Studio Reference Amplifier

[Helixir]

Yo!)
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Waiting "craft" PCB of SR300 amp... and now i have two question:
1 - Any power supply with soft start PCB in lay format (for print PCB) for this amp ?
2 - Any protection PCB in lay format for *again* this amp?)

*cheers.

 

[sasek]

Hi apex.
I already build SR200 amplifier. Sound very good.
Any suggestion for other amp that more power and high quality sound?

 

[Gurpreet Turna]

Nice work, DC offset is very good, use PSU100 there is protect.
YouTube
Regards

Thanks Mr. Mile S. I post 2 PSU PCB. Please guide me which one we use for SR20 with 30Vac transformer.
1 pic. already operated on 28v ac.
2 pic working on high voltage 40Vac for bigger amp. If we use this PSU on 30Vac then please guide me what change we need.
Regards
Gurpreet

 

[Gurpreet Turna]

SR100F

Final schematic on post #1700.
I will share pcb later.

Regards

Hello QQ12e5k1, please share the PCB layout of SR100F.
Regards
Gurpreet

 

[Yuriy64]

Some picture of my SR100F, singing very good, relaxing....
Offset can be set to zero with trimpot, testing only with 25 mA bias because heatsink is too small.

Friends, please tell me where can I download the board for this amplifier (SR100F)? I can not find.

 

[AdeS]

Yuriy64, take a look here.

 

[Yuriy64]

Some picture of my SR100F, singing very good, relaxing....
Offset can be set to zero with trimpot, testing only with 25 mA bias because heatsink is too small.

Yuriy64, take a look here.

Hi, AdeS.
This link leads to the APEX SR100 board with the LF411 chip. I'm asking for a circuit board on APEX SR100F with FET 2SK117.

 

[QQ12e5k1]

SR100F

Hello QQ12e5k1, please share the PCB layout of SR100F.
Regards
Gurpreet

Here it is...

 

[Yuriy64]

Here it is...

Hi QQ12e5k1 , Thank you very much, this is what I need.

 

[Sunny22g]

Hi QQ12e5k1 , Thank you very much, this is what I need.

There is resistor near bias 1k change. To 1k5

 

[Yuriy64]

There is resistor near bias 1k change. To 1k5

OK, Sunny22g, Thank you.

 

[Gurpreet Turna]

Here it is...

Thanks MY Friend for PCB layout pdf.
Regards
Gurpreet

 

[Gurpreet Turna]

Hello Mr. Mile and QQ12e5k1, I m going to make SR100F but 2SK117 now not available in market stores, When I ask for equivalent, then he suggest me 2n7000, but when I see his electrical diagram different from 2SK117.
My question is can I go with 2n7000.
Regards
Gurpreet

 

[karachay]

Schematic of Speaker Terminal.

hi all any one can tell me why 800v 40A triac? can we use another triac?

if it need to be 800V 40A i cannot find it here can i use BTA 41 ? its look like same 800V 40A. here is datasheet.

BTA41 pdf, BTA41 description, BTA41 datasheets, BTA41 view ::: ALLDATASHEET :::

 

[overpower]

My question is can I go with 2n7000.
Regards
Gurpreet

You can try to use maybe J201 which is available.

 

[chat72]

Hi, I builded fr100 using file in post 2140 that Terry uploaded and I have a problem with offset, they are 90mv and 125mv.

I'm using 30-0-30vac and vdc drop from +/-42 no-load to +/-32 with load, which is kind of high. Bias is set to 90ma for each pair. The modules passed light bulb test.

I matched input Tr but I cannot be sured if the reading are corrected or not. I've builded ax14 without matching before and the offset never exceeded 50mv so I'm not sure if there is something wrong. What should I looking for? Any suggestions?
Thank

 

[clpk]

Hello, someone makes it available in PDF to transfer with toner the Apex PSU75 pcb. Thanks.

 

[clpk]

Hello, I have another question, it may be simplistic for many members, but for me to understand better how the protection works: is the PRO input of the protection circuit simply connected to the output transistor emitter? So this way in any amplifier is it possible to connect a protection circuit? Thank you and I hope to solve this doubt because I want to put a protection on an amplifier that does not have it.

 

[clpk]

Someone to help ...

 

[still4given]

Hello, I have another question, it may be simplistic for many members, but for me to understand better how the protection works: is the PRO input of the protection circuit simply connected to the output transistor emitter? So this way in any amplifier is it possible to connect a protection circuit? Thank you and I hope to solve this doubt because I want to put a protection on an amplifier that does not have it.

Yes, the protect circuit measures the voltage across the emitter resistor.