How do I read this scheem for a comp circuit

djn · 13th October 2010, 11:44 PM

Hi All. I am attempting to put of OB comp circuit into my OBs and can't figure out what the triangle is in the Edge program schematic. Here is a screen shot.

Also, if you know the Edge program, how do I determine the R1 ohms? I read through the manual on the website but it did not address it.

planet10 · 13th October 2010, 11:47 PM

The triangle is most often an opamp.

dave

djn · 14th October 2010, 12:05 AM

Hi Dave, there is no mention of an opamp anywhere in the lit, but that was my thought as well.

djn · 14th October 2010, 02:30 PM

Just found out that the triangle is my amp, so the circuit starts at the input of my amp and goes to the output.

planet10 · 14th October 2010, 04:24 PM

That assumes a lot about your amp. You'd be putting an additional feedback loop around the amp with no concern for its input and output impedance. I wouldn't do that. I'd make an active filter using an opamp (or substitute).

dave

djn · 14th October 2010, 09:42 PM

Just got an email back from Svente, the designer of the EDGE program. He wrote:

Ah, ok. Well, this little circuit goes between the preamp and the power amp, it is typically not part of the power amp (even if it could be).

One should also keep in mind that the compensation circuit only takes care of the baffle effects, and that it is common to use drivers with a high Qts for compensation. The driver properties are not at all included in the Edge simulations.

/Svante

Dave you were right about the OpAmp, I just was not use to seeing it in a speaker circuit.

13th October 2010, 11:47 PM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	The triangle is most often an opamp. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

14th October 2010, 04:24 PM	#5
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	That assumes a lot about your amp. You'd be putting an additional feedback loop around the amp with no concern for its input and output impedance. I wouldn't do that. I'd make an active filter using an opamp (or substitute). dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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14th October 2010, 12:05 AM	#3
djn diyAudio Member Join Date: Oct 2004	Hi Dave, there is no mention of an opamp anywhere in the lit, but that was my thought as well.

14th October 2010, 02:30 PM	#4
djn diyAudio Member Join Date: Oct 2004	Just found out that the triangle is my amp, so the circuit starts at the input of my amp and goes to the output.

14th October 2010, 09:42 PM	#6
djn diyAudio Member Join Date: Oct 2004	Just got an email back from Svente, the designer of the EDGE program. He wrote: Ah, ok. Well, this little circuit goes between the preamp and the power amp, it is typically not part of the power amp (even if it could be). One should also keep in mind that the compensation circuit only takes care of the baffle effects, and that it is common to use drivers with a high Qts for compensation. The driver properties are not at all included in the Edge simulations. /Svante Dave you were right about the OpAmp, I just was not use to seeing it in a speaker circuit.

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