Can I fix this metal detector?

A friend asked me to see if i could get this metal detector working again. Turns out it had a very common problem, and the fix was easier than I expected. For a deeper dive into the theory of metal detectors, Wikipedia has a good article: https://en.wikipedia.org/wiki/Metal_detector If you're curious about the manual for this thing, it's linked from the company's we page here: https://www.pyleaudio.com/sku/PHMD74/Metal-Detector-with-Waterproof-Search-Coil,-Pin-Point-Detect ----- My tip jar: https://www.patreon.com/pileofstuff My other tip jar (channel membership) : https://www.youtube.com/channel/UCRiFz3gNKE3VysarZ7nmqIA/join Buy me a coffee (or a beer): https://ko-fi.com/pileofstuff If you are OK with me getting a commission on your purchases, feel free to use my affiliate links: Ebay: https://ebay.to/33IF7PA Banggood: http://pileofstuff.ca/r/9ajsf Some other links to products may be affiliate links https://odysee.com/@pileofstuff #ElectronicsCreators ----- This isn't the