb manufacturer.

 

[cucuclock]

Hi,
I'm trying to use the same shunt regulator for a citation 12, I'm planning use 2 of them for channel, have you improved with your project? do you think is possible?
thank you
vito

Hi all.
I'm trying to make psu of sr50
but It's my first time making amp
and there's something I need your help

1. i see two 2SC5200 in schematic
but there's only one in pcb
is this pcb wrong? or is this ok?

2. and.. what is that 2k2 resistor tie to MPSA42//MPSA92 ?
just simple resistor or something else?
i don't know what to buy..

3. my hometown use 220v AC,
what transformer i should buy?
is this ? ( 220v AC primary // 2x40v AC secondary )

4. right side of trans, 4 diode making diamond
and the number 35A/400V
what is this?

 

[rohin]

sr800

hi apex sir is this working i want to make this amp. i will make pcb if you don't mind.please suggest me sir.thanks.

 

[kamranyousaf]

hi apex sir is this working i want to make this amp. i will make pcb if you don't mind.please suggest me sir.thanks.

Hi Rohin,

I have tested it on my local pcb(A different pcb modified) I think its error free and working fine...

 

[rohin]

Hi Rohin,

I have tested it on my local pcb(A different pcb modified) I think its error free and working fine...

thanks mr. kamranyousaf for quick reply.

 

[amir h]

hi

mr apex .what is the minimum voltage can be used for this SR200?

 

[thimios]

hi apex sir is this working i want to make this amp. i will make pcb if you don't mind.please suggest me sir.thanks.

Anybody who can share this pcb?

 

[apexaudio]

hi

mr apex .what is the minimum voltage can be used for this SR200?

+/-35V

 

[rohin]

apex sr800

i want to make and test if it works then we have another great amplifier.thanks

 

[sownel]

hi sir rohin pls send sr800 PCB layout and offset ,bios ,rail voltage

 

[DenVeR777]

Hello all!
I finnaly finish 4 chanels of sr100.
It sound well, much better bass and more detailed highs compared with tda's.
On oscilogram present overshot, like I saw in Thimos build. Caps and resistor slightly improve it, but not completely.
Do I need zobel on output?
Here some ampporn:

 

[AndrewT]

An unusual shape of sqwave.
What frequency?
Is that bass gain creating the upward slope?
Is there some overshoot?
What load have you attached?

I would (as a general guide) always fit an output Zobel and an L||R, i.e. the full Thiele Network.

 

[apexaudio]

Hello all!
I finnaly finish 4 chanels of sr100.
It sound well, much better bass and more detailed highs compared with tda's.
On oscilogram present overshot, like I saw in Thimos build. Caps and resistor slightly improve it, but not completely.
Do I need zobel on output?

Nice work, zobel is on speaker terminal... post #43,
Regards