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NX14
Suggestion from mr. Mile
Mosfet under heatsink, simple, & solid result
Thanx.
Regards
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Suggestion from mr. Mile
Mosfet under heatsink, simple, & solid result
Thanx.
Regards
Finished NX-14 with zobel
Thanks
Regards
are the driver - transistors connected right, or they have reversed pin-out in this case? i don't have schematic or layout now,but i wonder...
R3 10K in schematic is labeled 22K on layout . Those who downloaded sprint layout file can edit it.
Corrected pdf files.
Could you post schematic for PROT clip signal power circuit?
R1-1k
R2,R11-22k
R4,R6,R7,R8,R16-560R
R5,R10,R14,R15,R17,R18,R19-220R
R9,R12,R13-100k
R20,R21,R22,R23-0R33 5W
C1-10uF/25V ELKO
C2-100pF KER
C3-1500pF KER
C4,C5,C11,C12-2,2uF/63V ELKO
C6-100uF/25V ELKO
C7-330pF KER
C9,C10-220pF KER
C8-100nF MKS
D1,D2,D3-1N4148
Q1,Q2,Q3-2N5401
Q4,Q5,Q7-BC547
Q6-BC557
Q8-MJE340
Q9-MJE350
Q10-BD139
Q11,Q12-BDW84D
PCB size:62,5x82,5mm
Q13,Q14-BDW83D
Dear Mile sir,
what can be used an alternative to BDW83D and BDW84D in the kelvin amp? And also alternatives for Q1, Q4, Q6, Q8, Q9 and Q10?
regards
prasi
Dear Mile sir,
what can be used an alternative to BDW83D and BDW84D in the kelvin amp? And also alternatives for Q1, Q4, Q6, Q8, Q9 and Q10?
regards
prasi
Use TIP147 TIP147 or similar darlingtons.
Schematic was posted by Miles some were in 100w-ultimate-fidelity-amplifier thread, I have forgot where protect schematic is on my PC. AX-20 schematic will help, Miles told this protect can be added to any amplifier.Could you post schematic for PROT clip signal power circuit?
Got your PM, I have not tested this amplifier myself, thole wanted to make this amp I send him sprint files. You can PM thole regarding NX-400. I'll probably test next month.So did anybody got the NX400 with 3pair output working without problems. Can IRFP460 fets be used ?
Sure you can use IRFP460, IRFP450 or any other mosfet.
Attachments
NX14 Reverse Mosfet
This my laout PCB using ex processor heatsink.
Thanks
Regards
This my laout PCB using ex processor heatsink.
Thanks
Regards
Attachments
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For all aplication especialy for subwoofer I recomend you Kelvin amplifier without VI limiter. You also need active X-over for subwoofer.
Hi Mr. Mile,
I was planning to build the Kelvin Amp. However I observed one ambiguity in schematic, PCB layout and actual photograph of the amp posted by you.
1. capacitor 104 (100nF) connecting signal ground and supply ground present on layout and not in schematic and unconnected in the amp photo. should use this capacitor or not?
what are the alternatives for MJE 340 and MJE 350?
appreciate your reply
reg
prasi
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For all aplication especialy for subwoofer I recomend you Kelvin amplifier without VI limiter. You also need active X-over for subwoofer.
Dear Mr. Mile,
I noted one more discrepancy in the schematic.
R15 is written twice in the schematic...pl see attached image.
Attachments
@Vrystaat
Silkscreen for NX-400
What about sharing PCB layout?
Hi Prasi, C6 polarity and D1 are reverse on schematic, place components as shown in layout. As you can see this IPS is used in other Apex amplifiers NX-14, AX-14, AX-20 etc.HI Mr. Mile one more observation,
C6 polarity is reversed on the layout. which one is correct? I dont want to blow things. hence pl suggest whether schematic is correct or the layout!!
Reg
MJE 340 and MJE 350 are common in India. Which city do you live?
2SC4793, 2SA1837 or other TO220 devices can be used with 180° orientation on pcb.
It's difficult to recommend alternatives because I don't know what's available locally to you. Look at first list and last list on posted transistors.pdf file then check at your local electronic component shop any of those available. Also Vceo must 100v or greater.
With TIP142 and TIP147 maximum voltage will be +/-45v for this amp and output will be around 140W-150W @4ohm.
Regards,
Sonal
Attachments
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