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.
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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
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
No, you can use TIP35C/TIP36C (100V) in this schematics with rail voltage+/-45V DC max.
Regards
Attachments
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
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
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 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