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Old 18th March 2008, 10:18 PM   #1
jenks is offline jenks  United Kingdom
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Angry multisim grr

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.
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Old 19th March 2008, 10:10 AM   #2
djk is offline djk
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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.
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Old 19th March 2008, 01:52 PM   #3
jenks is offline jenks  United Kingdom
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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.
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Old 19th March 2008, 04:53 PM   #4
jenks is offline jenks  United Kingdom
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Default multisim is a pain!

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)
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Old 19th March 2008, 05:57 PM   #5
jenks is offline jenks  United Kingdom
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Forget I said anything! i have it working now :-)
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