100W Ultimate Fidelity Amplifier

[wiljj78]

Hello everybody. Is anyone psb Apex AX14 with 2 pairs on the output?

 

[HIFI0101]

Absolutely

Hollt ****!! im gonna build this! 😀

 

[smartx21]

Where can i find Apex v14 with 2 pairs , schematic? Thank you!

Hope you're lucky.
A Directory of Apex Audio Amplifiers

 

[morosanu22]

I found tfhis version of PCB but i didnt find the schematic for this , have anyone tried? Thank you!

 

[EssB]

No. If you don't find it, it's not too difficult to work out. Quickly comparing it with the original schematic in post #1 :
- R21,22,23,24, Q12 and Q14 are doubled up, as you would expect.
- C13 has been replaced with 10R and 2 x 1N4148 all in parallel, ground loop breaker.
Also there must be link between points J-A and J-A1, not shown on the layout.

I'll leave it with you to follow through the rest of it for any other changes.

Looks like quite a nice single sided layout, I may use it myself, when I ever get round to it.
Simon

 

[morosanu22]

I know about the link between that jumpers, ideea is that i want to know if its good because i want to do this model of module but with power transistors 2sa/2sc and bd , under pcb, twisted! Something like this!

 

[Gurpreet Turna]

It's very nice PCB Artwork.Can u share tharmo transfer PCB layout. Please share your experience during making complete board.
Regards
Gurpreet Singh

 

[morosanu22]

If anibody have any sugestions.. post please.

 

[khalsa]

very nice layout and thanks very much

 

[viki_v2]

If anibody have any sugestions.. post please.

Any differences in this pcb design and one mentioned in post 10561

 

[prasi]

No. If you don't find it, it's not too difficult to work out. Quickly comparing it with the original schematic in post #1 :
- R21,22,23,24, Q12 and Q14 are doubled up, as you would expect.
- C13 has been replaced with 10R and 2 x 1N4148 all in parallel, ground loop breaker.
Also there must be link between points J-A and J-A1, not shown on the layout.

I'll leave it with you to follow through the rest of it for any other changes.

Looks like quite a nice single sided layout, I may use it myself, when I ever get round to it.
Simon

schematic in post #1 is not final. the one in post # 22 is, IMHO.
regards
Prasi

 

[EssB]

Hi Prasi,
Yes, you're right , R2 and R8 are swapped in post #1.

 

[avtech]

Circuit was tested on +/-90V rail voltage, but with single pair 2SC5200/2SA1943 +/-56V is maximum. 80W on 8R load with low THD.
Regards

Just wanted to check what an appropriate rail voltage would be for the AX14 with dual 2SC5200?

I have a choice of 35-0-35v and 47-0-47v trannies.

Can either be used without issue?

Cheers!

 

[prasi]

Go for 2 x 0-35VAC if you have a choice and use CRC PSU pcb supplied by me.

OR
2x 0-47 VAC OR 47-0-47 VAC with apex regulated PSU.

i would always feel safer with +/-56VDC with 2 pairs of bjts😱.
regards
Prasi

 

[prasi]

(too late to edit)
OR you could use 35vac-0-35vac, use a psu as per your choice.

 

[HIFI0101]

any suggestion for a PSU board for Apex 14?

 

[prasi]

Use whatever you have hifi0101.
Avtech, crc i suggested won't accept a ct. It needs a dual secondary trafo.

 

[avtech]

Thanks Prasi.

The transformers I have were both advertised as centre tap but are actually dual secondary winding so no problem there.

 

[viki_v2]

Hi Katiyar,
None of the items are from offline shops. Most of the items are from an Aliexpress seller who sells genuine parts . And some are from taydaelectronics.

Thank you
Sha

Can you share link of Ali Express dealer.
Thanks

 

[katiyar]

Mr shabusf,

From which shop you buy these electronic components?