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Old 20th December 2005, 10:31 AM   #1
murphy is offline murphy  Germany
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Exclamation DIY-AMP <ZAS> Low THD & IM high bandwith

Is someone interessed in building an fast amplifier with very high bandwith and really low distortion (THD and IM) at moderable costs ?

This amp is based on real measurements , it is no an result of computer simulations !!!

Click here for more information
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Old 20th December 2005, 11:31 AM   #2
SSassen is offline SSassen  Netherlands
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Well, looks to be a decent amplifier, how about you post the full schematic? As component selection is what usually makes or brakes a design.

Best regards,

Sander Sassen
http://www.hardwareanalysis.com
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Old 20th December 2005, 04:02 PM   #3
murphy is offline murphy  Germany
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Default full schematic

I see no problem to post the full schematic of my amp. the amplifier topology is not new, i build the first prototyps in 1990 with the good old NE5534A operational amplifier. Using an R&S audio-analyser in the last 2 years, I optimized distortion and bandwith by changing some values and placing two additional current mirros. i also spent a lot of time and money with secondary problems like qiescent current stability and semiconductor death by oszillation.
For best results, a good pcb- and power supply design is very important. i think i found it.....

FEEDBACK WELCOME !!
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Old 20th December 2005, 04:40 PM   #4
edl is offline edl  Hungary
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I had a 200W PA design, with the topology something like that.
I had never build my design... Maybe I will...

Regards,

PS:: Schema of the last version attached.
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Old 20th December 2005, 04:53 PM   #5
jcx is offline jcx  United States
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Default Re: DIY-AMP <ZAS> Low THD & IM high bandwith

Quote:
Originally posted by murphy
Is someone interessed in building an fast amplifier with very high bandwith and really low distortion (THD and IM) at moderable costs ?
apparently not as many people as you might think


Quote:

This amp is based on real measurements , it is no an result of computer simulations !!!
of course not, few op amp macromodels get supply terminal currents right - you can find my comments on the ad8610 model in another thread
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Old 20th December 2005, 05:49 PM   #6
SSassen is offline SSassen  Netherlands
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Murphy,

Thanks, looks very nice. Would you mind sending me a brief email at ssassen(at)hardwareanalysis(dot)com? I'd love to know more and discuss the design with you and unfortunately you don't have email switched on in your profile.

Best regards,

Sander Sassen
http://www.hardwareanalysis.com
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Old 21st December 2005, 12:52 PM   #7
djk is offline djk
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edl , I like your design.

The TL071 will suffer phase reversal when the amplifier is driven into clipping. Newer opamps generally don't do this.
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Old 21st December 2005, 04:03 PM   #8
edl is offline edl  Hungary
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Quote:
Originally posted by djk
edl , I like your design.

The TL071 will suffer phase reversal when the amplifier is driven into clipping. Newer opamps generally don't do this.
Hello,

Thanks!
You're right about the OPAMP.
In the prototype I wanted to use NE5534, with about 22-33pF compensation. (In the schematic I forgot to change the TL072 to NE5534...)
There is one more "fault" in my drawing, a paralel RC-network is mising in the output of the OPAMP.

I will attach the new schema!

Regards,

(Hey everybody, if there is indication of interest about my design, I assemble a prototype! I think it would be adequate as HIFI-amp, not only as PA-amp.)
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Old 21st December 2005, 05:22 PM   #9
edl is offline edl  Hungary
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Updated schema atteched.

The design is only an idea, I've only simulated it in my head and with paper+pencil, no software used...

Murphy, sorry for using your thread, a new one will be opened in matter of interest.
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Old 21st December 2005, 08:19 PM   #10
edl is offline edl  Hungary
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Something like this...

(About caps: "F" means foil, "K" means ceramic, "E" means elko, "BPE" means bipolar elko. Of course I suggest to use foil types instead of the creamics too, but they are not easy to get in every electro-shop here...)
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