Seek Trem issues

[Thewoodenone]

I am not getting any lighting up of the LEDs. I am sure that the anode and cathode are correctly oriented according to the board layout. I am getting a low voltage reading on the anode of around .07 but three is 9.45 at the dc input. I have reflowed everything. Can you all see anything I am missing or a misplaced part?

 

[benny_profane]

Please provide a better resolution picture. Remember, if you can't see it in the picture, we can't see it.

 

[Thewoodenone]

I selected the wrong size. See if this works better

 

[benny_profane]

Okay, thanks. Have you verified all the parts yourself and visually inspected your joints? You mentioned reflowing everything, but there are a number of areas that look like they may need attention. The board should also be cleaned.

EDIT: Resistor values seem okay. Have you adjusted the trim pots at all?

 

[Thewoodenone]

I think I just found it. I ordered 10v 220u caps and the fine print on the board says 25v. That's what I get for ordering parts off a part list before I got the board. I'm pretty sure this is the issue but correct me if I am wrong.

 

[Betty Wont]

I think I just found it. I ordered 10v 220u caps and the fine print on the board says 25v. That's what I get for ordering parts off a part list before I got the board. I'm pretty sure this is the issue but correct me if I am wrong.

Not ideal, but it should still function fine with a 9v adapter.

 

[Thewoodenone]

Not ideal, but it should still function fine with a 9v adapter.

Still no luck. Does anyone know what the v measurement should be on the LED for the opto? I turn the opto trim up but still measure pretty low at the highest setting.

 

[benny_profane]

Without a schematic, I can’t really help you much more. Keep in mind, though, that LDRs are more sensitive than your eyes and the LED doesn’t need to get as bright as you may expect. Have you tried the circuit with audio (with the LED/LDR shielded from external light)?

 

[music6000]

I am not getting any lighting up of the LEDs. I am sure that the anode and cathode are correctly oriented according to the board layout. I am getting a low voltage reading on the anode of around .07 but three is 9.45 at the dc input. I have reflowed everything. Can you all see anything I am missing or a misplaced part?

You should see a Flat side at the base of your led's, - K = Cathode

 

[Thewoodenone]

Without a schematic, I can’t really help you much more. Keep in mind, though, that LDRs are more sensitive than your eyes and the LED doesn’t need to get as bright as you may expect. Have you tried the circuit with audio (with the LED/LDR shielded from external light)?

It's the new board from this site. I don't see a schematic for it on here.

 

[Thewoodenone]

You should see a Flat side at the base of your led's, - K = Cathode

View attachment 30806

Yes these are correctly oriented as far as the board is printed.

 

[Betty Wont]

You should see a Flat side at the base of your led's, - K = Cathode

View attachment 30806

Not all LED manufactures use this convention. The LEDs I use as indicators in my builds have the flat side on the Anode.

 

[Robert]

https://docs.pedalpcb.com/project/Schematic-SynchroTrem.png

Are you getting any audio when the circuit is active?

 

[chongmagic]

What I usually do and would recommend in this build, is use my DMM to test each LED before putting in the board. That way I am sure of the orientation and more importantly it is not a dud. My two cents...

 

[fig]

Which type of 9mm pots did you use?

 

[fig]

I have this build on my bench. The metal shaft pots have one or two tabs that need to be snapped off prior to installing…

before…tabs are making contact with 33kΩ resistors

after…still plenty of support and hassle-free!

 

[Thewoodenone]

I have this build on my bench. The metal shaft pots have one or two tabs that need to be snapped off prior to installing…

before…tabs are making contact with 33kΩ resistors

after…still plenty of support and hassle-free!

My pots are all plastic on the bottom and no contact is being made that I can see.

 

[music6000]

Not all LED manufactures use this convention. The LEDs I use as indicators in my builds have the flat side on the Anode.

Robert @ PedalPCB has noted this before also, Bit like the Russian germaniums with ring denotes Anode