5 watts single ended amp

renjiish · 2nd October 2004, 08:34 AM

this circuit i got from internet.does anybody tried this circuit.it is written that it is a 5 watts amp.but it seems to be 14 watts amp.if anybody tried this please give some informayion.
or atleast try to analyse this circuit

tschrama · 2nd October 2004, 09:15 PM

Hi,

Due to the resistive loading this circuit has terrible effeciency... I dunno 5% maybe? But it is minimalistic

What makes you think it is 14 watts instead of 5 watt?

If you want a minimalistic Class A design.... maybe this is something you might like....
http://www.redcircuits.com/Page80.htm

SunRa · 3rd October 2004, 07:19 AM

It says there that it has a 40Hz to 22KHz, -3dB frequency response. Isn't that a litle unlinear?

renjiish · 3rd October 2004, 08:14 AM

hai tschrama
thank you for giving me the circuit.it is looking likea small jlh amp.did you tried this circuit .how it sounds.thd seems to be very high and bandwidth is very small.what is your opinion

tschrama · 3rd October 2004, 10:48 AM

The bandwidth quoted isn't the world, but replace a capacitor here or there and that'll be fixed.. The circuit indeed does look like a JLH 10W Class A amplifier.. being somewhat smaller and even more simple, performances have become a a little worse..

The 5watt that was posted earlie will have similar performance I think... I'll do some sumilations...

renjiish · 3rd October 2004, 12:55 PM

thank you for showing interest in my project.i have one more question,if i use irf 510 with 100 ohm gate resistor instead of bd 439.is it ok,because ihave lot of irf 510 in my hand

tschrama · 3rd October 2004, 12:59 PM

Hi,

That might work... dissipation of each output transistor is about 9 Watts... at 0.7A Iq... I guess it is do-able.. but maybe IRF540 is more suiteble...

tschrama · 3rd October 2004, 01:18 PM

The irf510 has low transductance compared to the irf540, so performace (efficinetie, THD etc) is worse... I just ran a irf540 simmulation and it is comparable to the ZEN project range....

The arangement on the schematic that I linked, is a 'pure' SE' the lower output transistor is allmost a CCS.. it might be more effecient to split the 1Ohm resistor to make it more push-pull

edit
Beware that the Iq is far less stable with IRFs that with the BJT... you need a very stable supply....

maybe if you can tell a bit more about your goal and restrictions, I can help you with a real practical circuit...

renjiish · 3rd October 2004, 02:37 PM

my interest is single ended 5 watts amplifier with available components.i have irf 530's and irf 510's in my stock.so i can go for that .
i want to use that amplifier for my computer.
my speakers are 10 years old celestion 6l

tschrama · 3rd October 2004, 03:40 PM

Great... I am sure you can build something nice with that... I'll be back..

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2nd October 2004, 09:15 PM	#2
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	Hi, Due to the resistive loading this circuit has terrible effeciency... I dunno 5% maybe? But it is minimalistic What makes you think it is 14 watts instead of 5 watt? If you want a minimalistic Class A design.... maybe this is something you might like.... http://www.redcircuits.com/Page80.htm

3rd October 2004, 07:19 AM	#3
SunRa diyAudio Member Join Date: Aug 2004 Location: Romania	It says there that it has a 40Hz to 22KHz, -3dB frequency response. Isn't that a litle unlinear?

3rd October 2004, 08:14 AM	#4
renjiish diyAudio Member Join Date: Aug 2002 Location: United Kingdom	hai tschrama thank you for giving me the circuit.it is looking likea small jlh amp.did you tried this circuit .how it sounds.thd seems to be very high and bandwidth is very small.what is your opinion

3rd October 2004, 10:48 AM	#5
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	The bandwidth quoted isn't the world, but replace a capacitor here or there and that'll be fixed.. The circuit indeed does look like a JLH 10W Class A amplifier.. being somewhat smaller and even more simple, performances have become a a little worse.. The 5watt that was posted earlie will have similar performance I think... I'll do some sumilations...

3rd October 2004, 12:55 PM	#6
renjiish diyAudio Member Join Date: Aug 2002 Location: United Kingdom	thank you for showing interest in my project.i have one more question,if i use irf 510 with 100 ohm gate resistor instead of bd 439.is it ok,because ihave lot of irf 510 in my hand

3rd October 2004, 12:59 PM	#7
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	Hi, That might work... dissipation of each output transistor is about 9 Watts... at 0.7A Iq... I guess it is do-able.. but maybe IRF540 is more suiteble...

3rd October 2004, 01:18 PM	#8
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	The irf510 has low transductance compared to the irf540, so performace (efficinetie, THD etc) is worse... I just ran a irf540 simmulation and it is comparable to the ZEN project range.... The arangement on the schematic that I linked, is a 'pure' SE' the lower output transistor is allmost a CCS.. it might be more effecient to split the 1Ohm resistor to make it more push-pull edit Beware that the Iq is far less stable with IRFs that with the BJT... you need a very stable supply.... maybe if you can tell a bit more about your goal and restrictions, I can help you with a real practical circuit...

3rd October 2004, 02:37 PM	#9
renjiish diyAudio Member Join Date: Aug 2002 Location: United Kingdom	my interest is single ended 5 watts amplifier with available components.i have irf 530's and irf 510's in my stock.so i can go for that . i want to use that amplifier for my computer. my speakers are 10 years old celestion 6l

3rd October 2004, 03:40 PM	#10
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	Great... I am sure you can build something nice with that... I'll be back..

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