Seabed delay quick question

[steviejr92]

So I’m building the seabed delay and in the BOM it asks for a 33r resistor now I looked at the schematics and it looks like 33r is connected to the 1n5817 diode in the power section since that diode is there for circuit protection I’m guessing it’s there to help it but im not really sure what it does there. I don’t have a 33r what can I use as a sub? If it’s as low as that value it must be letting in all 9v maybe it helps with cleaning up the signal?

 

[swyse]

I wondered this too before on this exact pedal when I built a vero clone of it a few years back, it's apparently both for noise reduction and current limiting, I'm not sure what a suitable replacement would be though.

 

[steviejr92]

I wondered this too before on this exact pedal when I built a vero clone of it a few years back, it's apparently both for noise reduction and current limiting, I'm not sure what a suitable replacement would be though.

Yeah it’s halted my building of it I don’t want to make any rash decisions before I get a clear answer on a sub

 

[Route14]

So I’m building the seabed delay and in the BOM it asks for a 33r resistor now I looked at the schematics and it looks like 33r is connected to the 1n5817 diode in the power section since that diode is there for circuit protection I’m guessing it’s there to help it but im not really sure what it does there. I don’t have a 33r what can I use as a sub? If it’s as low as that value it must be letting in all 9v maybe it helps with cleaning up the signal? Is it a pull down resistor?

I do NOT technically know the answer so take this with a grain of salt. I've also wondered the same thing because it would be nice to use the same value in my builds without getting several different values based on what the original builder used. (I'm assuming.) That said this link seems to suggest anything from 10-100 ohm would work but I'm not sure if this translates to using a 1N5817.

https://www.diystompboxes.com/smfforum/index.php?topic=118554.0

Sorry to not be of more help. I'll be following this thread because I'm curious to hear the answer!

 

[steviejr92]

I do NOT technically know the answer so take this with a grain of salt. I've also wondered the same thing because it would be nice to use the same value in my builds without getting several different values based on what the original builder used. (I'm assuming.) That said this link seems to suggest anything from 10-100 ohm would work but I'm not sure if this translates to using a 1N5817.

https://www.diystompboxes.com/smfforum/index.php?topic=118554.0

Sorry to not be of more help. I'll be following this thread because I'm curious to hear the answer!

Thanks a lot man will be giving this a read! Appreciate the help!

 

[steviejr92]

So this is saying WITH a 1n4001 anything up to 100 ohms should work. Which I have a 1n4001 I’ve seen these used for circuit protection as well maybe this will work….
Still want to be sure though!

 

[Route14]

So this is saying WITH a 1n4001 anything up to 100 ohms should work. Which I have a 1n4001 I’ve seen these used for circuit protection as well maybe this will work….

I do NOT think you can sub the 1N5817 with a 1N4001. I think the circuit protection is working differently. I'm wondering if the attached resistor has the some purpose in both scenarios.

 

[Route14]

https://forum.pedalpcb.com/threads/protection-diodes.11808/#post-120958

 

[K Pedals]

So I’m building the seabed delay and in the BOM it asks for a 33r resistor now I looked at the schematics and it looks like 33r is connected to the 1n5817 diode in the power section since that diode is there for circuit protection I’m guessing it’s there to help it but im not really sure what it does there. I don’t have a 33r what can I use as a sub? If it’s as low as that value it must be letting in all 9v maybe it helps with cleaning up the signal? Is it a pull down resistor?

I can send you a 33r resistor…

 

[steviejr92]

So all in all it’s there for reverse polarity protection. So it looks like I can omit it entirely but I just won’t have circuit protection at all. Not sure what to do here haha

 

[steviejr92]

I can send you a 33r resistor…

Dude that would be really helpful! But my tinkering mind is going crazy I kind of want to figure this out with what I have if it comes down to it can I take you up on this?

 

[Boba7]

if you have anything between 33r and 100r it'll be fine. The Rat for exemple uses a 47r there I think. Pretty standard value.

 

[steviejr92]

if you have anything between 33r and 100r it'll be fine. The Rat for exemple uses a 47r there I think. Pretty standard value.

this is very good to know but I just got saved by @K Pedals haha thanks a lot I just looked anyways and realized I have an order from stompbox parts coming in containing 100r resistors so I would’ve had to wait regardless haha

 

[phi1]

My understanding is that resistor is just there to improve the filtering of the 100uF cap. A large R will lower the corner frequency (f=1/(2piRC). You don’t want to go too crazy with it though. If it’s a pedal circuit that draws a fairly high current (like Fv-1 based), you can get a high voltage drop over that resistor (V=iR). I often use 10R and don’t think any more about it.

Plenty of pedalpcb projects Don’t have any R there and it shouldn’t be an issue unless you have a noisy power supply. You could even jumper it in your build if you want to keep things moving.

 

[steviejr92]

My understanding is that resistor is just there to improve the filtering of the 100uF cap. A large R will lower the corner frequency (f=1/(2piRC). You don’t want to go too crazy with it though. If it’s a pedal circuit that draws a fairly high current (like Fv-1 based), you can get a high voltage drop over that resistor (V=iR). I often use 10R and don’t think any more about it.

Plenty of pedalpcb projects Don’t have any R there and it shouldn’t be an issue unless you have a noisy power supply. You could even jumper it in your build if you want to keep things moving.

The noisy power supply shouldn’t be an issue. this is good to know I need to get more lower value resistors all of mine are above 470r or so until I get my order. Going to just be patient and wait for them to come in!

 

[Boba7]

My understanding is that resistor is just there to improve the filtering of the 100uF cap. A large R will lower the corner frequency (f=1/(2piRC). You don’t want to go too crazy with it though. If it’s a pedal circuit that draws a fairly high current (like Fv-1 based), you can get a high voltage drop over that resistor (V=iR). I often use 10R and don’t think any more about it.

Plenty of pedalpcb projects Don’t have any R there and it shouldn’t be an issue unless you have a noisy power supply. You could even jumper it in your build if you want to keep things moving.

If I use an inline resistor I generally use 22r or 47r. Sometimes if the circuit is really noisy, 100r and a 100uf cap can cure it. But yeah, careful with the balance between current and voltage drop, you're right.

 

[steviejr92]

If I use an inline resistor I generally use 22r or 47r. Sometimes if the circuit is really noisy, 100r and a 100uf cap can cure it. But yeah, careful with the balance between current and voltage drop, you're right.

Keeping this in mind!