100W Ultimate Fidelity Amplifier

[pallab]

My AX-20 Build (3 pairs) using QQ12E5K1 pcb.

Hi-Fi sound, with softer treble than AX-14!
You can never get tired of listening music, even at a loud level!

can you please share pcb of apex ax20 ( 3 pairs)

 

[Kagz]

NX14

Apex, this is just amazing. I built the mosfet version and just replaced the P250s with 40N60 IGBTs and the results were amazing. Little heating and very good sonics were the results. I couldn't believe it. It behaves well even with a 2 ohm load with 30Vx2 ac which produces 41.5V dc. Thanx man. I loved this version

 

[apexaudio]

Apex, this is just amazing. I built the mosfet version and just replaced the P250s with 40N60 IGBTs and the results were amazing. Little heating and very good sonics were the results. I couldn't believe it. It behaves well even with a 2 ohm load with 30Vx2 ac which produces 41.5V dc. Thanx man. I loved this version

Nice, can you post picture?
Regards

 

[apexaudio]

F6 idea

 

[eaglemaster]

FH11/FH9 OCB arrived!

For $2.50 each (all inclusive) I got 10 of these boards.
It will last a while until I can test it. The heat sinks are still on order.

P.S. Of course PCBs arrived! (No possibility to correct the headline!)

 

[xrk971]

Nice PCBs !

 

[minek123]

Apex, this is just amazing. I built the mosfet version and just replaced the P250s with 40N60 IGBTs and the results were amazing. Little heating and very good sonics were the results. I couldn't believe it. It behaves well even with a 2 ohm load with 30Vx2 ac which produces 41.5V dc. Thanx man. I loved this version

NX14? The only change was output devices?
Very interesting. Any measurements available?

 

[vargasmongo3435]

nice PCB eaglemaster love the rounded corners too ^_^

 

[Djaja Chan]

FX10

hello Mile, i build the fx10 and have around 29v dc on output, rails voltage +/- 35 v, but if the 2 resistor (22k) connected to each emitter A837 & C4793, on output have around 2 mv dc. is it ok to change like this ? btw this amp have a good sound (for me) thanks

 

[sajti]

For $2.50 each (all inclusive) I got 10 of these boards.

From Pcbway, I guess

Sajti

 

[apexaudio]

hello Mile, i build the fx10 and have around 29v dc on output, rails voltage +/- 35 v, but if the 2 resistor (22k) connected to each emitter A837 & C4793, on output have around 2 mv dc. is it ok to change like this ? btw this amp have a good sound (for me) thanks

Can you post voltage measurements on 2k2 and 220R resistors?

 

[stocktrader200]

Kagz , that device has huge thermal problems. the VGE (vgs) theshold on the device changes from 6.x to 5.x from 100C to -55C and the current changes from 0 to 25A over that range.

 

[dobrivoje]

hello Mile, i build the fx10 and have around 29v dc on output ...

Connect signal gnd and power gnd.

 

[eaglemaster]

From Pcbway, I guess

Sajti

Exactly!

 

[Djaja Chan]

Can you post voltage measurements on 2k2 and 220R resistors?

here it is, thanks for your attention

 

[slowhands]

hello Mile, i build the fx10 and have around 29v dc on output, rails voltage +/- 35 v, but if the 2 resistor (22k) connected to each emitter A837 & C4793, on output have around 2 mv dc. is it ok to change like this ? btw this amp have a good sound (for me) thanks

Usually the current source resistors (22K) would be connected to the power rails (+-40v here). I can see no benefit to the connection to the VAS shown in the design.

 

[sandeep kayarkar]

Many many happy returns of day Mr mile

 

[prasi]

Happy birthday Mr. Mile..

 

[sownel]

Happy birthday mr.mile

 

[ekasamsoni]

Hi, mr.mile, how to set bias in ax14?