Studio Reference Amplifier

[Hicoco]

SR200

Nice project and layout. What kind of 3 pins input is that? 😱

Thanks, Molex MicroFit 3.0 serie 43650

 

[smartx21]

I wonder his question was about the "REF" input.

 

[r_jik45]

Hicoco, thanks for the reply, but as Vostro and smartx21 wrote, the question was more about the nature of the input (REF), not really about the connector itself 😉

 

[Hicoco]

i will use the P30zf preamp with a 10uF Mundorf at output, i would like to try the difference without the 10uf at the input of the SR200

 

[Sunny22g]

Hello guys apex sr 200 is best amplifier.but it's only 8 ohm on high voltage like 45-0-45 ac .but cannot stability on 4 ohm . without drop ac supply.

 

[Sunny22g]

sir mile

sir mile when i use ac 45-0-45 dc covert 63-0-63 but amp is not stable on 4ohm .in this form u say 65-0-65 dc is stable on 4 ohm .i just attach picture
my 10 ohm resistor burn .when i use 4 ohm.i hope u can help me

 

[44250]

what are the signs of instability?

 

[Sunny22g]

Hello sir

Hello sir.i attached picture which resistor is burn on 45-0-45 ac on 4 ohm.but when I drop ac volt like 30-0-30.then is working on 4 ohm .and resistor not burn. I hope u understand sir .thanks. It's 10 ohm

 

[r_jik45]

Hi Sunny22g, where is this layout from? (post number?)
As far as I know Alex_mm's latest layout version for the sr200 is 3.1. Here you show a version 3.2.

 

[AdeS]

"here it's the files" SR 200 V3.2

 

[r_jik45]

Thanks Ades! Page 117/325 😀

 

[Sunny22g]

"here it's the files" SR 200 V3.2

I also used miles layout.but I show witch resistor burn.i use 3.1

 

[r_jik45]

Now it's about 'translating' the pdf layout into pcb files.
No direct import function; so far the best would be to change the pdf into a dxf file then import it to get a footprint in order to put the components and redo the traces.

 

[prasi]

If you use sprint, image can be imported and layout can be copied with less time...

 

[thimios]

Hello sir.i attached picture which resistor is burn on 45-0-45 ac on 4 ohm.but when I drop ac volt like 30-0-30.then is working on 4 ohm .and resistor not burn. I hope u understand sir .thanks. It's 10 ohm

Look here, read some posts to find about the right compensation. Studio Reference Amplifier

 

[r_jik45]

If you use sprint, image can be imported and layout can be copied with less time...

Thanks for the info 😉
Indeed, had a look at sprint. This function is very convenient, but did not really plan to learn how to use yet another software 😱
And still requier to redo the pcb on top of the image. Will see when time comes.

 

[Sunny22g]

Look here, read some posts to find about the right compensation. Studio Reference Amplifier

Thanks sir for helping me..I read many post ..but my question is if I change R11 R18 . which you recommend .is this stable on 4 ohm 45-0-45 ac supply. I also use 18 pf capacitor.

 

[Mor7040]

hi there are files or gerber x produce pcb from apex sr 100/200/300? thank you

 

[viki_v2]

if you do an amplifier on my earlier files,you should pay attention on 2N5401 and his Hfe - it should be at least 250. is it enough you can check by measuring it´s Uce,it should be under 1V. if you don´t have it you can use another one,for example BC560C or BC516 but you must check pinout diference.

on files under this post there is PCB with BC516 placed instead 2N5401,and here is a part list for that version:

10r x6
47r x2
100r x3
1k x10
220r x9
2k2 x2
15k x2
22k x2
47k x1
100k x1
220k x3
360r (Rrel) x1

1r 2W x12
6k8 2W x1
4r7 2W x2
560r 2W x1

Relej x1
Osigurač-postolje x2 (FUSE)

LED 3mm x1
LED 5mm x1
2SA1943 x2
2SC5200 x2
MJE340 x2
MJE350 x2
2N5401 x1
2N5551 x3
2SC4793 x1
2SA1837 x1
BC516 x1
BC557 x2
BD139 x1
MPSA42 x1
MPSA92 x2

1N4007 x3
ZD15V x2
1N4148 x10

10pFx1
470pF x2
100nF63V x5
100nF100V x1
1nF63V x1
1uF 100Velk. x1
10uF50V-blok x1
100u25V x1
47u100V x1
220u25V x2
220u63V x4
470uF16V x1

What is A1 and A2 on pcb

 

[smartx21]

One must interconnect these points (long jumper).