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Old 20th February 2013, 01:06 PM   #1
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Default SIMPLE AMP

Detex Audio 741 ic based low component count NICE SOUND
warm regards
andrew lebon
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Old 20th February 2013, 03:30 PM   #2
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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?
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Old 20th February 2013, 08:06 PM   #3
JMFahey is offline JMFahey  Argentina
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Care to share or link the schematic?
Thanks.
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Old 20th February 2013, 08:52 PM   #4
wahab is offline wahab  Algeria
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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.
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Old 20th February 2013, 08:54 PM   #5
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Default Nice toy, i have made one alike few years ago

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
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Old 21st February 2013, 12:26 AM   #6
JMFahey is offline JMFahey  Argentina
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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.
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Old 21st February 2013, 12:33 AM   #7
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by cats squirrel View Post
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 View Post
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?
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Old 21st February 2013, 12:46 AM   #8
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Default simple amp

pictures dont LIE hottest selling kit now
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Old 21st February 2013, 01:13 AM   #9
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Default HIGH POWER VERSION

Trying to finish 2sc5200 version with enitter resistors
warm regards
andrew lebon
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Old 21st February 2013, 02:43 AM   #10
gannaji is offline gannaji  India
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Dear andrewlobon,
Are the range of Detex Audio products available in India? Can you provide an address or Tel No?
--gannaji
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