Studio Reference Amplifier

[DenVeR777]

Hello, Andrew.
Frequency is 2 kHz.
Sine is good on all range.
Load is 6.7ohm with 100nF in parallel.

 

[DenVeR777]

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

Hello, Sir. Mile. I saw that schematic and my question is in it nesesserity. Is Zobel required?

 

[AndrewT]

100nF can be a severe test for ringing and overshoot.
Add your Zobel at the amplifier output.
Place the L||R after that .
You can add an optional Zobel across the speaker terminals for extra RF attenuation. But this should not be the sole Zobel and certainly not without the L||R in the output route.

 

[DenVeR777]

Thank you, Andrew! I' ll try it tomorrow and post results.
L is about 1-3uH?

 

[AndrewT]

I have seen as low as 0.5uH to as high as 10uH
<=1uH seems to be common.

 

[DenVeR777]

OK)

 

[sownel]

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

Hi sir rohin i make this pcb apex sr 800.any equalant for ntc 150k pls enybudy reply thank you

 

[rohin]

apex sr 800

apex sr 800 but not tested. i will make this amp after few days. delay because of festival season.it may be ok but any fault found please tell me.thanks.

 

[alex mm]

SR800 amplifier it's a commercial amplifier not for diy purpose schematic was not posted ......

 

[thimios]

SR800 amplifier it's a commercial amplifier not for diy purpose schematic was not posted ......

Schematic not posted ,but you know(and Mile of course)....is this ok to built as it?

 

[rohin]

Schematic not posted ,but you know(and Mile of course)....is this ok to built as it?

i did something wrong? if anyone want to make that amp then what is wrong? we don't do this for profit ever.please forgive me if i did wrong.thanks.

 

[thimios]

I don't believe that is something wrong as this pcb posted here in this thread.
Just the schematic isn't available.
If Mile want to see this as DIY can answer the question.
Is this pcb on the right way?
Can we try this without the risk of a fault?

 

[apexaudio]

I can't help you with schematic, but you can clone SR800.
Regards

 

[rohin]

I can't help you with schematic, but you can clone SR800.
Regards

positive signal from apex sir.thanks.

 

[kamranyousaf]

My Preamp

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.

Thanks Sir Apex for sharing beautiful circuit logic for preamp.

 

[rohin]

apex sr 800 sch

apex sr 800 sch only for understanding and improvements not for raising questions to designer.thanks.

 

[apexaudio]

apex sr 800 sch only for understanding and improvements not for raising questions to designer.thanks.

Nice work,
Regards

 

[rohin]

apex sr 800 sch only for understanding and improvements not for raising questions to designer.thanks.

one or may be two mistake in sch.connecting z27 ziner diode not connect with + rail it only connect from outputs.if found any mistake please tell me.thanks.

 

[miro1360]

I found here on forum two versions Apex A40, one is something with "lifted ground" and other is without. Which one is better to build?

 

[miro1360]

here are LtSpice files for simulation, both A40 versions