CHASM REVERB

[samhay]

Good catch - sorry, that should be lug 3. Will update post, but the log pot recommendation still holds.

As far as the audio probe goes, here is half of the answer: the op-amp's inverting input (pin 2 and 6 in the TL072 package) has very low impedance and will try be be at the same voltage as the non-inverting input if DC feedback in applied (as it is here). The inverting inputs in IC1B,  IC2A and IC2B can be considered to be at virtual ground as the non-inverting inputs here are grounded (well connected to VB). If you audio probe VB, you won't hear anything either.

[zedsnotdead]

Good catch - sorry, that should be lug 3. Will update post, but the log pot recommendation still holds.

As far as the audio probe goes, here is half of the answer: the op-amp's inverting input (pin 2 and 6 in the TL072 package) has very low impedance and will try be be at the same voltage as the non-inverting input if DC feedback in applied (as it is here). The inverting inputs in IC1B,  IC2A and IC2B can be considered to be at virtual ground as the non-inverting inputs here are grounded (well connected to VB). If you audio probe VB, you won't hear anything either.

Thank you so much for your time explaining this. Really appreciate it.

Now for some good news: I just soldered a 5K resistor to MIX pot lug3, and it works flawlessly!! So gooood!!!! 

Thanks again samhay!!

[marshalito]

hi all, I have little knowledge of electronics and is the first pedal I'm trying to build, but unfortunately has pop when I press the button and the  oscillation does not work.

thank anyone who can help me.

greetings .

[deadastronaut]

Hi, for the pop issue, i had this on one build only, and i changed the fets and it cured it instantly

Hence why we always suggest socketing fets/IC's etc...

which switch did you use for the oscillation switch?... 2 lug spst?...3 lug spdt?

[marshalito]

hello,

     Thanks for the reply, I will try to put sockets on the board and I'll tell you if the pop disappears.

about the oscillator I'm using 3lug spdt .

sorry for my bad English , best regards .

[toziano]

Hi everyone.
First I wanna thank Deadastronaut for his incredible job. This reverb is just great and I can't wait to build it and most of all... use it!!. Actually this is my first diy project so I wanna ask you something:

• I read something about the bypassing of the signal when the pedal is off. Is this dude true bypass? If not, is it a big deal?
• What kind of wire should i use for the signals? The differences between shielded ones and not shielded are relevant for this project?
• Should I connect the entire enclosure to GND or just let it float?
• I read in your pdf that there is the opportunity of replacing the osc/off switch with a footswitch. How do i wire it? how can i add a led to it? I won't thank you enogh if you will be so patient to draw me a little sketch of the wiring diagram
• About the BOM. Do you have any suggestion for the passives? Is there any filter cap?

I think that I asked everything i had to Thank you again and sorry for my bad english

[deadastronaut]

Hi everyone.
First I wanna thank Deadastronaut for his incredible job. This reverb is just great and I can't wait to build it and most of all... use it!!. Actually this is my first diy project so I wanna ask you something:

• I read something about the bypassing of the signal when the pedal is off. Is this dude true bypass? If not, is it a big deal?

hi, this is a buffered bypass reverb, this allows you to have ''tails'' when bypassed, if it were true bypass it would stop abruptly...which imo is nasty ad not very 'live' friendly..
buffered v's true bypass is a bit of a weird purist thing really, myself i quite like  buffered bypass , especially at or near the end of my chain..
others may not...but to me its fine..no big deal at all..

• What kind of wire should i use for the signals? The differences between shielded ones and not shielded are relevant for this project?

no need for sheilded wire, sheilded is mainly used in high gain circuits...distortions etc

• Should I connect the entire enclosure to GND or just let it float?

it will be grounded through the jacks etc...

• I read in your pdf that there is the opportunity of replacing the osc/off switch with a footswitch. How do i wire it? how can i add a led to it? I won't thank you enogh if you will be so patient to draw me a little sketch of the wiring diagram



• About the BOM. Do you have any suggestion for the passives? Is there any filter cap?

the filter caps (electrolytics)  are in the design..


[/list]
I think that I asked everything i had to Thank you again and sorry for my bad english

your english is fine man...no worries.

as this is your first project i would keep it simple for now, get it working and tested out of the box first and we will go from there
with the ''optional footswitch ok.....rob.

[toziano]

Thank you rob, i'll follow your lead 
I'm doing the bom right now.. so excited!!

[deadastronaut]

cool.. yeah its a great reverb man..

[cosmonautcroc]

Hi everyone,

New here and I'm still working my way through reading the thread but figured I'd ask anyway. Not sure if this has been answered.

First off I know there is a lot going on inside the box (4 pots, switches, the brick and the board itself) but has anyone tried running this off a battery / tried fitting one in the enclosure?

Thanks for the help!

[samhay]

It will work with a battery for a little while - perhaps 1-10 hours depending on the type of battery.

[cosmonautcroc]

Thanks Sam! I didn't really doubt that it would work just wondering on battery life and if anyone had any experience with it. Personal preference but I like building both options into my pedals. So just curious.

[marshalito]

Hi, for the pop issue, i had this on one build only, and i changed the fets and it cured it instantly

Hence why we always suggest socketing fets/IC's etc...

which switch did you use for the oscillation switch?... 2 lug spst?...3 lug spdt?

thank you very much deadstronaut the  pedal works very well , it is true change the FETs remove the pop so I take this into consideration in the next pedal job , besides this pedal is a awwesome project i am very  happy bye.

[deadastronaut]

Cool..glad it got it sorted man...

[hammer8994]

I built the pedal and it sounds great! But on the second day the OSC switch stopped creating feedback and instead shortened the decay time to 0% (which stopped the decay pot from moving.) The pedal still works fine when the OSC is off, but are there any ideas on what could be wrong?

Ive followed the schematic with a Multimeter and it all seems to be fine, and double checked the values of R11, R12 & C8. But still no dice! Any tips?

[deadastronaut]

I guess the obvious would  be to check the switch....

if it worked , then it suddenly didn,t, it may be that...

or a short out somewhere...

[Sporasankari]

Hello everyone! I am new one this forum, but i have been reader over one year. Ok now I have litlebit problem whith Chasm reverb. Out signal is very low to amp. Pedal is working As It shud be. I have TL074CN on IC1 problem? Great pedal very Nice reverb but so quiet 
Spring is finaly in Finland.

[deadastronaut]

you made a diy pcb then?...

[hammer8994]

Got my pedal working by the way rob! Just had a crappy soldering job on R11. Thanks for you help, sounds great!

[deadastronaut]

cool...glad you got it sorted man..