Best DIY Preamp II

[adason]

The α10 stereo pre-amplifier

seems i have all the parts needed for a20 line stage
where can one get pcb? you sell it directly?

 

[amb]

seems i have all the parts needed for a20 line stage
where can one get pcb? you sell it directly?

AMB audio shop

 

[adason]

thanks, that was easy, ordered!

 

[marconi118]

Could you post a schema of a10 here?

 

[amb]

Could you post a schema of a10 here?

Just follow the link to the website and it’s all there.

 

[adason]

AMB audio shop

you could not make those boards any smaller, could you 🙂

 

[amb]

you could not make those boards any smaller, could you 🙂

Making it very compact was a α20 line stage design goal, so that it can fit in many applications.

 

[tvrgeek]

AMB audio shop

THanks for that link. Good stuff and links to more good stuff.

 

[adason]

Making it very compact was a α20 line stage design goal, so that it can fit in many applications.

what is bias on the outputs? how many mV on those 2.2 ohms? thanks

 

[PRR]

what is bias on the outputs? how many mV on those 2.2 ohms? thanks

LINK to The α20 line stage amplifier
"The input stage current is 3mA, the VAS stage current is 14mA and the output stage quiescent current is adjustable (typically 30mA to 80mA). "

 

[Bigun]

Ok, so maybe instead of a game of luck where you choose one recommendation for "the best" how about a modular breadboard approach starting with a source selector switch, an attenuator (there's various approaches) and maybe the M2 kit from the diyaudiostore. Ditch the output boards and use the different buffers and see what you like best. Build a simple power supply with Jung/Didden Superregs at the output, or rather the power in for the boards, and you have something going.

+1

 

[adason]

LINK to The α20 line stage amplifier
"The input stage current is 3mA, the VAS stage current is 14mA and the output stage quiescent current is adjustable (typically 30mA to 80mA). "

Thanks!

 

[adason]

Can a20 drive high impedance headphones?
Say 300 ohm sennheiser?

 

[LinuxGeek]

Sry, post deleted, misklicked. Wrong forum.

 

[amb]

Can a20 drive high impedance headphones?
Say 300 ohm sennheiser?

Yes, it can drive headphones. 32Ω to 600Ω headphones are no problem, and of course high impedance such as a power amp are an easy load for α20.

 

[adason]

Good to hear that. I like the sound, so I will put it in nice box, so I may as well use headphone jack besides line level out.