Jawari do, Jawari don't

[11-90-an]

Breadboard! 

[anotherjim]

I'd leave the primary centre tap untouched if I can. You don't need it now, but you never know you might want to repurpose it in future and wish you hadn't cut it off.

[mitchelr]

Like I said before BREADBOARD

[moid]

Breadboard? Hah! I laugh in the face of danger! I, who takes his library books back a day overdue, who leaves his car parked five minutes after his ticket has expired, who sometimes drinks orange juice from the fridge on the evening it expires! Would I fear a mere circuit?  I bestride the world like a colossus! I... what's that? Oh yes, yes, okay, I'll stop shouting. Yes I'll get down from that chair I was standing on. No dear, it won't happen again. No, I've no idea what came over me. Maybe it was the cheese?

ahem, modesty intrudes here to say that I have, in fact, fixed the bugger; thanks very much for all your suggestions though chaps. Some notable things that happened (for those who like the details). I first took out the old transformer and added the new 42TM018. Yay, Jawari sounds Lots of high pitched hiss, circuit is quite quiet, works well on the neck pickup, very crackly if I turn the pot, and also different constant background oscillation notes if I change from battery to wall power... oh and the pot works backwards??? Very odd. Anyway I thought, I've bought these bloody expensive J201s, I might as well try one in the socket the SMD version is in... put in the through hole J201 and the volume almost blew my ears off! Bloody hell this thing is loud! Also now the pot works the right way around. The oscillating background noise is gone (yay). The pedal even works on the middle and bridge pickup (slightly softer on bridge, but mid and neck seem as loud as each other).

More fun: If you plug the Jawari into a strong 80s analog chorus and then into an over the top reverb, well you got yourself a very 80s synth sound Nobody is ever going to mistake this for a sitar (which is a shame) but it does have a sound of its own which I will have fun with (and my son will be very happy tomorrow when he wakes up to find the circuit working! He's wanted this for ages). I need to box it next... aaah next weekend I guess. Anyway thanks all of you for your excellent help and suggestions, I'll be back soon with my next disaster

[11-90-an]

psychtar next? 



i think I'm one of those people who saved the entireity of Tim E.'s ckt snippets due to their usefulness...

[duck_arse]

was it Stilton?

also, what voltages do you measure on the jfet now, please?

[anotherjim]

SMD J201 gate is the middle pin. Thru' hole is an end pin. Was that right?
https://www.interfet.com/jfet-datasheets/jfet-j201-j202-interfet.r00.pdf

[matmosphere]

Glad you got it going. It's a fun one.


I managed to make mine sound a little like a sitar

https://soundcloud.com/matthew-raiteri/jawari

It's one of my favorite circuits.

[moid]

psychtar next? 



i think I'm one of those people who saved the entireity of Tim E.'s ckt snippets due to their usefulness...

Ooooh what does that sound like? There's only one demo on the internet, and the person who made it says it was modified from a Psychtar - it does actually sound a bit more sitar like than the Jawari... have you ever built one?

was it Stilton?

also, what voltages do you measure on the jfet now, please?

Odd you mention that, I'm rather fond of Cropwell Bishop (a slightly milder stilton than the usual type)... but it could possibly have been some slightly over ripe Pie d'Angloys....mmmm and now I'm hungry...

Okeydokey the DMM says Feed me Seymour! Errmmm no it doesn't, what it actually says is:

D 9.09V
S 449mV
G 0mV

Does that look interesting / useful? If you win the lottery with any of them, I wants a cut!

SMD J201 gate is the middle pin. Thru' hole is an end pin. Was that right?
https://www.interfet.com/jfet-datasheets/jfet-j201-j202-interfet.r00.pdf

Oh damn, so the SMD may be fine, I just had two of the legs in the wrong holes? Oh wait, it could be more embarrassing than that... I may have had the SMD PCB in the socket the wrong way around... like 180 degrees wrong... Well that might have impeded the sound in the pedal a bit... oh no wait, I did try try the PCB both ways on the old transformer and nothing happened either way around... aaah it might work on the new transformer... hang on... well blow me down fellas, if you put the PCB in the right way round you gets sound! Who woulda thought it eh?

