60 w power amplifier

[turnA_zpoint]

Hi a sample

Hi Meledath !
It would be greatly appreciated if it serves as a reference.

Though it doesn't understand whether to meet the satisfaction
It is an amplifier of about 60W for which my amplifier just used the operational amplifier and MOSFET. Data is not taken whether it is a low swerve. (Because 0.1% or less cannot be measured because there is no enough measurement environment. )

http://www2.plala.or.jp/puthoff/gazou_mk2/amp_WD_MS010_Mk2.GIF
( Now tuning:R21,R22 are 220ohm, C7 is 4.7pF)

This circuit is not so acknowledged, and there seems variously to be opinion.

This is a circuit that uses the current feedback together with the voltage feedback.


Regards

 

[meledath]

hi,

the parts are not very common here. can any one prescribe the substitutes?

 

[turnA_zpoint]

some infomations

Hi
Some info about substitution.

I had tested below parts ,and it had to be OK
Q3,Q4,Q5,Q6,Q13,Q14 :2SA1145/2SC2705
Q9,Q10,Q11,Q12 :2SA1015/2SC1815 (but supply VOl MAX +-24V）

I had understood below ,
About Q15,Q16,Q19,Q20 and above Q13,Q14
cob is important,so useing nearly 2.5p(standard)
If to use large cob,I guess it may be need to mend phase compensation and
need to mend R35,R36 to large number about 470ohm-1Kohm.
And may be -3dB point of freq responce must be down.
(now 700KHz 8ohm load at 1W)

Regards

 

[richie00boy]

A bit complex for a beginner amp in my opinion.

 

[turnA_zpoint]

OK!

Hi
OK

So, other info,

Though, I do not know the sound because I have not made this one.
PDF file from OPAmp and MOS FET KIT (I am not parties concerned in the shop. ) of one of JAPAN shop.

It is not 60W......(Postscript)

Kit Top page
http://pure.kyohritsu.com/3110f.html

Manual (at P44 the circuit is here, but size is large)
http://www.technobase.jp/eclib/WPure/MANUAL/wp3110f.pdf

Shop top page
http://eleshop.jp/shop/default.aspx

I think this circuit is not so complex for a beginner.

(Other info)
http://www2s.biglobe.ne.jp/~NAOTO/acs/analog/nonfbamp.htm
http://www7b.biglobe.ne.jp/~kochan/workshop/analog/fetamp.htm

Regards

 

[AndrewT]

the parts are not very common here. can any one prescribe the substitutes?

no one can suggest local source substitutes if you choose to keep your location secret.

 

[meledath]

my location INDIA.

 

[jaycee]

What kind of parts can you get ? You seem to want MOSFET, im guessing the MOSFET types you are looking at are the vertical type (IRFP240 etc) and these are cheap, and that is why you want to use these.

 

[meledath]

i need some matched pair transistor module like ssm2220 , ssm2210 and power transistors like bd 911 , bd912, 2sk 1943

ic's like op07,ne5532 , ad712 etc.

 

[Bone]

Have you looked at the Citation 12 MOSFET amplifier on the Pass Labs Forum/site. This will give you up to 75 watts.

Tony.

 

[audioholik]

how about this one? is this good circuit and worth to try?

 

[hcbonfim]

My vote is for Symasym, sounds great,

http://www.lf-pro.net/mbittner/Sym5_Webpage/symasym5_3.html


best regards

hcbonfim

 

[ostripper]

I vote for the symasym topology (sounds even better with a triple OPS) , but the one above deserves investigation/simulation.

It .. (the amp posted by audioholic) is very unique. It seems to be a boosted /ultra bias voltage amp driven by a cascoded balanced input.
I have seen this in preamps ,http://www.triadaudio.net/Triad_Audio/Downloads_files/Ultra%20%20Biasing%20Boost%20with%20Enhanced%20Current%20Mirrors.pdf
but never quite like this (as a power amp).
OS