Celestion V30 simulator

[ech0es]

maybe we should add a max1044 to have a -V and +V:

http://www.geofex.com/circuits/+9_to_-9.htm

[fixr1984]

maybe we should add a max1044 to have a -V and +V:

http://www.geofex.com/circuits/+9_to_-9.htm

That would work if you can get away with using 9v.
I believe the max1044 can only take 10.0v max on the input
before frying. Looking at the schem we need 15v.

[ech0es]

according with the TL074 datasheet, it can work at 9v

[fixr1984]

What about using something like this? Same concept as the max1044 just with parts that
everyone should have lying around.
You would have to use a 18v or bigger wall wart to get the necessary volts but
I think it should work and be easy to incorporate into the layout.

[DougH]

With some selective DC blocking caps you could make it work off of a 9v supply. You need a divider to create Vref, and well, you should know the drill by now...

[dschwartz]

i´m not sure if using this with line level will work as nice as with the 25W 8Ohm res.

[ech0es]

http://www.datasheetcatalog.org/datasheet/SGSThomsonMicroelectronics/mXvwqq.pdf

18v is the maximum voltage

If you look at the page 5, you'll see that it can work at 9v.

Or use three max 1044:
One for the  -V and the +V, and two more to convert into +/- 15v




But, in my opinion it's too complex just for convert the voltage if this circuits works at 9v.

[dschwartz]

http://www.datasheetcatalog.org/datasheet/SGSThomsonMicroelectronics/mXvwqq.pdf

18v is the maximum voltage

If you look at the page 5, you'll see that it can work at 9v.

Or use three max 1044:
One for the  -V and the +V, and two more to convert into +/- 15v


Echoes, the issue is not if it can work with 9 volts.. all opamps work at 9 volts or even less.. the issue here is if with miserly 9 volts, this configuration will sound fine, with enough headroom (which is related with the voltage supply)..
i´m pretty sure if you use it connected to the speaker out of an amp, 9V is definetly not enough to handle the wide voltage swings

other thing to consider is that with a 25W resistor, you should not use more than a 25W power amp.. and for more power, you may use several 10W resistors in parallel..
for example, 8 10W, 64 Ohms resistors in parallel are equivalent to an  8 Ohm, 80W resistor..

But, in my opinion it's too complex just for convert the voltage if this circuits works at 9v.

[ech0es]

Echoes, the issue is not if it can work with 9 volts.. all opamps work at 9 volts or even less.. the issue here is if with miserly 9 volts, this configuration will sound fine, with enough headroom (which is related with the voltage supply)..
i´m pretty sure if you use it connected to the speaker out of an amp, 9V is definetly not enough to handle the wide voltage swings

other thing to consider is that with a 25W resistor, you should not use more than a 25W power amp.. and for more power, you may use several 10W resistors in parallel..
for example, 8 10W, 64 Ohms resistors in parallel are equivalent to an  8 Ohm, 80W resistor..

Forget the 25w resistor, i want to be able to plug this circuit to an effect pedal (amp simulator), this resistor is useless.
And we will know if this pedal sounds fine with 9v just by trying it.

The goal of this circuit is not to be plugged to an amp (simulate a V30 and after plugging it to an amp, what is the benefit ?!)
No, the goal is to plug it into a PC, a mixer or a recorder.

[modsquad]

So instead of arguing about it...breadboard the darn thing and see if it works.  You can always swap and delete components.   That's what the breadboard is for.

[Yazoo]

I've just built the Celestion speaker simulator and it's definitely worth the build. It's nice and clear and there is good separation between the strings. It's running on a 15v bipolar supply as recommended.  I'm using it on the line out from a Marshall 20/20 power amp.

I actually managed to build this from parts I had in stock, probably the only time I've ever managed to do this.  You know how you decide to build something and think "it will only cost a couple of quid" then you end up having to put an order in for just a couple of parts and it finishes up costing £15 by the time you pay postage. The only substitution I made was using a 22 N capacitor instead of the 20 N cap specified.

[fixr1984]

Any chance you have a verified layout you would share?

[km-r]

i will try my hands on a version of a layout...

btw, where did you come accross this circuit? pretty neat design and clips!
id like to read more about this because i want to build a cab sim...
so its quite a dilemma between the marshall xlr out and this...

any info what this simulator is simulating? celestion V30 in what format? 412 212?

no experience with V30, sorry...

[frank_p]

I wonder what is the software he use for the frequency responce to pink noise.  Anybody knows ?

[km-r]

i think he used AUDACITY [of hope]...
isnt that a sound recording/editing software?

i will verify the freq response with simetrix when i get home...

[Yazoo]

This is my stripboard layout for the simulator. My layouts always end up oblong shaped despite me trying to get them as square as possible. I didn't have a 1.5 N capacitor so there is an extra capacitor C10 (470 pf) which is paralleled with a 1N capacitor to get as close as possible to 1.5N. It was done in DIY Layout creator, a really nice program.

[km-r]

hello guys,

here is a comparison of theV30 simulatorang the marshall xlr output...
with the same number of op-amps, the marshall xlr has higher signal gain [i just scaled it down] and has a sharper freq response.

the V30 was simulated with a 9v supply, 4.5v ground...


green: marshall xlr
red: celestion V30 sim

[frank_p]

Do you see the graph on the forum ?  I can't see it.  I have to "reply" and get the .emf file from there...

[meffcio]

Anyone PCB for +\- 15v?
Not perf-  or stripboard.
Or shall I make one? xp

[meffcio]

there aleady is a pcb layout for this made by the french guys that designed it.  there is a link to it in the thread in the "other" forum.

Well... this may be funny, but... I still can't find it there...