Retro Amp 50W Single Supply

[apexaudio]

Nice, many thanks apexaudio. I will try the circuit soon. And what do you think of it's possible quality compared to the old circuit by Robert Penfold posted a few pages back? I've wanted to remove the output cap by using split power supply. Could you please provide such circuit with single ended input and split power supply?


BTW, what is the voltage supply range?

AX5 CFA amplifier, AX6, AX8 and FX4 supply range is from 50V to 80V DC.

 

[apexaudio]

This is AX5

 

[prasi]

FX4

keeping the same drilled holes for o/p and same PCB (well almost), here is FX-4.
A very rough draft. If anyone spots an error, please let me know.

regards
Prasi

 

[johnego]

Thanks apexaudio

 

[apexaudio]

Thanks apexaudio

AX5 use darlington output transistors like BDT64C/65C or similar, not BDT87/88.

 

[prasi]

Mr. Mile, can you confirm if the single rail regulated PSU (post #92) can work in dual rail mode too with appropriate schematic modification and devices?
regards
prasi

 

[apexaudio]

Mr. Mile, can you confirm if the single rail regulated PSU (post #92) can work in dual rail mode too with appropriate schematic modification and devices?
regards
prasi

There is PSU5
Studio Reference Amplifier

 

[prasi]

thanks Mr. Mile. can use a single dual rail PSU 5 to supply two channels of 100W amp (at normal listening levels-home use, never at full power).

regards
Prasi
PS Here is a somewhat better looking FX-4, although I very much doubt there will be any interest because of the cost and vanishing act of laterals .

 

[apexaudio]

thanks Mr. Mile. can use a single dual rail PSU 5 to supply two channels of 100W amp (at normal listening levels-home use, never at full power).

regards
Prasi

Yes, but better use PSU10

 

[Bix]

Prasi these PSU designs look great. I would love to have a test bench PSU that is versatile enough to adjust for many different amp voltages, maybe even current adjust. Investing in a good PSU would really help with other projects down the track. What do you think? Would the psu10 be the one? Im wondering also what the voltage range would be?

 

[Bix]

Thank you ApexAudio/ Mr Mile for all the designs you have generously given to the community. I'm really enjoying building my Retro 50.

Cheers

 

[boyet0173]

thanks Mr. Mile. can use a single dual rail PSU 5 to supply two channels of 100W amp (at normal listening levels-home use, never at full power).

regards
Prasi
PS Here is a somewhat better looking FX-4, although I very much doubt there will be any interest because of the cost and vanishing act of laterals .

Hi Prasi,


Would love to build FX-4. Much appreciated if you can provide pdf layout.


Thanks,

 

[johnego]

AX5 use darlington output transistors like BDT64C/65C or similar, not BDT87/88.

It's interesting. But it's scary having darlington output without the output cap. But I know you'll suggest a speaker protect But I'll try this one too, thank you.

 

[apexaudio]

It's interesting. But it's scary having darlington output without the output cap. But I know you'll suggest a speaker protect But I'll try this one too, thank you.

Use PSU100 for AX5

 

[prasi]

Hi Prasi,
Would love to build FX-4. Much appreciated if you can provide pdf layout.
Thanks,

Hello Boyet,
Here are the files. All the best for your build. Do post here when you build and test it.
regards
prasi

 

[prasi]

There is PSU5
Studio Reference Amplifier

Mr. Mile,
I wanted to fit the dual rail PSU 5 in 100mm x 100mm for chinese pcbs. So here it is. Its beautiful isnt it?
However I could only fit 30mm dia caps, which makes it 6800uf 80V or 4700uf 100V. Some 10000uF in 63 V also available .

So my question is , whether 6800uF is ok or too low?

regards
Prasi

 

[prasi]

2- pair regulated PSU.....tedious, took a long long time .. tired with making layouts, time to get on to building things...the pending projects need attention (long list....AX-6, Pass HPA-1, LM317+keantoken KMX, AKSA 55, AKSA 55N, JLH2003+B1 buffer, APEX AA9, APEX AX-14, many more)...

 

[still4given]

2- pair regulated PSU.....tedious, took a long long time .. tired with making layouts, time to get on to building things...the pending projects need attention (long list....AX-6, Pass HPA-1, LM317+keantoken KMX, AKSA 55, AKSA 55N, JLH2003+B1 buffer, APEX AA9, APEX AX-14, many more)...

That's and impressive list of amps.

 

[Bix]

Fair call Prasi, Time to get soldering. I for one am very grateful for all your hard work. Looking forward to seeing your builds mate.

 

[Bix]

2- pair regulated PSU.....tedious, took a long long time .. tired with making layouts, time to get on to building things...the pending projects need attention (long list....AX-6, Pass HPA-1, LM317+keantoken KMX, AKSA 55, AKSA 55N, JLH2003+B1 buffer, APEX AA9, APEX AX-14, many more)...

I would like 1 x pcb if available Prasi? Thanks for your efforts