Bassman sim using opamp?

[spinoza]

I found that circuit fragment:



Which uses a LM386 and seems to be very similar to this:



That uses a J201.

The 2nd one has a "bright" switch, and the other a "bass boost" switch. Since I'm gonna use the circuit mostly for hip-hop and reggae bass playing, that seems like a perfect bass pre-amp to me!

So, is it a good or crazy idea?

Edit: circuit coming up

[spinoza]

My schem:

[aron]

Road runner has been really slow lately, but I would put in the bright switch that the original J201 circuit had. But I'm not sure what you are trying to get. Unless you want to drive a speaker or something, a simple op amp would do. I thought most basses have preamps in them now? In any case, a standard op amp, run at 18V might give you a better preamp.

[spinoza]

My goal is to get a good bass pre-amp that woul sound deep and muffled (with little or no overdrive even at max gain). Do you think this could work?

Edit: the pre-amp will be used as some kind of DI most of the time.

[spinoza]

Update: I've built it. Worked straight away the first time. Will probably fiddle with the cap values a bit before I record sound clips.

[aron]

My goal is to get a good bass pre-amp that woul sound deep and muffled (

I would use a good op amp, run at 18V, put lowpass filter on the end.

[spinoza]

Thanks for the info, I'm gonna try using two 9v batteries.

[wampcat1]

Just wanted to post some comparison info - the 386 circuit you posted and the j201 clipping circuit you posted sound totally different from each other. As you've found, a opamp based circuit will work just fine. As they are drawn here, though, they will sound totally different from each other.

bw

[Dragonfly]

I drew this up for you real quick...should be pretty effective for getting a big fat bass tone....and it'll be easy to build (i'd build on up real quick to test, but i'm not at my home right now...)

AC

[alderbody]

My goal is to get a good bass pre-amp that woul sound deep and muffled (

I would use a good op amp, run at 18V, put lowpass filter on the end.

just a little thread hacking...

could the LM386 based "smash drive" be opreated @18V?
I read the data sheet and only the LM386-N4 is supposed to be capable of handling 18V.
(i have the N1 type and couldn't find the N4)

sorry for the hacking

[spinoza]

Update: It's working fine, but the sound is mediocre at best. I thought it over and I'll probably re-use this circuit and build a modified little gem with it. I add tone stack, hoping that the amp will make up for the gain loss.