cool reverb apart from switch spdt 'pop' issue

[deadastronaut]

@mike c: nice one mike, blimey that was a squeeze eh.....but a cool option that i should have thought of before....but hey never too late eh.

cheers man, your a star.

[haveyouseenhim]

Vol pot and DRYMIX pot mods complete. You'll see from the Layout file that the DRYMIX mod is slightly less tidy than my usual OCD would dictate... I've been trying all evening to re-route it without tearing the whole thing apart and starting again. So one of the pads for the DRYMIX pot is away from the other 2... Anyway, here are the new files for v1.5:

Layout
PCB Art
Schematic

Enjoy

I'm not sure I understand how you did the dry mix control. I thought lug 1 of the dry mix would go to ground. Like a volume control to kill the dry signal and keep the reverberated signal. Although I'm not very sure if that would even work.   I ain't wut yew call book smart  

[R O Tiree]

Lug 1 goes to Vb. The output from the first opamp stage is biased around Vb, as is the input to the mixer. Therefore, if you bias one end of the pot at Vb as well, that is your "virtual GND". The opamps don't care...  and you really want to avoid DC across a pot if you possibly can - that leads to scratchy noises as you adjust the pot.  If there had been decoupling caps in between the opamps then, yes, tying that pin to true GND would have been appropriate. I tested it in sim and even a 1k pot works!

[R O Tiree]

I realised earlier today that I had not implemented the Oscillation mod. I've just now finished that.

Here are the new v1.6 files:

Layout
PCB Art
Schematic

[deadastronaut]

cool, wasn't the oscillation done by changing 33k to a 22k?..IIRC.

68k ?

[chromesphere]

cool, wasn't the oscillation done by changing 33k to a 22k?..IIRC.

68k ?

^ thats what i did

[haveyouseenhim]

I realised earlier today that I had not implemented the Oscillation mod. I've just now finished that.

Here are the new v1.6 files:

Layout
PCB Art
Schematic

Well damn. I already etched the 1.5 board. Is there a way to still do that mod with this board?

[chromesphere]

I found by messing with R13 I was able to go from the default feedback with the 33k to some really cool sounding oscillation at 22k. With this tweaked I was able to get infinite-like reverb. I DPDT a 33k 22k 18K to switch it around. I might even look at adding a expression pedal output for R13.. Might be fun.

^ @mike (haveyouseenhim) - The original post from selfdestroyer.  Just add a switch to switch over 33k to 22k.  That's what I did.

[haveyouseenhim]

I found by messing with R13 I was able to go from the default feedback with the 33k to some really cool sounding oscillation at 22k. With this tweaked I was able to get infinite-like reverb. I DPDT a 33k 22k 18K to switch it around. I might even look at adding a expression pedal output for R13.. Might be fun.

^ @mike (haveyouseenhim) - The original post from selfdestroyer.  Just add a switch to switch over 33k to 22k.  That's what I did.

Cool   thanks. That's a good thing because I etched the newer boards but I fell asleep and left them in the etchant for SEVERAL hours. Some of the traces are pretty thin. 

[Jdansti]

I found by messing with R13 I was able to go from the default feedback with the 33k to some really cool sounding oscillation at 22k. With this tweaked I was able to get infinite-like reverb. I DPDT a 33k 22k 18K to switch it around. I might even look at adding a expression pedal output for R13.. Might be fun.

^ @mike (haveyouseenhim) - The original post from selfdestroyer.  Just add a switch to switch over 33k to 22k.  That's what I did.

Cool   thanks. That's a good thing because I etched the newer boards but I fell asleep and left them in the etchant for SEVERAL hours. Some of the traces are pretty thin. 

Please don't fry bacon. 

[haveyouseenhim]

I don't leave bacon. In fact, it never even hits the plate    I eat it as fast as I can cook it. If I don't return to the forum it's because I had a heart attack from eating bacon by the pound

[Jdansti]

LOL.  My father in law used to pour the bacon grease over his toast and never had heart trouble.

[deadastronaut]

Good old bread n dripping  we called it  .  Fat on toast yum

[R O Tiree]

The 68k is in series with a SPST switch and that assembly is in parallel with the existing 33k. Making the switch closes the circuit and the result of 33k||68k is a shade under 22.22k (within 1% of our 22k target). Open the switch and that leaves just the 33k in circuit.

The reason I did it is that SPST switches are cheaper than SPDT ones.  Also, a SPDT switch uses up one more pad's worth of real-estate on the board.

With the 1.5 board, you could simply take a pair of wires from the ends of that 33k resistor and then construct that series combo of switch and 68k point to point to achieve the same function.

[haveyouseenhim]

Good old bread n dripping  we called it  .  Fat on toast yum

LOL.  My father in law used to pour the bacon grease over his toast and never had heart trouble.

This was my first attempt at time travel......(based on a Jim Gaffigan joke)

[deadastronaut]

@mike. Of course, series. Para. Gotcha.  Man i need more coffe in the mornings  cool.   

now back to eating lard. , 

[aballen]

Ok, I just got a long brick in the mail for my tenebrion reverb, but after seeing the demos for this I think I'm building one of these.

Would anyone be interested if I had a few boards fabbed up?  It might take me a bit to get it all right in eagle, but once that is done, OSH park gets me boards pretty quickly.

[aballen]

Pixie dust!  Jim is great, I've actually seen him live twice.

Good old bread n dripping  we called it  .  Fat on toast yum

LOL.  My father in law used to pour the bacon grease over his toast and never had heart trouble.

This was my first attempt at time travel......(based on a Jim Gaffigan joke)

[Jdansti]

@Mike-How can you stand to eat that without a bag of fried pork rinds? 

BTW, If Paul McCartney sees your video, he'll never visit you. Just saying...

[haveyouseenhim]

@Mike-How can you stand to eat that without a bag of fried pork rinds? 

BTW, If Paul McCartney sees your video, he'll never visit you. Just saying...

Not a big beatles fan. So no skin off my teeth      

I'm almost done withe the reverb....Just waiting on the brick to get here