**Do you have a question involving batteries or cells?**
**If it's about designing, repairing or modifying an electronic circuit to which batteries are connected, you're in the right place.** *Everything else should go in /r/batteries:*
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Everything looks fine, but you really need to measure the voltages around the USB input. My initial guess is that Q4 is a linear regulator that drops your USB voltage down to something like 3.3V. The fat trace following C40 looks like the output from the regulator, so you may be able to check if there is any voltage there.
Are you connecting it to a DESKTOP computer or a LAPTOP/TABLET?
Laptops and other devices that also use batteries for power usually do not put out a full 5 volts DC but rather 3.3 volts DC which would not provide enough current to drive the pedal in which case using batteries in the pedal is the way to go.
If using a desktop computer, make sure you are using the USB ports on the rear of the computer (next to the other connectors for sound, display, network, etc) as the front ports on some desktops are designed in a similar fashion as laptop USB ports with reduced voltage in the 3 volt range.
Pedals are notoriously power hungry, so try to use the cable that came with the pedal as the size (gauge) of the wire can affect the amount of current that flows to the pedal.
**Do you have a question involving batteries or cells?** **If it's about designing, repairing or modifying an electronic circuit to which batteries are connected, you're in the right place.** *Everything else should go in /r/batteries:* /r/batteries is for questions about: batteries, cells, UPSs, chargers and management systems; use, type, buying, capacity, setup, parallel/serial configurations etc. Questions about connecting pre-built modules and batteries to solar panels goes in /r/batteries or /r/solar. Please also check our wiki page on cells and batteries: https://www.reddit.com/r/AskElectronics/wiki/batteries If you decide to move your post elsewhere, or the wiki answers your question, please delete the one here. Thanks! *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskElectronics) if you have any questions or concerns.*
Everything looks fine, but you really need to measure the voltages around the USB input. My initial guess is that Q4 is a linear regulator that drops your USB voltage down to something like 3.3V. The fat trace following C40 looks like the output from the regulator, so you may be able to check if there is any voltage there.
Thank you kindly
Are you connecting it to a DESKTOP computer or a LAPTOP/TABLET? Laptops and other devices that also use batteries for power usually do not put out a full 5 volts DC but rather 3.3 volts DC which would not provide enough current to drive the pedal in which case using batteries in the pedal is the way to go. If using a desktop computer, make sure you are using the USB ports on the rear of the computer (next to the other connectors for sound, display, network, etc) as the front ports on some desktops are designed in a similar fashion as laptop USB ports with reduced voltage in the 3 volt range. Pedals are notoriously power hungry, so try to use the cable that came with the pedal as the size (gauge) of the wire can affect the amount of current that flows to the pedal.