nice 10W mosfet class-a amp circuit

DarkHorse · 27th September 2005, 04:38 AM

hi:

I got the original amp circuit here:
http://www.redcircuits.com/Page80.htm
it is BJT output device,I think mosfet's would be more suitable as output devices here,so I design this 10W(RMS) class-a amp:

Amblifier · 27th September 2005, 11:21 AM

Hi Darkhorse,

Nice BJT to FET "conversion". Are you planning to build this amplifier? The only thing i dont like about this 2 stage amplifiers is the low OL Gain. I dont say they are bad, its just my feeling.
Maybe it is possible to replace R5 with a current source so you can get the maximum gain out of the first stage.

Greetings

tlf9999 · 27th September 2005, 11:26 AM

this is effectively the "ultra-linear pair" I talked about in another thread, with an Aleph-styled CCS load.

If you really like it, you should take a look at the PLH. Much simpler and affords you a lot of flexibility.

DarkHorse · 28th September 2005, 04:24 AM

yes,I want to build one channel to examinate it,I think it will sounds good and more likes an valve tube amplifier^@^

it works sames to JLH mos version(or PLH)...but it is class-a opertions.so it sounds more lovly I think!

regards
WINCO

DarkHorse · 25th November 2005, 06:46 AM

hi,all friends in this world:
as I read the thread "My beloved amp" here:
My beloved amp
my emotion isn't even...at recent days,I builded one channel amp which circuit is designed by myself...it's good things,I want to share the circuit with all audio DIYERs in this world,enjoy!

regards!
WINCO

Upupa Epops · 25th November 2005, 07:04 AM

WINCO, do you mean, that " Starway to Heaven " lead only by simplest connection ?

DarkHorse · 25th November 2005, 07:17 AM

dear Upupa Epops:
my friend,don't look down this simple amp,I have builded one channel to examin it's capability.it works good,out of my suppose,you can smell out "hi-fi" from this amp...

enjoy!
WINCO

Upupa Epops · 25th November 2005, 07:30 AM

All signals, which will be bellow cca 46 dB from full level, will be not hearable, 'cos will be bellow distortion... It's not " heaven"...

DarkHorse · 25th November 2005, 07:42 AM

Quote:

Originally posted by Upupa Epops
All signals, which will be bellow cca 46 dB from full level, will be not hearable, 'cos will be bellow distortion... It's not " heaven"...

"cca"?
"'cos"?
what does it mean?
sorry for my woodheard...

Upupa Epops · 25th November 2005, 07:45 AM

Cca = approximately
'cos = because

28th September 2005, 04:24 AM	#4
DarkHorse diyAudio Member Join Date: Jan 2005 Location: GuangDong	Thank you,my friends... yes,I want to build one channel to examinate it,I think it will sounds good and more likes an valve tube amplifier^@^ it works sames to JLH mos version(or PLH)...but it is class-a opertions.so it sounds more lovly I think! regards WINCO

25th November 2005, 07:17 AM	#7
DarkHorse diyAudio Member Join Date: Jan 2005 Location: GuangDong	haha... dear Upupa Epops: my friend,don't look down this simple amp,I have builded one channel to examin it's capability.it works good,out of my suppose,you can smell out "hi-fi" from this amp... enjoy! WINCO

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Very nice sounding chipamp-driven working class A amp	ionomolo	Chip Amps	66	29th March 2009 12:03 AM
Class Mosfet power amplifier circuit	Agus Widarto	Pass Labs	16	18th February 2008 04:06 PM
Nice MOSFETs for class D from IR (or how they try to impose us the DirectFet thrash)	Eva	Class D	28	11th December 2007 09:37 PM
??nice 20-30w class a amp solid st. project?	elviukai	Parts	10	10th June 2003 11:40 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

27th September 2005, 11:21 AM	#2
Amblifier diyAudio Member Join Date: May 2005 Location: -	Hi Darkhorse, Nice BJT to FET "conversion". Are you planning to build this amplifier? The only thing i dont like about this 2 stage amplifiers is the low OL Gain. I dont say they are bad, its just my feeling. Maybe it is possible to replace R5 with a current source so you can get the maximum gain out of the first stage. Greetings

27th September 2005, 11:26 AM	#3
tlf9999 Account Disabled Join Date: May 2005 Location: none	this is effectively the "ultra-linear pair" I talked about in another thread, with an Aleph-styled CCS load. If you really like it, you should take a look at the PLH. Much simpler and affords you a lot of flexibility.

25th November 2005, 07:04 AM	#6
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	WINCO, do you mean, that " Starway to Heaven " lead only by simplest connection ?

25th November 2005, 07:30 AM	#8
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	All signals, which will be bellow cca 46 dB from full level, will be not hearable, 'cos will be bellow distortion... It's not " heaven"...

25th November 2005, 07:45 AM	#10
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Cca = approximately 'cos = because

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)