ASTROSIM (cab simulator)

[dschwartz]

That "dual sallen key" filter on the HT5....never seen that before...
So many ways to peel a cat!!!

[Rob Strand]

That "dual sallen key" filter on the HT5....never seen that before...
So many ways to peel a cat!!!

It pops up now and then.   IIRC it's in the Eden bass amps.
Works best when the HPF and LPF cut-off frequencies are far apart.

[EBK]

I think I'm going to try building this sometime in the nearish future (inserting it high into my queue).  I found in my stash one NE5532 and two NE5534 chips (single op amp package, but with supposedly better noise performance -- I haven't looked at the datasheets).  Any suggestions as to which parts of the circuit I should use the NE5534s, assuming I would ever be brave enough to disregard Rob's explicit admonishment, "NE5532 ONLY"?   

[anotherjim]

Cooked to perfection.
I dunno if C1 is drawn the wrong side of R2 in the scheme? Otherwise, the protection diode is half blocking C1 from helping.
Chips other than the NE5532 could work, but they can be more expensive and rarer, especially in the uk.
We've seen some more modern high-performance audio driver op-amps don't like resistor bias dividers. You could try LM833 or RC4580 etc if you want. I've seen the 4580 used in commercial products either for phones and balanced drive.

[pinkjimiphoton]

a 5534 is just a single OA version of the 5532. if ya like one, you'll like the other.

ca3140 ez is a cool chip i been playing with that may work well in single OA situations, it will work on stupid low voltages and can go half a volt below the rail without farting. cool chip, check it out!

[Rob Strand]

Quote

    The gain at the high peak is 24dB...looks like it's too much. Are you intending to clip the highs? The following "passive" twin tee will reduce the harshness..

Without the peak, the high-end is a bit like the BlackStar HT5.   The low-end also has some similarity with the BlackStar HT5.  The ASTROSIM has more lows.   The circuits themselves are quite different.

I might need to retract that.  I think something screwed up on one of my spreadsheets.
There is a response like the ASTROSIM without the HF peak but it might not be the BlackStar HT5.

Be warned - Apache Office has some nasty bugs when you copy sheets containing graphs.
If you select the graph then right click on a graph and see the option "Data Ranges" in the pop-up menu it's probably OK.  If you see "Chart Data Table" it can easily screw-up (or is screwed-up).  You cannot trust what you see, especially if you have edited something.

[bool]

I guess you could use a RC4559 as well.

Err.. speaking of openoffice? Do you know if the bug you talk about is also in libreoffice?

[vigilante397]

Sounds fabulous Rob, as always. I'll have to throw it on the list

[Rob Strand]

Err.. speaking of openoffice? Do you know if the bug you talk about is also in libreoffice?

I haven't checked the Libre OpenOffice on my Ubuntu OS machine, which is also a later version.

I used Apache because I had problems with the Optimizer plug in and also Thai languages on other versions in the past.  On both Libre and Apache, if you use plug-ins and other languages different things break on each version, sometimes crashing OpenOffice.

I noticed I get the "Chart Data Table" when I import from MS Office as well.  Once you get the "Chart Data Table" case you are guaranteed something bad will happen down the track.  It gets in a funny state and you can never get it back to the "Data Ranges" normal case.

I did do some searches and there were some issues in this area.   Sometimes it was reported in a slightly obscure way.

I'll power-up my Ubuntu machine tonight and let you know.

[EBK]

Maybe I just don't know enough about cab simulators, but I'm confused about a couple things here:

Is the output jack connected to the Line Out on the schematic?  What exactly does the stomp switch do in this circuit?

[Marcos - Munky]

Maybe I just don't know enough about cab simulators, but I'm confused about a couple things here:

Is the output jack connected to the Line Out on the schematic?  What exactly does the stomp switch do in this circuit?

I'm building it without the switch, with the line out hardwired to the output jack. I think deadastronaut built this one with line out being an "effect out" and the switch bypassing the cab simulator to the output jack, but still keeping the signal going thru the cab simulator for the headphones and xlr outputs.

[vigilante397]

I think deadastronaut built this one with line out being an "effect out" and the switch bypassing the cab simulator to the output jack, but still keeping the signal going thru the cab simulator for the headphones and xlr outputs.

That's how I interpreted it as well. Headphones and XLR out are always on, line out is footswitchable.

[deadastronaut]

^ yup..

basically a home recording box...does me. 

[Marcos - Munky]

So, I built it (board and offboard wirings only, not boxed yet) and did a quick test. I'm getting sound out of the line out. Didn't tested the XLR out with a real cable, but I'm getting sound out of it with an audio probe.

My issue is on the headphone out. I'm not getting any sound out of it. I've checked the parts values, and everything seems to be ok. Using an audio probe I've tracked the signal to pin 5 of the 5532, but I'm not getting any sound on pins 6 (don't know if it's supposed to be audio signal there) and 7. Here's my voltages:
pin 5: 5.132 V
pin 6: 5.884 V
pin 7: 8.25 V
pin 8: 8.93 V

That pin 7 voltage looks suspicious, should it really be that high?

Any clues?

[Killthepopular]

I'm thinking of building a cab sim. I like the XLR out and the extra controls on this pedal but from what I've heard i think the condor still sounds better so I'm leaning in that direction. What do you guys reckon? Condor vs Astrosim?

[vigilante397]

What do you guys reckon? Condor vs Astrosim?

Your ears are your ears. If the Condor sounds better to you, then build the Condor. If the Astro sounds better to you, build the Astro. Pretty simple decision, just trust your ears

[Ben N]

What do you guys reckon? Condor vs Astrosim?

Your ears are your ears. If the Condor sounds better to you, then build the Condor. If the Astro sounds better to you, build the Astro. Pretty simple decision, just trust your ears

But, of course, you'll have to build both to know which one sounds better to you, so--Catch 22. 

[stallik]

And when you've built both, there will be another. Feed the addiction

[dschwartz]

I haven't build the condor or the astrosim..but i can bet that the astrosim will be much better. The condor is just one cabinet emulated. The astrosim has a similar approach as my multicabsim. You can tweak it to sound just like you want

[lcv]

Is this  xlr out interface  compatible with phantom power supply ? (i.e. it's not going to be damaged  in case PS is activated mixer side)