Hi Apex,
I am using +/- 42V rail, so I left the BC560C as they are.
I borrowed the big power supply board from my subwoofer with 8x 8200uF filter capacitors and one 25A bridge rectifier per channel to test the AX14.
I have since build two power supply boards with 4x Nichicon 8200uF filter capacitors & 8x On-Semi MUR1520 fast diodes per channel. Surprisingly the AX14 sound better with less filter caps - the amp sound faster & more detailed.
Cheers, Stanley
Some audiophiles think that fast diodes instead bridge rectifier in PSU give better sound to the amp...
Can you post schematics of both PSU, there is some resistors and caps?
Regards
Last edited:
Psu
Hi Apex,
My PSUs has nothing special & I did not have a schmatics for it.
The old subwoofer PSU just use one GBPC2502 rectifier bridge & 8x 8200UF filter capacitors. The capacitors bank are connected as C-R-C-C-C & value for R is 0R22 (5W) & the Zobel is 1R2 plus 470nF.
=-=
I captured the screenshot from KiCad for MUR1520 version here.
D1 to D8 are MUR1520 or any TO-220AB fast diodes
C1 to C8 are 100nF MKT bypass cap for each diode
C11 to C14 are the main filter caps (snap-in up to 35mm dia.)
Zobel is 2R2 plus 470nF MKT cap
4K7 & LED to breed the filter caps.
I used two cheap E-I (0-30V AC) transformers and a toroidal transformer with two secondary windings can also been used.
Cheers, Stanley
Some audiophiles think that fast diodes instead bridge rectifier in PSU give better sound to the amp...
Can you post schematics of both PSU, there is some resistors and caps?
Regards
Hi Apex,
My PSUs has nothing special & I did not have a schmatics for it.
The old subwoofer PSU just use one GBPC2502 rectifier bridge & 8x 8200UF filter capacitors. The capacitors bank are connected as C-R-C-C-C & value for R is 0R22 (5W) & the Zobel is 1R2 plus 470nF.
=-=
I captured the screenshot from KiCad for MUR1520 version here.
D1 to D8 are MUR1520 or any TO-220AB fast diodes
C1 to C8 are 100nF MKT bypass cap for each diode
C11 to C14 are the main filter caps (snap-in up to 35mm dia.)
Zobel is 2R2 plus 470nF MKT cap
4K7 & LED to breed the filter caps.
I used two cheap E-I (0-30V AC) transformers and a toroidal transformer with two secondary windings can also been used.
Cheers, Stanley
Attachments
Hi Apex,
My PSUs has nothing special & I did not have a schmatics for it.
The old subwoofer PSU just use one GBPC2502 rectifier bridge & 8x 8200UF filter capacitors. The capacitors bank are connected as C-R-C-C-C & value for R is 0R22 (5W) & the Zobel is 1R2 plus 470nF.
=-=
I captured the screenshot from KiCad for MUR1520 version here.
D1 to D8 are MUR1520 or any TO-220AB fast diodes
C1 to C8 are 100nF MKT bypass cap for each diode
C11 to C14 are the main filter caps (snap-in up to 35mm dia.)
Zobel is 2R2 plus 470nF MKT cap
4K7 & LED to breed the filter caps.
I used two cheap E-I (0-30V AC) transformers and a toroidal transformer with two secondary windings can also been used.
Cheers, Stanley
Possible difference 0R22/5W in C-R-C-C-C connect is audible...😕
Last edited:
can i use tip35-36 in this schematic ? than suggest improvement.
No, you can use TIP35C/TIP36C (100V) in this schematics with rail voltage+/-45V DC max.
Regards
Attachments
any replacement for mje340 and 350? is this enough to drive a 500watt subwoofer speaker?
I try to use most available parts, there is many replacements for MJE340/MJE350.
BF471/BF472, BF871/BF872...
For 500watt subwoofer speaker is better to use B500.
thanx apex, I'll try this changes in your pcb
🙂🙂🙂
Your schematic is wrong even for MOSFETs (VAS current too low...)
Regards
okay. thanks!
There is also many 2SA/2SC or 2SB/2SD pairs for replace MJEs.
Dear Mile Slavkovic
Can i use this AX-14 for keyboard and guitar
This is what type of amplifier (class)?
can i give +/-48v supply to it
could you please tell me replacement of BC 547 and MJE350
Can i use this AX-14 for keyboard and guitar
This is what type of amplifier (class)?
can i give +/-48v supply to it
could you please tell me replacement of BC 547 and MJE350
Dear Mile Slavkovic
Can i use this AX-14 for keyboard and guitar
This is what type of amplifier (class)?
can i give +/-48v supply to it
could you please tell me replacement of BC 547 and MJE350
Go to thread:
http://www.diyaudio.com/forums/solid-state/167363-mic-line-eq-preamps-4.html
in post #35 you can find amp with PSU and preamp.
Regards
Hi Apex,
As you requested, pics of my NX-14. Will keep you posted on my progress.
Regards,
Macd
When you put amp in to the case remove test resistor for GND (10R), connect GND wire from PSU to input terminals, and don't forget zobel network on speakers terminal.
Regards
RE... NX-14 Completed
Hi Apex,
Not really, was busy over weekend with my son's school project. I will measure voltages tonight and give feedback........see If I can assemble second channel to.....
Regards,
Macd🙄🙄🙄
Hi Macd,
Is there any progress with your NX14?
Regards
Hi Apex,
Not really, was busy over weekend with my son's school project. I will measure voltages tonight and give feedback........see If I can assemble second channel to.....
Regards,
Macd🙄🙄🙄
Hi Apex,
Not really, was busy over weekend with my son's school project. I will measure voltages tonight and give feedback........see If I can assemble second channel to.....
Regards,
Macd🙄🙄🙄
I'm sure your work will be successful.
Regards
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