multisim grr

jenks · 18th March 2008, 09:18 PM

Hi, Jenks here.

I've been trying desperately to get a circuit (bass preamp) simulating in multisim for weeks, unto no avail! I was wondering if there is anybody out there whom is rather good at multisim and is willing to assist a confused (

ha) student in his bass preamp/overdrive/D.I endeavour!

Cheers.

djk · 19th March 2008, 09:10 AM

That circuit require a plus and a minus supply.

While the spec sheet says the opamp may be driven from a single 5V supply, your circuit requires a ± supply.

jenks · 19th March 2008, 12:52 PM

Hi DJK! Thanks for your reply. I've tried connecting the op-amp to both positive and negative terminals of a battery from both +ive & -ive terminals of the op-amp but that doesn't seem to work either! grr.

Any advice on which op-amps to use with unbalanced audio and how to power them would be greatly appreciated!

Thanks.

jenks · 19th March 2008, 03:53 PM

Alright, I've got two OPA627 op-amps in there now and they're correctly powered but when I alter the potentiometers the gain across the entire frequency response of the input signal alters as opposed to being frequency specific like it should! Grr...

Any ideas? (see attached for schematic)

jenks · 19th March 2008, 04:57 PM

Forget I said anything! i have it working now :-)

19th March 2008, 09:10 AM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	That circuit require a plus and a minus supply. While the spec sheet says the opamp may be driven from a single 5V supply, your circuit requires a ± supply. __________________ Candidates for the Darwin Award should not read this author.

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19th March 2008, 12:52 PM	#3
jenks diyAudio Member Join Date: Mar 2008	Hi DJK! Thanks for your reply. I've tried connecting the op-amp to both positive and negative terminals of a battery from both +ive & -ive terminals of the op-amp but that doesn't seem to work either! grr. Any advice on which op-amps to use with unbalanced audio and how to power them would be greatly appreciated! Thanks.

19th March 2008, 04:57 PM	#5
jenks diyAudio Member Join Date: Mar 2008	Forget I said anything! i have it working now :-)

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