Diodysus V3

[kierkegaard]

Schematic: https://imgur.com/a/N4GWEW1

wondering if anyone might have a minute to scan over this and see if anything seems wrong, or i know enough about it to explain what i have done, it works nicely on breadboard (if i have done the schematic properly)

have auditioned 25 diodes and chosen my favourite 8 to go in it, its pretty simple but im happy with how its going!

I'm basically ready to convert over to vero board, what software do people use to do that? its something ive never done before so any pointers would be amazing

thanks all, hope you are enjoying the summer

j

[11-90-an]

Does C3 and the 10k pot make any difference in sound? From looking at it, it shouldn't be doing anything because you are effectively shorting it to ground... Please correct me if I'm wrong...
You could add some pulldown resistors on input and output to ground...1M or bigger would be nice...

You can use DIY Layout Creator... it has a simple and effective interface... Here it is...https://www.diystompboxes.com/smfforum/index.php?topic=44838.0
Never actually used veroboard, but i think the universal rule of "as-small-as-possible" should help...

[antonis]

Does C3 and the 10k pot make any difference in sound? From looking at it, it shouldn't be doing anything because you are effectively shorting it to ground...

That's exactly the reason for doing something (its friends call it High Pass Filtering..)
(well, not precisely grounded but close enough - 600mV above..)

Despite (or should I say additionally..??) to the above, 10k pot acts as diode pair current limiter with also adjustable clipping headroom..

[11-90-an]

That's exactly the reason for doing something (its friends call it High Pass Filtering..)
(well, not precisely grounded but close enough - 600mV above..)

Despite (or should I say additionally..??) to the above, 10k pot acts as diode pair current limiter with also adjustable clipping headroom..

Ahh i was talking about this rc network here:

I would relate it to putting a filtering cap in PSU and shorting it with a wire link... But if you say so, antonis, i guess it must be true... 

I understood the diode pair current limiter... experimented with it too...

BTW, excuse me for asking, kierkegaard, why is this pedal V3? If i remember correctly there was only one other Diodysus... seems like good branding for a line of pedals...

[niektb]

You could lower R1 to 33k (according to the Fetzer Valve which you seem to copy)

also B10k and C3 should be connected to the source of the fet, not to ground.

Have you double-checked your FET? A 2N5487 is not very commonly used -> 2N5457 of 2N5458 are seen more often. In case of the latter two you can lower your source resistor to ~400ohm to get more gain. And maybe adjust your Rd too? 15k seems quite high to me (http://www.runoffgroove.com/fetzervalve.html#11 has a couple of measurements based on common FET types)

[antonis]

I understood the diode pair current limiter... experimented with it too...

I'm deeply sorry for underestimating both your knowledge and experience..

(I can ensure you, honestly, it will NEVER EVER happen again..)

[11-90-an]

I understood the diode pair current limiter... experimented with it too...

I'm deeply sorry for underestimating both your knowledge and experience..

(I can ensure you, honestly, it will NEVER EVER happen again..)

Don't worry antonis, I still need you and this forum's experience much more, and I barely know any technicalities.. After all, everything I learned about pedals came from here...

Now back to topic, shall we? 

[kierkegaard]

Does C3 and the 10k pot make any difference in sound? From looking at it, it shouldn't be doing anything because you are effectively shorting it to ground...

yeah so thats the bit im not too sure i got right in the schematic, it adds extra gain for the diodes and the pot controls it

i copied the circuit from something called a jfet booster someone else linked me too

[kierkegaard]

BTW, excuse me for asking, kierkegaard, why is this pedal V3? If i remember correctly there was only one other Diodysus... seems like good branding for a line of pedals...

hey thanks! yeah diodysus v2 was my principle breadboarding which went well and v3 is the consolidating everything for veroboard, I guess they are beta versions, its a good point i should really say 'stage' instead of 'version shouldnt I

[kierkegaard]

You could lower R1 to 33k (according to the Fetzer Valve which you seem to copy)

also B10k and C3 should be connected to the source of the fet, not to ground.

Have you double-checked your FET? A 2N5487 is not very commonly used -> 2N5457 of 2N5458 are seen more often. In case of the latter two you can lower your source resistor to ~400ohm to get more gain. And maybe adjust your Rd too? 15k seems quite high to me (http://www.runoffgroove.com/fetzervalve.html#11 has a couple of measurements based on common FET types)

as a jfet booster c3 connects to the ground everywhere else that ive seen so i copied that

R1 do you know what difference it might make? I hadnt put much thought into it and copied something else and it worked

regarding FET i think i will probably end up using a J201, it fit in quite nicely and is alot more common R2 at 15k was to get volume without pushing the transistor much, experimented around and it seems to sit nicely about there

[11-90-an]

hey thanks! yeah diodysus v2 was my principle breadboarding which went well and v3 is the consolidating everything for veroboard, I guess they are beta versions, its a good point i should really say 'stage' instead of 'version shouldnt I

good idea...
you could also call it alpha 1.0, beta 1.0 and you will sound very professional 
I dig the name a lot 

R1 do you know what difference it might make? I hadnt put much thought into it and copied something else and it worked

It prevents loading the jfet too much and lowers input volume a bit

[antonis]

as a jfet booster c3 connects to the ground everywhere else that ive seen so i copied that

C3 is a 2 leg item..
No argument about one of its leg grounded..
The other one MUST go to JFET Source..
(or else, it can't bypass R4, hence no elevated gain for AC..)

R1 do you know what difference it might make?

R1 & R3 form a signal voltage divider on FET Gate, so better lower its value down to 1k or so..

[kierkegaard]

C3 is a 2 leg item..

yeah i was assuming that you might understand when i said C3 connects to ground  on a JFET booster circuit i meant the ground/source leg on the JFET

i just totally realised my mistake though, ive drawn it as post R4 where it should be pre! nice one, thanks for the pointer

I was sitting here thinking, it IS going to source looking at my breadboard