2 x 15W rms Audio Amp for small speakers - diyAudio
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Old 23rd November 2012, 12:16 PM   #1
maouna is offline maouna  Greece
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Default 2 x 15W rms Audio Amp for small speakers

i have 2 2 way speakers for laptop and i want to build a discrete amplifier for these using tip41-tip42, 2n5551-2n5401,bc549-550. any schematic in mind?
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Old 23rd November 2012, 01:05 PM   #2
Bigun is offline Bigun  Canada
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I'm not familiar with all those devices, but you could look at something like the DX amplifier with 27V power rails.

Greg's Web Site

[I did something similar here: TGM Amplifier ? ]
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Old 23rd November 2012, 02:29 PM   #3
tinitus is offline tinitus  Europe
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isn't 15watt too low for classAB anyway ?
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Old 23rd November 2012, 04:14 PM   #4
knutn is offline knutn  Norway
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Maybe you should try the JLH Class A amp?
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Old 23rd November 2012, 04:47 PM   #5
maouna is offline maouna  Greece
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class A will create much heat and there will be the need for big heatsinks.i dont want to use ic's.I would like something with descrete components.
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Old 23rd November 2012, 04:49 PM   #6
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Default 15 watt amp

Quote:
Originally Posted by tinitus View Post
isn't 15watt too low for classAB anyway ?
Tinitus Iremember the days when a 10 watt amp could be heard for two miles from the source on a farm! Fifty years ago we were happy with 5 watts/channel class A with a EL84 output tube. 15 watts with two in push pull fed a large Railway station with sound. So if he need it for his office or home with his computer then I think 15 watts class a/b will be ample! THIS IS WHY A LOT OF US HAVE TINNITUS AND ARE HARD OF HEARING? (pun intended)
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Old 23rd November 2012, 05:19 PM   #7
jaycee is offline jaycee  United Kingdom
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You can do it with a pretty standard Lin/Blameless type topology.. powered from 18V rails or so. Use your TIP41/42 as the output transistors, and 2N5401/2N5551 for everything else.
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Old 23rd November 2012, 05:35 PM   #8
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Default This is really interesting....Class A amplifiers seems to play louder

It is non sense, but 10 watts in class A plays very loud.

Please folks, i cannot understand because i am not addicted nor skilled with the stuff, why this happens.

I have perceived that when i have increased the Dx Super A to 700mA per rail quiescent current.... i found it louder.... really louder than another amplifier playing almost same level.... say.... watching in the waveform it looks the same..but the Class A was louder while listening.

Thid does not make sense to me.... can you explain...please

regards,

Carlos
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Last edited by destroyer X; 23rd November 2012 at 05:40 PM.
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Old 23rd November 2012, 05:36 PM   #9
lineup is offline lineup  Sweden
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Quote:
Originally Posted by jaycee View Post
You can do it with a pretty standard Lin/Blameless type topology.. powered from 18V rails or so. Use your TIP41/42 as the output transistors, and 2N5401/2N5551 for everything else.
This is a blameless using those transistors you mention.
The power supply should use a transformer 2x15VAC, which will give like 20-21 VDC rails.
I have tested with SPICE. It should work.
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Old 23rd November 2012, 06:31 PM   #10
maouna is offline maouna  Greece
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I think tha the ideal for me would be jean hiraga's ''le monstre'' class A 8 watt,as described in other threads here in the forum and here JEAN HIRAGA - Le Monstre Amplifier PCB ,on monday i m going to have two speakers 7 watt rms/4ohm rated each like the ones in the picture. I dont know if the result willl be remarkable but maybe it worths giving it a try...
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Last edited by maouna; 23rd November 2012 at 06:34 PM.
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