Anyone build a Terrarium with Daisy Seed v1.2 rev 7? (I'm getting unusually bad noise) - SOLVED

[FuzzyLotus]

Clear as day! Thank you so much! Now onto ordering some stand off boards LOL!

 

[keyth72]

Clear as day! Thank you so much! Now onto ordering some stand off boards LOL!

Honestly you could probably just twist the leads together, solder them, and wrap in in electrical tape and be fine, good luck!

 

[FuzzyLotus]

I think I messed something up, I have added the circuit but getting a very loud sine wave lol

Edit: oh I think I put my ground on the wrong terminal lollll
Edit2: yup! Had grounded on output instead of ground haha! Super clean now! I'm happy!

 

[keyth72]

I think I messed something up, I have added the circuit but getting a very loud sine wave lol

Edit: oh I think I put my ground on the wrong terminal lollll
Edit2: yup! Had grounded on output instead of ground haha! Super clean now! I'm happy!

That's great!

 

[justin23000]

Thank you so much for this @keyth72 !! You are a knight in shining armor!

 

[Davemulls]

Hey @keyth72 I'm trying to get this filter working having the same noise, I haven't had success so I was hoping you could verify the setup. from the third pin from the right on the daisy seed board (looking at it from the back of the pedal) I have a 3.3K resistor running into two 4.7nf caps in series (didn't have any 2.2 on hand) which then runs to the ground on my output jack. Anything I'm missing? I used an alligator clip to A/B it and no change at all. Any ideas?

 

[keyth72]

Hey @keyth72 I'm trying to get this filter working having the same noise, I haven't had success so I was hoping you could verify the setup. from the third pin from the right on the daisy seed board (looking at it from the back of the pedal) I have a 3.3K resistor running into two 4.7nf caps in series (didn't have any 2.2 on hand) which then runs to the ground on my output jack. Anything I'm missing? I used an alligator clip to A/B it and no change at all. Any ideas?

Is the 3.3k resister connected is series with the U2 capacitor? Only the 2.2nF should go to ground, after the 3.3k resistor. It should go audio out pin, to the 3k3, to the U2 cap, with one end of the 2.2nF cap between 3k3 and U2, and the other end connected to gnd. If you’re not sure send a picture of your fix and I can verify if that’s the case. I’m realizing it’s hard to describe a circuit with just words!

From your description it sounded like you have both the new cap and resistor in series going to ground, but the resistor needs to be in the path of the audio. If you already have the terrarium built it’s a pain to fix because you have to remove the U2 cap, or at least one end of it, and insert the 3k3 in the signal path somehow.

 

[Davemulls]

Is the 3.3k resister connected is series with the U2 capacitor? Only the 2.2nF should go to ground, after the 3.3k resistor. It should go audio out pin, to the 3k3, to the U2 cap, with one end of the 2.2nF cap between 3k3 and U2, and the other end connected to gnd. If you’re not sure send a picture of your fix and I can verify if that’s the case. I’m realizing it’s hard to describe a circuit with just words!

From your description it sounded like you have both the new cap and resistor in series going to ground, but the resistor needs to be in the path of the audio. If you already have the terrarium built it’s a pain to fix because you have to remove the U2 cap, or at least one end of it, and insert the 3k3 in the signal path somehow.

Thanks for getting back to me, you're right I had it in series to ground! I'm new to circuit modification so I just want to make 100% sure I've got it right, is this shitty diagram I drew correct?

 

[keyth72]

Thanks for getting back to me, you're right I had it in series to ground! I'm new to circuit modification so I just want to make 100% sure I've got it right, is this shitty diagram I drew correct? View attachment 77170

Yes, that’s correct!

 

[Davemulls]

Yes, that’s correct!

Awesome thanks!

 

[keyth72]

Awesome thanks!

I just thought of something, if you have the C2 cap soldered in place already, make sure remove the lower C2 lead from the hole, otherwise it will still be connected directly to the audio output pin.

 

[Davemulls]

I just thought of something, if you have the C2 cap soldered in place already, make sure remove the lower C2 lead from the hole, otherwise it will still be connected directly to the audio output pin.

Ah ya good catch! Will do

 

[scott3t]

This fixed it, low pass filter right after the audio output of the daisy seed. Used 3.3k resistor and 2.2nF cap for a 22kHz low pass, as shown in the diagram.

@Robert I recommend (after verifying with your own test) a revision to the Terrarium to include this LP filter for use with the Daisy Seed v1.2 rev7. Might want to reach out to Electrosmith to verify this is the configuration they plan on using going forward. I’ll be making this change to my own custom boards that use the Daisy seed.

If anyone else tries this please share results! More data points would be great!

Edit: if anyone can explain why this works that would be awesome, clearly the noise isn’t above 22khz or it would be inaudible, so I’m guessing something else is happening in the LP filter circuit/daisy seed output that makes it happy.

Here is the “before” noise I shared in the Electrosmith forum:

It looks like you didnt have to use the

This fixed it, low pass filter right after the audio output of the daisy seed. Used 3.3k resistor and 2.2nF cap for a 22kHz low pass, as shown in the diagram.

@Robert I recommend (after verifying with your own test) a revision to the Terrarium to include this LP filter for use with the Daisy Seed v1.2 rev7. Might want to reach out to Electrosmith to verify this is the configuration they plan on using going forward. I’ll be making this change to my own custom boards that use the Daisy seed.

If anyone else tries this please share results! More data points would be great!

Edit: if anyone can explain why this works that would be awesome, clearly the noise isn’t above 22khz or it would be inaudible, so I’m guessing something else is happening in the LP filter circuit/daisy seed output that makes it happy.

Here is the “before” noise I shared in the Electrosmith forum:

Do you need to use the Opamp IC in the diagram or only the resitor and capacitor?

 

[keyth72]

It looks like you didnt have to use the

Do you need to use the Opamp IC in the diagram or only the resitor and capacitor?

Only the resistor and capacitor, the op amp is the already existing part of the circuit (TL072 in the terrarium).

 

[scott3t]

Ah ya good catch! Will do

If C2's lower leg is disconnected, can it be completly removed?

 

[keyth72]

If C2's lower leg is disconnected, can it be completly removed?

No, with the added lowpass filter the lower leg of C2 is connected in series with the new 3k resister to the audio pin. Without the lowpass filter it's connected directly to the audio out pin. So think of the 3k resister as going in between the audio out pin and C2. If you look at my picture earlier in this thread, I did end up completely removing the original C2 due to space, and I put it on a separate pcb with the lowpass filter.