opa548/opa549 gainclone amp

kozak · 7th September 2004, 04:07 PM

hi everybody

I just got some opa 548 and opa549 from TI; I would like to make a small amplifier with these these chips as they seems to be quite good.

As anyone tried this schematic:
http://focus.ti.com/lit/an/sboa082/sboa082.pdf

else I would like to know what type of power supply to make (size of the transfo, size ofthe capacitors....)

thanks

mandat · 7th September 2004, 08:07 PM

Peter Daniel has compared gainclones with OPA549 and LM3875. Quality was approx. the same but OPA gives more "normal sounding", more hi-fi, while LM produces more "magic".
At last he advices LM3875 for gainclone.

DSP_Geek · 7th September 2004, 08:19 PM

Quote:

Originally posted by kozak
hi everybody

I just got some opa 548 and opa549 from TI; I would like to make a small amplifier with these these chips as they seems to be quite good.

As anyone tried this schematic:
http://focus.ti.com/lit/an/sboa082/sboa082.pdf

[...]

thanks

Look out for figure 3: the + and - opamp inputs are reversed.

soundNERD · 8th September 2004, 03:01 AM

ahhh i hate acrobat...so slow

anyway, I like using national's BPA100 circuit with he 549. About 150-175W output.

kozak · 8th September 2004, 03:12 AM

well, I think I will give a try tomorrow at the university with the schematic from TI.
For now I will use a lab power supply and think about the "real" power supply after.

7th September 2004, 04:07 PM	#1
kozak diyAudio Member Join Date: Jan 2004 Location: edinburgh	opa548/opa549 gainclone amp hi everybody I just got some opa 548 and opa549 from TI; I would like to make a small amplifier with these these chips as they seems to be quite good. As anyone tried this schematic: http://focus.ti.com/lit/an/sboa082/sboa082.pdf else I would like to know what type of power supply to make (size of the transfo, size ofthe capacitors....) thanks __________________ without music, life would be an error Nietzsche

8th September 2004, 03:12 AM	#5
kozak diyAudio Member Join Date: Jan 2004 Location: edinburgh	well, I think I will give a try tomorrow at the university with the schematic from TI. For now I will use a lab power supply and think about the "real" power supply after. __________________ without music, life would be an error Nietzsche

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7th September 2004, 08:07 PM	#2
mandat diyAudio Member Join Date: Oct 2003 Location: Gliwice	Peter Daniel has compared gainclones with OPA549 and LM3875. Quality was approx. the same but OPA gives more "normal sounding", more hi-fi, while LM produces more "magic". At last he advices LM3875 for gainclone.

8th September 2004, 03:01 AM	#4
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	ahhh i hate acrobat...so slow anyway, I like using national's BPA100 circuit with he 549. About 150-175W output.

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