100W Ultimate Fidelity Amplifier

[xrk971]

hi everyone here is the update of PCB apex A16 hope OK now thank you if any mistake correction any suggestion please, and i remove the optional inductor coil

Nice work. I would make input BC546 flat face each other and thermally bond them with heatshrink tubing to give good thermal tracking.

Flip local heatsink near BC546 LTP to reduce heat effects.

That long left right loop of ground and speaker out is not good as it may induce current and is a long track for high current to go. Can speaker our be placed up high away from input stage transistors where noise pickup may be an issue?

 

[xrk971]

Nice work. I would make input BC546 flat face each other and thermally bond them with heatshrink tubing to give good thermal tracking.

Flip local heatsink near BC546 LTP to reduce heat effects.

That long left right loop of ground and speaker out is not good as it may induce current and is a long track for high current to go. Can speaker out be placed up high away from input stage transistors where noise pickup may be an issue?

 

[panggih]

Too bad, I'm not on facebook...
Any chance it can be copied to diyaudio?

this is FH12 mod by Bimo,layout by Zaki

 

[AndrewT]

hello sir apex audio how many watts capable of this A16?

one pair of 2sa1943/c5200 is good for approximately 60W into 4ohms, or 50W into 8ohms.

 

[minek123]

this is FH12 mod by Bimo,layout by Zaki

Thanks!!!!

 

[I love the sound]

Hi sir Apex i found this amp on internet and i want to make it, so this pcb is good? What model of amplifier is? I can use 2sa1941 2sc5198 at +- 50V? Thanks and sorry for my english.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[44250]

that should be an Apex AX14 triple emitor follower, and if it is correct pcb it should sound �� really good,and also have a lot of power.

 

[stewin]

that should be an Apex AX14 triple emitor follower, and if it is correct pcb it should sound �� really good,and also have a lot of power.

hi 44250 where is the schematic??

 

[AndrewT]

Have a look in the Apex directory.

 

[I love the sound]

I think that is AX 20 with 3 pairs, only sir Apex can tell us what model is.

An externally hosted image should be here but it was not working when we last tested it.

 

[apexaudio]

I think that is AX 20 with 3 pairs, only sir Apex can tell us what model is.

An externally hosted image should be here but it was not working when we last tested it.

Yes it is AX20 with 3 pairs but not my work.

 

[I love the sound]

Hi sir Apex, just have finised the F100 and i have DC on output. The changes we have made is: BF420, BF421 replace with KSP44, KSP92 and 5r6 2w replace with 4r7 3w. Where did I go wrong? I tested the irfp transistors in another amplifier and are okay. Yellow light does not light. Please help my I'm a beginner. Thanks.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[AndrewT]

your soldering looks quite dull.
What solder are you using?
I hope it is leaded: 63/37 eutectic

 

[apexaudio]

Hi sir Apex, just have finised the F100 and i have DC on output. The changes we have made is: BF420, BF421 replace with KSP44, KSP92 and 5r6 2w replace with 4r7 3w. Where did I go wrong? I tested the irfp transistors in another amplifier and are okay. Yellow light does not light. Please help my I'm a beginner. Thanks.

Connect input GND to PSU GND

 

[I love the sound]

your soldering looks quite dull.
What solder are you using?
I hope it is leaded: 63/37 eutectic

Is a solder from polonia and is very bad solder have much (solder paste) rosin.
It is the first time i`m use this solder.

 

[I love the sound]

Connect input GND to PSU GND

Conected and works! Thank you very much. Good sound

 

[prasi]

Is a solder from polonia and is very bad solder have much (solder paste) rosin.
It is the first time i`m use this solder.

have a look at some soldering videos, it should look shiny.

recently i was soldering a 3 pin connector from a no name supplier, it wasn't getting soldered at all even after much heating, then i changed to TE 3-pin connectors, it was buttery smooth solder effort.. very very clean finish!

 

[still4given]

I had a whole roll of solder that that produced a dull finish. It was difficult to keep the tip clean as well. I never had a problem with continuity but it was not fun to use.

 

[prasi]

well, here you got 2 experiences.... component pin problem or solder wire problem.... take your flavor!

 

[vinski80]

Mr. Mile,

I have a power supply of +/- 40Vdc volts, will it be enough for AX-14 without compromising the output power and the good sound quality of the amplifier?

Regards,
Vinski