100W Ultimate Fidelity Amplifier

[apexaudio]

Thanks to Apex,
You really save me...
I hope this one is okay to continue
if not okay yet, I will make new design again...
If okay I will made it soon

Hi Arif,
sudah cek PSU belum, kayaknya kapasitor atau elkonya yg masalah

Thanks

Regards

This pcb is OK,
Regards

 

[dodoet]

hi mr.Mile? whether AX14 can supply PSU 63VDC with 2pair transistor 2sc5200/2sa1943?

 

[JOHN BALI]

This pcb is OK,
Regards

Ok, then continue...
some pictures
this is how I made my "hand made PCB"
maybe useful to someone else
made it with steel needle, permanent marker & scratch
scratch with a piece of cutter blade that I tied in a pencil to correct the drawing
I hope that picture enough to explain what I'm doing

@dodoet
if we add another 2 pair it is not AX14 anymore, maybe you can make AX20 instead, don't forget to share
see page 92...
I'm also have a plan to add 1 pair more to AX17 but maybe it not necessary
made same or close to the schematic first then we can modifies later


Regards

 

[apexaudio]

Nice 'hand made' pcbs

 

[AndrewT]

The way we were before we allowed computer nerds to take over the world !

 

[JOHN BALI]

Nice 'hand made' pcbs

But I don't have 22uF/63v & 22Uf/100v
so if I use 33uF/50v or 47uF/50v for all 22uF's is that okay?
which one do you suggest? 33uF or 47uF?

also for 33pF, only have 22pF & 47pF
so which one again?


Regards

 

[apexaudio]

But I don't have 22uF/63v & 22Uf/100v
so if I use 33uF/50v or 47uF/50v for all 22uF's is that okay?
which one do you suggest? 33uF or 47uF?

also for 33pF, only have 22pF & 47pF
so which one again?


Regards

Use 47uF and 47pF,
Regards

 

[apexaudio]

NX16 made by 44250 APEX NX16 proba u ku?i/testing in the house AVI - YouTube

 

[JOHN BALI]

My AX17s duel

Use 47uF and 47pF,
Regards

ok, almost done...
for testing I will use "bulb tester"
It is same as testing AX14?
And for bias
2 volt on 100nF or 15 mV on 0R33? What is the ideal voltage there?
I will supply 32v from transformer or better with lower voltage first?

I make 2 AX17 with different transistor, hope that not any problem happen

Regards

 

[apexaudio]

ok, almost done...
for testing I will use "bulb tester"
It is same as testing AX14?
And for bias
2 volt on 100nF or 15 mV on 0R33? What is the ideal voltage there?
I will supply 32v from transformer or better with lower voltage first?

I make 2 AX17 with different transistor, hope that not any problem happen

Regards

Nice work, yes testing is same as AX14 and set 15mV on 0R33 for bias (50mA)
Regards

 

[apexaudio]

Voltage 2x32vac on transformer will be OK, but you must disconnect transistors from heatsink, use liskun isolator.

 

[apexaudio]

The way we were before we allowed computer nerds to take over the world !

New way for 'hand made' pcbs
Homemade inkjet pcb printer-1 - YouTube

 

[irwanks]

New way for 'hand made' pcbs
Homemade inkjet pcb printer-1 - YouTube

it was a modified inkjet printer

 

[JOHN BALI]

passed 1st test

Voltage 2x32vac on transformer will be OK, but you must disconnect transistors from heatsink, use liskun isolator.

Like this picture?

I'm happy now, thanks to Apex

These AX17s just passed the test easily
the sound is very clear even I use ugly speaker without enclosure
just for first test...
both of AX17's offset are very low, I try to hear any hum but nothing on that speaker just like it was disconnected from the amp
maybe my cheap digital tester was broken, I also can't measure voltage on 0R33.

my AX17s not use trimpots, because i don't trust trimpot that I bought.
I replace 220 + 1k trimpot with single 330ohm resistor & I got about 2.30volt on C7(100nF)
Is this voltage need to be increase or decrease?
AX17 using TEF right, or just similar look?
so if I increase to 3,2volt(with big heatsink & enought supply) it is possible?
because there was someone told me that he run the TEF amp with 3,2volt bias voltage, even more..

For other DIYer you also need to try this AX-series
I also want to make the AX14 like what Apex recommended to compare with this AX17.
As usual with new way hand made PCB(my version)


Thanks again

Regards

 

[apexaudio]

Set 15mV across 0,33R for 50mA bias. PN voltage is 550mV like zener voltage, and you can't set bias with measure Vbe multiplayer voltage, and for TEF it's will be about 3,2V for any bias current. With 2,4V on Vbe multiplayer amp work in class B.
Regards

 

[apexaudio]

Like this picture?

I'm happy now, thanks to Apex

These AX17s just passed the test easily
the sound is very clear even I use ugly speaker without enclosure
just for first test...
both of AX17's offset are very low, I try to hear any hum but nothing on that speaker just like it was disconnected from the amp
maybe my cheap digital tester was broken, I also can't measure voltage on 0R33.

my AX17s not use trimpots, because i don't trust trimpot that I bought.
I replace 220 + 1k trimpot with single 330ohm resistor & I got about 2.30volt on C7(100nF)
Is this voltage need to be increase or decrease?
EAX17 using TEF right, or just similar look?
so if I increase to 3,2volt(with big heatsink & enought supply) it is possible?
because there was someone told me that he run the TEF amp with 3,2volt bias voltage, even more..

For other DIYer you also need to try this AX-series
I also want to make the AX14 like what Apex recommended to compare with this AX17.
As usual with new way hand made PCB(my version)


Thanks again

Regards

Any sound difference SanKen vs Toshiba

 

[JOHN BALI]

Okay, so I need to increase it to 3,2volt & also measure voltage on both 0R33
the more important is the voltage on those resistor. Ok, I get it

TEF for 4 ohm load.

I just go back on this page, TEF for 4 ohm load
If there any possibility to try this amp on 2 ohm load?
Maybe on 2 x 25 vac
I just want to know
my plan is used this amp on 8ohm speaker

Any sound difference SanKen vs Toshiba

When I test it at first time I don't use good speaker
but I hear a little sound difference SanKen vs Toshiba
Toshiba seems clearer (mid high) than SanKen, but the bias not really fair I guess
since Sanken maybe need a more bias (my guess)
I will set proper bias then
I will make it sure when I finish this project
Perhaps I also can make visual measurement with any PCscope

Regards

 

[apexaudio]

Okay, so I need to increase it to 3,2volt & also measure voltage on both 0R33
the more important is the voltage on those resistor. Ok, I get it


I just go back on this page, TEF for 4 ohm load
If there any possibility to try this amp on 2 ohm load?
Maybe on 2 x 25 vac
I just want to know
my plan is used this amp on 8ohm speaker

Regards

For 2 ohm add another pair of outputs, and VI limiter is recomanded, but for home audio it's work without changes.

 

[Zinyx]

AX14

I have made PDF file, if someone want print more PCB in one page A4, everything is a mirror reflection for thermo-transfer.

 

[apexaudio]

I have made PDF file, if someone want print more PCB in one page A4, everything is a mirror reflection for thermo-transfer.

Thank you,
Regards