OK to my ears the through hole J201 is a bit more pronounced and the sound is a bit sharper than the SMD J201. Now before Mr Duck gets his feathers in twist, I have measured the volts on the SMD version and there is a difference:

D 9.09V
S 429mV
G 0mV, but it takes about 30 seconds to drop to 0, and flickers above and below zero a fair bit - the through hole J201 dropped very rapidly to 0 and stayed there.

Would those small changes be enough to make a difference? Or am I just getting excited by mojo parts? Or do I need to justify spending £30 to buy a few old transistors...ouch.

Glad you got it going. It's a fun one.


I managed to make mine sound a little like a sitar

https://soundcloud.com/matthew-raiteri/jawari

It's one of my favorite circuits.

Wow, yours sounds better than mine - what are you doing to improve the sitar like sound? Is it just bending the strings? Or changes to the circuit? I like the pedal design you made as well!

Anyways, I let my son play with the pedal (he really liked it!), and in the course of testing the hell out of it we discovered a few things. The pedal on its own does not like two or more notes together and tends to go rather ring modulation-y if you do this... I'm not into that sort of sound, and neither is he so that wasn't great... then he found that if we put a clean boost pedal before the Jawari and give it some volume, the pedal presumably 'tracks' better because the ring mod disappears and you can play chords! So he wants me to put a booster circuit inside with the Jawari - anyone have any recommendations for something as small as possible and clean sounding? I've built LPB1s before but they don't sound very clean to me (or maybe that's how I build them) is there another circuit anyone can suggest that wouldn't have loads of parts (there's not much room in the enclosure) and can do say 15dB of clean boost?

He also discovered that is you remove the boost and play the straight Jawari through a bass guitar you get a good fuzzy bass with octave up sounds! Doesn't sound anything like a sitar, but sounds good!

[11-90-an]

>Ooooh what does that sound like? There's only one demo on the internet, and the person who made it says it was modified from a Psychtar - it does actually sound a bit more sitar like than the Jawari... have you ever built one?

No, that's why I'm asking you to build one! 
and yes, I also want to hear how it sounds...

>is there another circuit anyone can suggest that wouldn't have loads of parts (there's not much room in the enclosure) and can do say 15dB of clean boost?

from beavis audio:

Sometimes there is a little distortion... Maybe increasing the 6.8M resistor

[matmosphere]

I did not modify the circuit at all. I think I was playing a tele, but it might have been a danelectro. I tuned down two steps to make the bends easier.

[duck_arse]

Okeydokey the DMM says Feed me Seymour! Errmmm no it doesn't, what it actually says is:

D 9.09V
S 449mV
G 0mV

Does that look interesting / useful? If you win the lottery with any of them, I wants a cut!

it's bluebunny does the money handling.

OK to my ears the through hole J201 is a bit more pronounced and the sound is a bit sharper than the SMD J201. Now before Mr Duck gets his feathers in twist, I have measured the volts on the SMD version and there is a difference:

D 9.09V
S 429mV
G 0mV, but it takes about 30 seconds to drop to 0, and flickers above and below zero a fair bit - the through hole J201 dropped very rapidly to 0 and stayed there.

they are close enough to say same, and we generally don't worry about the gate voltgae, because it's 0V, but - your 30 seconds to drop [over target?] suggests you might have a problem w/ the gate bias resistor connection. check the resistance to ground from the gate pin [power off, obvs].

[Steben]

>Ooooh what does that sound like? There's only one demo on the internet, and the person who made it says it was modified from a Psychtar - it does actually sound a bit more sitar like than the Jawari... have you ever built one?

No, that's why I'm asking you to build one! 
and yes, I also want to hear how it sounds...

