100W Ultimate Fidelity Amplifier

[davidus]

Hi everyone.
I have just completed drawing my own PCB based on the symmetrical design that has been already posted here. This PCB design has wider tracks.

Please, if someone can check whether there are any errors in it. If everything is OK, than I will share the files in PDF format, so everyone can use them.

Thanks.

 

[Brownstocker]

very intersting i can't wait to try it specialy after u posted the pcb pattern .... thanks alot apex

 

[panggih]

Mr.Mile, this is my ax14. the problem is still the same as the time it C.without input connection, and then immediately turned ax14 cried like horn, huuumm, and noisy.
I also tried to remove the capacitor 100nF then I replace it with a jumper, but the result is still the same. please correct my mistake

sorry for english

 

[wiljj78]

Did you check this point??? looks like it's shorted

Try to post clear pictures and measurements (rail voltage,DC offset, etc) it will be more easy to all diy freinds to help...

Regards,

 

[cjkpkg]

Mr.Mile, this is my ax14. the problem is still the same as the time it C.without input connection, and then immediately turned ax14 cried like horn, huuumm, and noisy.
I also tried to remove the capacitor 100nF then I replace it with a jumper, but the result is still the same. please correct my mistake

sorry for english

Please sketch out your grounding scheme.

What worked for me was rca input ground to amp board
Input ground to chassis star ground
Amp board ground to PSU ground
Speaker ground to PSU ground

I did try the third suggested wire from input ground to PSU ground but found the amp to be most quiet without that connection.

 

[Arif Budiyanto]

Try to post clear pictures and measurements (rail voltage,DC offset, etc) it will be more easy to all diy freinds to help...

Regards,

My experience was connect input rca ground into PSU ground fixed my systems' problem...before you hook your amp to your speaker, please measure the dc offset first..
state here your dc offset first...what rail voltage do you have?
Best Regards
Arif B

 

[lycanlk]

Apex B80 as a car amp with an SMPS

Thank you Mile for the simple and powerful design! good enough for a 10" woofer. Next step is D200.with +/- 75v supply and with low Rds drivers

 

[44250]

you will have a lot of power with d-class amp that´s for sure! what power is that smps? it look´s really simple...

 

[apexaudio]

Thank you Mile for the simple and powerful design! good enough for a 10" woofer. Next step is D200.with +/- 75v supply and with low Rds drivers

Nice work,
Regards

 

[Hadighorbani]

Hi all friends
i want use AX14 instead B80 in my car
can i use AX14 in 2 ohm load ?
any suggestion?
what about D14 ?
sir mile use it in home.
thanks

 

[lycanlk]

you will have a lot of power with d-class amp that´s for sure! what power is that smps? it look´s really simple...

Yes. Its a very simple smps driven 2 FETs by SG3525.
No input and output filters.
I followed a couple of DIY projects and requested my friend to design a PCB for me
It runs at 50Khz
The transformer ETD39, I wound it myself. Hope it can produce about 200W.
voltage regulated for +/- 35

Cheers!

 

[DILIP KUMAR]

this look

 

[igsnet]

This amplifier (apex ax14) is better than the hybrid stk?

 

[igsnet]

someone?

 

[highand]

This is, the simple 100W amplifier.

Ultra low distortion (0.0005%). Beautiful sign, the border is reached (clipp). The output power transistors can not be opened ever crossed. The current level is not increased if there are fast and clipp signals simultaneously. The operational amplifier strengthens the useful signal to 0 dB, the error signals are amplified 30 dB. Final result, the error signals are reduced more than 20dB. Built-in protection work if over 10A

 

[44250]

This is, the simple 100W amplifier.

Ultra low distortion (0.0005%). Beautiful sign, the border is reached (clipp). The output power transistors can not be opened ever crossed. The current level is not increased if there are fast and clipp signals simultaneously. The operational amplifier strengthens the useful signal to 0 dB, the error signals are amplified 30 dB. Final result, the error signals are reduced more than 20dB. Built-in protection work if over 10A

why not in new thread? any pcb,pictures of finished amp or even video perhaps?

 

[opor]

Hi Apex
Regarding to your signal led+clip schematic, I have done it but it seem clip at lower signal than I expect .So can I replace 15V zener diode with lower value such as 5.6 V?

 

[donnym]

Resistor 47ohm burned

Greetings all ... this my first post ...

I tried to assemble B80/ax12 by modifying of PCB ocl150 old.
when turned on, 47ohm resistor on the emitter transistor 2n5551 fire continues, but the transistor was not burned.
what makes a resistor 47 fire hold?
please help.......


sorry about my English poor
thanks

 

[Hadighorbani]

Greetings all ... this my first post ...

I tried to assemble B80/ax12 by modifying of PCB ocl150 old.
when turned on, 47ohm resistor on the emitter transistor 2n5551 fire continues, but the transistor was not burned.
what makes a resistor 47 fire hold?
please help.......


sorry about my English poor
thanks

hi
i was used this amp in my car.
this amp work well
it worked in first time
chek your teransistors pin

 

[donnym]

hi
i was used this amp in my car.
this amp work well
it worked in first time
chek your teransistors pin

thank you sir for your advice
i was check transistor 2n5551 pin, it's right. i check the other Tr, I check tr bc556 pin, the pin is rotated between the emitter and the Tr colector and two damaged. I've replaced it and tried to turn on, the resistor is not burning anymore.
once again thank you sir.