Dumble pedal with tremelo check

[aviherman5]

Hi, this is my pedal schematic. Does everything look good?



Thanks 

[patrick398]

I get the feeling that 555 is going to be awfully clicky/thumpy. Have you breadboarded this?

[antonis]

That "Unity Phase Splitter" puzzles me a bit..

P.S.
10M pull-down resistor isn't necessary in Boost stage input unless the later is engaged via some kind of switching..

[aviherman5]

Well doesn't the phase get inverted with the boost? So I invert it first with the phase inverter.  Then it goes into the eq stack, then into the boost which inverts it back to normal. Do I need the phase inverter?

Patrick,
I think I'm going to ditch the tremolo. Is it still a viable circuit otherwise?

[iainpunk]

that tremolo wouldn't work, the LDR is sandwiched between two ground connections...

the 10M pull down can be left out as mentioned before,

the phase inverter and the boost look exactly alike? is that meant to be so?
also, if you want the boost to act like a clean boost, the volume control is something to place BEFORE the last boost stage, so it stays clean by turning down the volume.

cheers, Iain

[aviherman5]

Ok thanks!

I'm gonna lose the tremolo and take out the 10m resistor. I'm a little confused on phase inversion. I know that the boost will invert the signal So what I decided to do his first invert the signal then run it through the EQ then put it through the boost which uninverts it. Is this correct?If it is, for the inverter, is my schematic OK? If not can you provide me with a phase inverter schematic? Thank you!

[antonis]

Well doesn't the phase get inverted with the boost?

Of course but it's the only one action (Phase) related with "Unity Phase Splitter"
(it Splits nothing and it definatelly exhibits much more than Unity gain..)

P.S.
Your Tonestack shouldn't like to be driven by 22k (or similar value) source output impedance..
Make 22k Drain resistor 6k8 or so both for lowering output impedance and more proper bias (quiescent point)

[aviherman5]

Ok changed the resistor. With these changes in mind, is everything good?

[11-90-an]

As I said in your previous thread...

Here ya go...


Untested, but should work... i think 

JFET booster from here

Choose 1 of the "ends"... end 1 has lots more volume and might even distort...(untested) if that happens scrap end 1 and go with end 2

EQ pot should probably be moved and replace the 100k resistor at the end of the EQ section... however I don't putting it before the EQ would have any drastic disadvantages...(again, just an assumption)

The resistor circled in orange adjusts the volume of the "dry" signal (seems redundant but hear me out) set it by turning all knobs to max, then adjust it until you can hear the EQ'd signal is almost equally as loud as the "dry" signal

There is a reason why my "dry" signal was taken AFTER the first boost stage, and not feom the input. This gives a less chance of too much phase cancellation, and also negates the use of an inverter.

As for the tremolo, you can ditch the 555 since that would give lots of audible thumps and clicks (as Patrick mentioned earlier), and use the Colorsound tremolo here...

https://www.aronnelson.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=2282&g2_serialNumber=2

You can probably disregard the BJT booster and just stitch the entire tremolo circuit to the last boost in your schematic... or maybe just tack it on the output. i will, if needed, draw another schematic...

[aviherman5]

Hi, thanks so much!!! I definitely took your advice on all the changes on your drawn schematic except the dry volume. I didn't really understand it and I figured I was going to use stewmac mix pots so I didn't want the pot in the area you put it although you definitely know better then I do. As of right now I ditched the tremolo and added a delay (that I know works and there's no need to draw out, I got it from easyeda and copy paste  ). If you wouldn't mind, could you please draw it out one more time? This is my draft I'm working on right now:



So basically it's almost identical to last time although I added your recommendations but removed the 10m input resistor and changed a 20k to a 6.8k. I want to make sure you understand how my mix control will work so here's a pic:



Here's the link to the site as well: https://www.stewmac.com/video-and-ideas/online-resources/learn-about-guitar-pickups-and-electronics-and-wiring/blend-pot-wiring.html

Ideally the clean signal (wether or not it's phase has to be inverted I don't know, as long as it hasn't been affected by the EQ or boost) would be mixed in with the boosted/EQ signal.

Again, really can't thank you enough and thank you for all your help. Another drawing would be so so so helpful!!!!

[11-90-an]

I recommend drawing everything as 1 whole connected schem and not as seperate blocks (as it becomes simpler for everyone looking at it.)

Here's how the mix pot would probably be wired for your needs...

[antonis]

As of right now I ditched the tremolo and added a delay (that I know works and there's no need to draw out, I got it from easyeda and copy paste  ).

There isn't any self-respecting DIYer who just copy-pastes a circuit without any modification.. 

So, delete R1, R2 & C21 and bias both non-inverting inputs (POS/1 & POS/2) from 7805 OUT..
(500mV offset might give a personal character to particular effect..)