Studio Reference Amplifier

[rohin]

hi to everyone,what is advantage of this buffer? for good quality sound like dj what i need before amp? i have mixer and crossover.please anyone tell me what i do for good quality.thank you.

 

[dobrivoje]

Hi dobrivoje, beautiful work!
Can you draw a pcb for this Apex buffer? Many Apex amplifiers can be used with this.

Yes, I'll do it for you, but you must wait for a few days. I don't use any CAD program, I draw each pad and track. Also, I'm not experienced as AlexMM, Olaf or Mile, so my designs may not be optimal, but I'll give my best.

 

[thole]

Apex SR PP12 not tested. 80 x 42.5 mm.

Thanks dobrivoje, for fast respon. I will build this.

Regards

 

[apexaudio]

hi to everyone,what is advantage of this buffer? for good quality sound like dj what i need before amp? i have mixer and crossover.please anyone tell me what i do for good quality.thank you.

Use this preamp.

 

[thimios]

Yes, I'll do it for you, but you must wait for a few days. I don't use any CAD program, I draw each pad and track. Also, I'm not experienced as AlexMM, Olaf or Mile, so my designs may not be optimal, but I'll give my best.

Thanks,take your time.I can wait for this.
A simple buffer like this, with common parts is useful.

 

[thimios]

Use this preamp.

Thanks Mr.Mile this is another option.

 

[44250]

Yes, I'll do it for you, but you must wait for a few days. I don't use any CAD program, I draw each pad and track. Also, I'm not experienced as AlexMM, Olaf or Mile, so my designs may not be optimal, but I'll give my best.

off-topic: dobrivoje, do you visit any serbian diy forum and if you do what is your nick there?

 

[rohin]

Use this preamp.

thanks i will try this please give me black layout file and size if you have.

 

[dobrivoje]

off-topic: dobrivoje, do you visit any serbian diy forum and if you do what is your nick there?

Hi, Alexander. Here I am dobrivoje and on ES and you-know-where I am fokussd.
Pozdrav - best regards.

 

[44250]

good to know - we allready know each other! greetings!

 

[rohin]

Apex SR PP12 not tested. 80 x 42.5 mm.

you forgot to add apex logo on this pcb.apex logo must be on pcb which is design by apex audio.

 

[rohin]

hi lord of amps,which is best suit preamp for sr150 pp8 or pp12?

 

[apexaudio]

hi lord of amps,which is best suit preamp for sr150 pp8 or pp12?

From post #1804

 

[dobrivoje]

you forgot to add apex logo on this pcb.apex logo must be on pcb which is design by apex audio.

I always try to put some text on pcb design. When you make your own pcb's it's the simplest way to control proper side of film. A few times I flipped film in the wrong way, so I had to etch again .
You can see text on PP8, but on PP12 I didn't have enough room to put visible text. I could use very small letters, but there's no reason if you can't read text.
I don't use Apex logo, I leave it to Mr. Mile. I use different font, so you know it's Apex clone.

 

[rohin]

hi apex sir,i have 225va transformer and 14700 (10000+4700)uf per rail with 6 ampere diode.dc voltage +-55 and +-24(for sr preamp) and 5vdc for mp3 palyer.is 14700uf per rail is enough for sr150 stereo?thanks.

 

[apexaudio]

hi apex sir,i have 225va transformer and 14700 (10000+4700)uf per rail with 6 ampere diode.dc voltage +-55 and +-24(for sr preamp) and 5vdc for mp3 palyer.is 14700uf per rail is enough for sr150 stereo?thanks.

14700uF is ok.

 

[rohin]

sr 150 pcb

today i made pcb of apex sr 150 for two channel.now i have to arrange some component which i don't have.44250 how much ac voltage is required for protection circuit.thanks for guide me.

 

[44250]

my SR150 works with 2x35Vac transformer,and that is a voltage that you connect to AC/AC on left/bottom side of pcb. AC/AC are connectors to supply protection circuite. you have a schematics of protection circuite in a post where i posted that pcb,instead 2N5401 better use BC516 (reversed pinout!!!),there is also an explanation how to chose resistor 560r,depending on your relay coil resistance.

protection circuite is based on APEX simple protection,only i changed voltage direction and with it polarity of diodes and capacitors and type of transistors (npn to pnp).

there is also clip-indication on this pcb.

here are all those schematics used on pcb again:

 

[apexaudio]

SR150 upgrade

 

[rohin]

hi apex sir,i am trying to match hfe of all transistor of sr 150.sir what is proper bias current of sr 150 with good heat sink ? if i get some mv on output can i set this by this 1 k pot? thanks.