Any cab simulator circuit worth building?

[Rob Strand]

There was a thread many moons about it.   Two stages works OK.
http://www.diystompboxes.com/smfforum/index.php?topic=73342.0

Here the schematic with the dead link,


IIRC it needed a bit more hf roll-off.

Wouldn't be hard to some low cut with a series cap.

[deadastronaut]

Cool. Cheers rob.

I will pop him on the breadboard too...

[Rob Strand]

I will pop him on the breadboard too...

I just noticed, as drawn the circuit has some deliberate signal loss.

To reduce the signal loss:
- R1 and R2 can be replaced by R1 = 1.2k and R2 = open
- R3 = 5.1k or R3=5.6k and R4 = 47k

All I'm doing here is removing signal loss from the dividers without stuffing up the response too much.
Like if you had R1 = 1.0k and R3 = 4.7k and played with the caps that would be fine.

[deadastronaut]

cheers rob, yup, just tried that...pretty cool as an experiment. can be added in a pinch..nifty

these look interesting from that thread too...

http://www.aronnelson.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=38207&g2_


anyway, im going to try the hexe site marshall jmp1 from here next, i like the idea of an headphone out too.

http://www.hexeguitar.com/images/schm/JMP1-cabsim.gif

back to the breadboard...

[deadastronaut]

just tried that jmp1 circuit, no joy....no sound.

i'll re bread it later, but it should work as it is yes?

[bluebunny]

Looks like that JMP-1 scheme is intended for a bipolar +15V/-15V supply.  You can see it at the top of this more complete schematic.

[deadastronaut]

yup it is , gotya.... cheers bunny..

[temol]

There is also single supply version available http://heavypage.narod.ru/shems/speakersim_jmp.gif

and stripboard layout


T.

[deadastronaut]

brilliant, cheers temol .




edit: yup, that works ok...cheers..

[287m]

how this? i know nothing about spice

[deadastronaut]

ive run out of breadboards lol...

[temol]

287m - this circuit looks like TrueVAL's design

Left - simplecabsim by Lart, right - from schematic that you've posted



T.

[287m]

287m - this circuit looks like TrueVAL's design

Left - simplecabsim by Lart, right - from schematic that you've posted



T.

Aha! dig trueVaL and Jokerx folder.
its just messed the value, right? 

bored, cant solder anything
here the try spice, compare jmp from Hexeguitar and heavypage value


ah, where drp cabsim? nobody like that? 

[bluebunny]

ive run out of breadboards lol...

Noooooooooooooooooooooooooooooooooooooooooo!!   

[Rob Strand]

cheers rob, yup, just tried that...pretty cool as an experiment. can be added in a pinch..nifty

these look interesting from that thread too...

As far as value for effort go those simple circuits have a lot to offer.
Beyond that it's amazing how each small improvement makes the circuit grow and grow.

[J0K3RX]

I've seen quite a few people in various forums saying how great the Blackstar emulated out is so, I converted a couple from bipolar. I haven't built them but, I tested them in NI Multisim and they seem to be working good enough...

http://imgbox.com/g/rxlJR2queP

[deadastronaut]

cheers jim, added to the ever expanding folder of 'sims'


another 2 for the breado...

[Rob Strand]

The HT5 circuit looks a bit like the Marshall JMP1.
For kicks I plotted the response of the two Blackstars and the Two Marshalls.
The LF response options of the HT5 is kind of "up" and "down" of the Marshall JMP1.
The HT1 response looks a bit like some of the HK units.

For the JMP1 I've use 3.9k on the last stage.  (IIRC some schematics used 3.3k).

The HT5 shows the shelf above 10kHz.




Oh, yeah,  keep in mind the vertical scaling might not match what yours ears perceive as equal levels.   So don't read the graphs too precisely.  Try to picture shifting the curves up and down over a small range when you compare two curves.

[J0K3RX]

The HT5 circuit looks a bit like the Marshall JMP1.
For kicks I plotted the response of the two Blackstars and the Two Marshalls.
The LF response options of the HT5 is kind of "up" and "down" of the Marshall JMP1.
The HT1 response looks a bit like some of the HK units.

I thought the same about the HT5 circuit looking similar to the JMP1 which made me curious... I listened to a couple youtube videos of the HT1 and HT5 emulated out and they didn't sound too bad. So, I dropped them into Multisim, plotted the responses against the JMP1 and got nearly the same results as you did. I ended up tweaking both of them and I think improved the HT1 quite a bit. The HT5 just needed to be brought down a bit and I ended up ditching the 1x12 switch... May add it back later but from a different angle..

[287m]

im not breadboard guy. 

just curious, what happen (in real life) if we ditch 1n5 and 12k in choice switch? and add 1M bias resistor in IC1b?