Problem with diyKit

Salvatore92 · February 17, 2020, 05:34:41 PM

Hello guys,

I am new to the forum and would love some feedback and help on a diy kit.
So, i bought a parthenon diy kit (pedal pcb). I populated the pcb (except the 2x 1uF caps due to them not being in the components made a bridge instead)), made all the solders and everything seemed fine. Once i plugged the power/guitar/amp the signal came through (when off), once i engaged the pedal, led lighted up but there was no sound at all... Went to check every solder joint etc but saw nothing strange. So what i did was to check with my multimeter the voltages of every component.
So here are the schematics/voltage readings for every component (2 readings, one for each leg of the cap/res/diodes). Would love some help on what could be possibly going wrong.

Thanks in advance

ElectricDruid · February 17, 2020, 05:52:14 PM

If you put wire jumpers in instead of the two 1uF caps, it's not going to work, unfortunately. You need to wait until you've got the caps!

Without the first 1uf cap, the input is pulled down to ground by R2 and the op-amp won't be correctly biased. Unless your op-amps are happy, there's no way *you* can be happy

Have you got any other caps that are close in value you could use? 2u2? 4u7? 680n? 470n?

HTH,
Tom

Salvatore92 · February 17, 2020, 05:54:45 PM

Hey Druid,

So you suggest that everything "faulty" with this build is the missing caps?
If it is so, i will happily bang my head to the wall full-force.

antonis · February 18, 2020, 07:07:58 AM

Tom's "happiness" voltage equivalent..

From IC1 pins 1 & 8 you can verify your op-amp's ability to hit power supply positive rail within 600mV..

duck_arse · February 18, 2020, 08:39:40 AM

antonis, a kit called parthenon, and no welcome?

welcome to the forum, Salvatore92. you need those happy cappy's.

antonis · February 18, 2020, 11:20:51 AM

Quote from: duck_arse on February 18, 2020, 08:39:40 AM
antonis, a kit called parthenon, and no welcome?

Welcome Salvatore..
(despite your kit kitch name..)

Salvatore92 · February 18, 2020, 11:28:38 AM

Quote from: antonis on February 18, 2020, 11:20:51 AM
Quote from: duck_arse on February 18, 2020, 08:39:40 AM
antonis, a kit called parthenon, and no welcome?

Welcome Salvatore..
(despite your kit kitch name..)

Just to state, the kit's name is kitch as hell.
Thanks for the welcoming

tubegeek · February 18, 2020, 12:56:59 PM

Welcome!

ElectricDruid · February 18, 2020, 06:47:56 PM

Quote from: antonis on February 18, 2020, 07:07:58 AM
Tom's "happiness" voltage equivalent..

Exactly! Poor little op-amp! It's not fair to treat them like that!

Salvatore, I don't know if that's the *only* problem, but until that is sorted it's going to be difficult to find anything else.

Salvatore92 · February 20, 2020, 01:41:06 AM

Happy cappies are in place... Everything seems and sounds nice. Thank you guys for the help

ElectricDruid · February 20, 2020, 05:17:12 AM

Well done!

Feels good when it works, doesn't it?!

Salvatore92 · February 20, 2020, 05:19:31 AM

It feels even better when people help you and share their knowledge...

antonis · February 20, 2020, 05:51:30 AM

Quote from: Salvatore92 on February 20, 2020, 05:19:31 AM
It feels even better when people help you and share their knowledge...

Especially when that knowledge deals with emotional op-amps state..

Glad to hear everything works fine now..
(indicating good PCB population & soldering skills..)

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Problem with diyKit