100W Ultimate Fidelity Amplifier

[olafk]

Nice! will you attach the foil?

For sure.
But not before PCB is checked. Was to late this evening.

regards

 

[44250]

Much success with the A23, great layout - I'm very curious about the sound 🙂.

regards Olaf

thanks Olaf,most of it was your work (A17 and A20tef) only adjusted to fit A23 🙂 good luck with "flat amp" 🙂

 

[44250]

138x99mm,with single and dual op-amp,Zobel network,PRO circuit to suite to NE555 protection,CLIP indication...

 

[apexaudio]

Here the very first design for the A9. A little bit unusual format, but enough for a first test 🙄. Could be a little flat amplifier.
Not tested - coming weekend. Notes gladly welcome.

regards Olaf

Very nice pcb, I use it instead of mine,
Regards

 

[apexaudio]

138x99mm,with single and dual op-amp,Zobel network,PRO circuit to suite to NE555 protection,CLIP indication...

Nice work,
Regards

 

[apexaudio]

Here the very first design for the A9. A little bit unusual format, but enough for a first test 🙄. Could be a little flat amplifier.
Not tested - coming weekend. Notes gladly welcome.

regards Olaf

There is mistake on your pcb: base MPSA92 must be conect to colector BC550 not to base... you can connect SGND to PGND (by mistake note as OUT on your pcb)

 

[44250]

138x99mm,with single and dual op-amp,Zobel network,PRO circuit to suite to NE555 protection,CLIP indication...

 

[still4given]

There is mistake on your pcb: base MPSA92 must be conect to colector BC550 not to base... you can connect SGND to PGND (by mistake note as OUT on your pcb)

Maybe use a BD139 there?

 

[apexaudio]

Maybe use a BD139 there?

No need, current is only 2mA.

 

[still4given]

No need, current is only 2mA.

Yes,but pinout will work as-is. How about a ksc1845 then?

 

[apexaudio]

Yes,but pinout will work as-is. How about a ksc1845 then?

Pinout is ok, track must be break and connect to BC550 colector as I mark on picture with red line.

 

[olafk]

Pinout is ok, track must be break and connect to BC550 colector as I mark on picture with red line.

Hello,
thanks for the effort and the information, I'll check everything again and build a prototype at the weekend. I'm looking forward to it.

regards Olaf

 

[still4given]

Sorry, I was looking at different transistors.

 

[olafk]

PCB - yet done quickly (sorry for the bad photo).
Tomorrow I have to work, but maybe Sunday 🙂 ...

regards Olaf

 

[44250]

too bad that there is no "Like" button on this forum... 🙂

 

[apexaudio]

PCB - yet done quickly (sorry for the bad photo).
Tomorrow I have to work, but maybe Sunday 🙂 ...

regards Olaf

Nice pcb, don't forget SGND connect to PGND,
Regards

 

[44250]

138x99mm,with single and dual op-amp,Zobel network,PRO circuit to suite to NE555 protection,CLIP indication...

 

[maxwell007]

I already done with one chanel ...very easy to build, just need set bias and play.. picture show sine at 100khz, square at 10khz and 20 khz...

short video...

Apex A14 - YouTube

 

[stocktrader200]

what are the A23 distortion figures?

 

[vargasmongo3435]

really nice sir, I bet it sound really nice maxwell007 😀


Regards
Juan