No power to FV-1, beginner and need help

[azaheltorres05232007@gmai]

Bought the Arachid pcb and started populating the board. Initially it wouldn’t work either until i accidentally bumped it and held it at a specific position did it work but bumped it again then it died. Now i cant figure out what went wrong? I used a multimeter and checked that the FV-1 was getting power but was drawing almost 1v but stayed around 0.3-0.5 for most the time. Voltage regulator also reads 3, 0, 7 for pins respectively and the power in from the battery is also 7 volts. Would like some advice both brutally honest and constructive since it’s my first time attempting a project like this. Also bridged some resistors since I messed up some of the pads while soldering. Bypass and led are about the only things that work.

 

[jwin615]

It sounds like you have polarity reversed or D100 is shot or both.
Gonna need to check the regulator once that's sorted.

 

[azaheltorres05232007@gmai]

It sounds like you have polarity reversed or D100 is shot or both.
Gonna need to check the regulator once that's sorted.

If you don’t mind me asking what’s the D100? and the polarity of what exactly do you mean one of the diodes? thanks for the reply

 

[PJS]

I can't see a crystal (X1) installed. The FV-1 won't work without that. Also, you need to redo a significant amount of the soldering. It looks as if most of the legs of the voltage regulator are not soldered at all, which won't help with powering the chip. Probably not an issue with functionality, but in future wherever you can socket the ICs, so if there is an issue and they need replacing it is easy to do without having to desolder all those legs. In this case you can't socket the FV-1, but the op amp and the EEPROM can be socketed.

 

[jwin615]

Yah. No clock no work. Though you should get dry through even without the FV1 working.
D1, sorry. Check D1.

https://docs.pedalpcb.com/project/Arachnid.pdf

You should be getting 3.3v out of the regulator.
But if you are getting 3v, D1 is likely fine.
Get your X1 installed. And maybe a new battery, though this pedal probably won't run very long on battery.

 

[andrewsrea]

Like @PJS said, it isn't going to work without the clock (37.768KHZ crystal). The solder of the '+' looks wonky.
in the future, socket all transistors & DIP ICs. I also tend to socket clipping diodes as well, to allow for auditioning variants.

D100 looks oriented correct to the one I have. D100 is a diode placed in-line with the +9VDC power supply, to prevent damage from having the DC input polarity wrong (inverted).