SIMPLE AMP

andrewlebon · 20th February 2013, 01:06 PM

Detex Audio 741 ic based low component count NICE SOUND
warm regards
andrew lebon

cats squirrel · 20th February 2013, 03:30 PM

if its the original 741 op amp, this is not suitable for audio, there are much better ones, for little money. Makes one wonder how any designer could use a 741 for audio these days.

Can't see how its a nice sound, have you listened to it?

JMFahey · 20th February 2013, 08:06 PM

Care to share or link the schematic?
Thanks.

wahab · 20th February 2013, 08:52 PM

The advantage of a 741 is that can be swapped by a 5534
that will greatly improve the sound audibly speaking , i guess
that the eventual customer will at least experiment a valuable
and encouraging upgrade that will actualy work.

destroyer X · 20th February 2013, 08:54 PM

My daugther still use it playing guitar.

35 watts RMS at 8 ohms..... aprox. ... and almost 20W at 8 ohms.

Sounds good... stérile as chip amplifiers...but it is compact and simple.

I really do not remember if i have made modifications.... this is simulator..sometime real life we have to adjust something..for instance, the zener current not to overheat.... these details.

Nice toy to build in a weekend.

regards,

Carlos

JMFahey · 21st February 2013, 12:26 AM

I think you must have made something else, because this amp, as is, is terrible.
It has +/-35V rails but the Op Amp can not swing more than 12V peak each way.
You are wasting 20V each side.
It's also overbiased and not compensated, so it will self destroy thermally.
Plus other small details.

Jay · 21st February 2013, 12:33 AM

Quote:

Originally Posted by cats squirrel

if its the original 741 op amp, this is not suitable for audio, there are much better ones, for little money. Makes one wonder how any designer could use a 741 for audio these days.

Can't see how its a nice sound, have you listened to it?

Quote:

Originally Posted by wahab

The advantage of a 741 is that can be swapped by a 5534 that will greatly improve the sound audibly speaking , i guess
that the eventual customer will at least experiment a valuable
and encouraging upgrade that will actualy work.

The nice sound may come from the complete amp or topology, not from the opamp used. CFP amps tend to sound nice, and they are not so stable. You cannot drive an existing CFP with the fastest opamp hoping to get improvement.

Indeed, there is a classic CFP design using a very slow uA741, and it sounds nice. Well, why not show me your favorite simple CFP driven by 5534 or better opamp?

andrewlebon · 21st February 2013, 12:46 AM

pictures dont LIE hottest selling kit now

andrewlebon · 21st February 2013, 01:13 AM

Trying to finish 2sc5200 version with enitter resistors
warm regards
andrew lebon

gannaji · 21st February 2013, 02:43 AM

Dear andrewlobon,
Are the range of Detex Audio products available in India? Can you provide an address or Tel No?
--gannaji

21st February 2013, 02:43 AM	#10
gannaji diyAudio Member Join Date: Jan 2011 Location: Hyderabad	Dear andrewlobon, Are the range of Detex Audio products available in India? Can you provide an address or Tel No? --gannaji __________________ www.samritatrust.org

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20th February 2013, 03:30 PM	#2
cats squirrel diyAudio Member Join Date: Feb 2011 Location: Devon, UK	if its the original 741 op amp, this is not suitable for audio, there are much better ones, for little money. Makes one wonder how any designer could use a 741 for audio these days. Can't see how its a nice sound, have you listened to it?

20th February 2013, 08:06 PM	#3
JMFahey diyAudio Member Join Date: Mar 2009 Location: Buenos Aires - Argentina	Care to share or link the schematic? Thanks.

20th February 2013, 08:52 PM	#4
wahab diyAudio Member Join Date: Nov 2009 Location: algeria/france	The advantage of a 741 is that can be swapped by a 5534 that will greatly improve the sound audibly speaking , i guess that the eventual customer will at least experiment a valuable and encouraging upgrade that will actualy work.

21st February 2013, 12:26 AM	#6
JMFahey diyAudio Member Join Date: Mar 2009 Location: Buenos Aires - Argentina	I think you must have made something else, because this amp, as is, is terrible. It has +/-35V rails but the Op Amp can not swing more than 12V peak each way. You are wasting 20V each side. It's also overbiased and not compensated, so it will self destroy thermally. Plus other small details.