>is there another circuit anyone can suggest that wouldn't have loads of parts (there's not much room in the enclosure) and can do say 15dB of clean boost?

from beavis audio:

Sometimes there is a little distortion... Maybe increasing the 6.8M resistor

Aaaaaaah dze oooohms dze oooohms

really, c'mon wiz kids explain why these values?

[moid]

Hello everyone / Merry Christmas!

I hope you're all well! I'm resurrecting this one because I still haven't had a chance to finish it (finally got away from work yesterday and have two weeks off and the government has just put my area in lockdown; great timing ) but I hope to do so now. I was wondering about whether it would be a good idea to add an order switching switch to the boost circuit that will accompany the Jawari circuit (either Jawari first then boost or boost then Jawari) and I found this layout on Beavis:


Which looks easy to adapt (remove the audio sockets and just connect to the relevant circuit boards) and then I realised two issues - Firstly I need to but a 4PDT switch, which may take some time over Christmas; and secondly, would this circuit mean no more bypass signal? It seems to me that unless a 4PDT stomp switch has three 'clicks' as options then it will only work as an order switcher. Am I right? I've never owned a 4PDT switch so maybe they are magical things? Maybe I should just stick the boost in first and connect it to the Jawari and ignore switching...

Yeah this is rambling, sorry sometimes it helps me to type this all out to help my brain think about it, and work has been horrid the past three months and I've not been able to think at all about effects pedals, so need to get my brain back in order!

Thanks!

[iainpunk]

you omitted the link...

i guess you need 2 switches for order and bypass


and a bypass of choice. you can leave out the LED's in the order switcher and use a normal 3pdt.

i think that the volume difference between the orders would be quite big tho.

the psychtar takes off where the Jawari stops in terms of gain. but they are quite similar, the psychtar doesn't need the boost up front tho, it already has a nice amount of gain.

cheers, Iain

[Mark Hammer]

Glad you got it going. It's a fun one.


I managed to make mine sound a little like a sitar

https://soundcloud.com/matthew-raiteri/jawari

It's one of my favorite circuits.

VERY nice.  Does a credible emulation.

Of late, I have leaned towards using Schottky diodes instead of germanium in octave-up units.  They subtract less signal voltage and also allow for a slightly more graceful decay, which I suspect is part of the signature of an actual sitar.

[iainpunk]

Of late, I have leaned towards using Schottky diodes instead of germanium in octave-up units.  They subtract less signal voltage and also allow for a slightly more graceful decay, which I suspect is part of the signature of an actual sitar.

my special sauce of the Jawari seems to be using a 10k resistor and a Ge diode, it gives a more realistic clean decay. i didn't build a true Jawari tho, i used a 386 to drive a mains transformer low voltage side's 0v and 6v pins and tapped the transformer off at the -9v and 9V pins. the actual mains side was unused, i cut off the lugs and gooped it with liquid electrical tape

some sitars have quite a gentle decay, but those buzz way less, its really dependent on the jawari angle on them to get different sounds, lots of people like the jawari barely doing anything, most westerners like the super exaggerated jawari settings that buzz a lot and have shorter decay.

i think the Jawari pedal is a fun tool, but not too accurate in sound for someone acquainted with the instrument, the Dan Electro Sitar Swami is way worse tho...

cheers, Iain

[iainpunk]

so, i totally forgot i had this in my folder of schematics, it used to be on one of my high output pickups, a fun, gated and novel guitar wiring scheme. i recommend using a Ge and a Schottky diode, since the difference in leakage gives less cancelation wne they are both not in conductance.


cheers, Iain

[garcho]

its really dependent on the jawari angle on them to get different sounds, lots of people like the jawari barely doing anything, most westerners like the super exaggerated jawari settings

+1. I've got a lot of cool sounds from removing the bridge (obviously not on a string-through) and jamming something in its place that's flat, like a piece of wood with slate on top, or a piece of plexi.

[iainpunk]

good replacements for the elephant tusk used in originals are bovine bone, brass, steel, tile and some types of bakelite

cheers, Iain