YOu can use 2SD669 and 2SB649. http://www.datasheetcatalog.org/datasheet/HitachiSemiconductor/mXrvtwq.pdf
Q
The small power supply shown here will power 2 Nmos200 modules.
Nmos & Nbip series - Quasi's DIY Audio Site
Q
The soft start cct and layout is here: Slow turn on cct - Quasi's DIY Audio Site
Use a relay like this (many brands) for both the soft start and the DC protect ccts.
http://www.fujitsu.com/downloads/MICRO/fcai/relays/vs.pdf
Cheers
Q
Last edited:
YES have remove crowbar and so on
and add Over current protection (look 1703 Quasi posting) + relay Turn on and DC protection
Any complaints for faults ?
Who want PCB gerber files ? ... email me
regards
PCB layout to etch
Hi,
i like the latest posting of the NMOS amplifier good work everyone really good designs i'd like to get a pcb layout i can etch the one on page 365 doesn't seem to have that. I am also going to use the IRFP264 mosfets they seem pretty good and i have a batch of them lying around ready to use so i can't wait to bang one of these amps together and give it a good run. the other question i have is about heat. should a amplifier keep warm or run that way and why does T8 transistor be mounted in the heatsink what the reason behind having to do that. Is there any reason why you can't just put a flag heatsink on it and let it sit on the board all by its lonesome. If you put a fan on the heatsinks and run them every time the amp is on does this run the amplifier to cold. Just a few questions i had about the amp iam looking forward to putting a one of the latest NMOS500 together with the protection circuits on the board will be great to get the pcb layouts to etch thanks. Look forward to reading you guys replys
Hi,
i like the latest posting of the NMOS amplifier good work everyone really good designs i'd like to get a pcb layout i can etch the one on page 365 doesn't seem to have that. I am also going to use the IRFP264 mosfets they seem pretty good and i have a batch of them lying around ready to use so i can't wait to bang one of these amps together and give it a good run. the other question i have is about heat. should a amplifier keep warm or run that way and why does T8 transistor be mounted in the heatsink what the reason behind having to do that. Is there any reason why you can't just put a flag heatsink on it and let it sit on the board all by its lonesome. If you put a fan on the heatsinks and run them every time the amp is on does this run the amplifier to cold. Just a few questions i had about the amp iam looking forward to putting a one of the latest NMOS500 together with the protection circuits on the board will be great to get the pcb layouts to etch thanks. Look forward to reading you guys replys
pcb dimensions of nmos500 and power supply for protection circuits
hi
One other question i had i couldn't find the exact dimension of the nmos500 amplifier pcb board so i can etch the exact size if i decide to do that particular layout design on quasi's site. Another question i was wondering about do most people here if running a 24v fan run it of the same winding or transformer as a preamp is running on or do most people put a seperate small transformer in to run the cooling fans and protection circuits i was mainly curious on the power supply schemes most people are using to run the preamp sections and protection circuits on the most of these power amplifiers that are made once again thanks for your input.
hi
One other question i had i couldn't find the exact dimension of the nmos500 amplifier pcb board so i can etch the exact size if i decide to do that particular layout design on quasi's site. Another question i was wondering about do most people here if running a 24v fan run it of the same winding or transformer as a preamp is running on or do most people put a seperate small transformer in to run the cooling fans and protection circuits i was mainly curious on the power supply schemes most people are using to run the preamp sections and protection circuits on the most of these power amplifiers that are made once again thanks for your input.