Rod Elliot P37?

roger-k · 27th September 2006, 11:10 AM

I have try to simulate ESP's P37.
http://sound.westhost.com/project37.htm

What I find out was: The preamp is inverted.
Should I do a inverted stage on the input or the output
so the preamp does not invert the signal?
Or it doesn't matterif if it's inverted?
(The main amp is not inverted)

SpittinLLama · 27th September 2006, 05:13 PM

Doesn't matter if inverted. Only matters if channels are inverter relative to each other. As long as all are inverted or not or any combination as long as all channels are the same phase by the output.

-SL

Tube_Dude · 27th September 2006, 06:04 PM

Quote:

Originally posted by roger-k
I have try to simulate ESP's P37.
http://sound.westhost.com/project37.htm

What I find out was: The preamp is inverted.

Hi Roger

The project of preamp ESP P37 is no inverting ...

roger-k · 27th September 2006, 08:38 PM

hi.

Are you one hundred percent sure?

I think Q1 inverts the signal because Q1 has about +15V on emitter and the collector controls the base on Q3, which is the ouput transistor.

Tim__x · 27th September 2006, 10:14 PM

He's one hundred percent sure. Look at the orientation of Q3, it's common emitter, not emitter follower.

If your simulation actually shows it as inverting, you've made a mistake in drafting the schematic. Or it doesn't actually show that, and you're just looking at the wrong data.

roger-k · 28th September 2006, 12:48 AM

I don't know why it's inverted.......

Any suggestion?

Nordic · 28th September 2006, 12:53 AM

Hi, what software is that?

Leolabs · 28th September 2006, 02:20 AM

Quote:

Originally posted by Nordic
Hi, what software is that?

Multisim.

roger-k · 28th September 2006, 06:14 AM

The software is Electronics Workbench
http://www.electronicsworkbench.com/

Nordic · 28th September 2006, 03:54 PM

thanks, downloading....

27th September 2006, 11:10 AM	#1
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	Rod Elliot P37? I have try to simulate ESP's P37. http://sound.westhost.com/project37.htm What I find out was: The preamp is inverted. Should I do a inverted stage on the input or the output so the preamp does not invert the signal? Or it doesn't matterif if it's inverted? (The main amp is not inverted) __________________ Roger

27th September 2006, 08:38 PM	#4
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	hi. Are you one hundred percent sure? I think Q1 inverts the signal because Q1 has about +15V on emitter and the collector controls the base on Q3, which is the ouput transistor. __________________ Roger

28th September 2006, 06:14 AM	#9
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	The software is Electronics Workbench http://www.electronicsworkbench.com/ __________________ Roger

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27th September 2006, 05:13 PM	#2
SpittinLLama diyAudio Member Join Date: Apr 2005 Location: In the Wild, Wild West	Doesn't matter if inverted. Only matters if channels are inverter relative to each other. As long as all are inverted or not or any combination as long as all channels are the same phase by the output. -SL

27th September 2006, 10:14 PM	#5
Tim__x diyAudio Member Join Date: Jun 2004 Location: Edmonton area, Alberta	He's one hundred percent sure. Look at the orientation of Q3, it's common emitter, not emitter follower. If your simulation actually shows it as inverting, you've made a mistake in drafting the schematic. Or it doesn't actually show that, and you're just looking at the wrong data.

28th September 2006, 12:53 AM	#7
Nordic diyAudio Member Join Date: Sep 2005	Hi, what software is that?

28th September 2006, 03:54 PM	#10
Nordic diyAudio Member Join Date: Sep 2005	thanks, downloading....

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