Jeff Geerling

Summary

Jeff Geerling is a YouTuber and electronics enthusiast who appeared as a featured guest in the episode "GPS Has a Secret Job." Known in the maker community and recognized for being "obsessed with time," Jeff visited Sean Hodgins's workshop for a hands-on building session where he assembled his first complete surface mount circuit board from scratch. The episode was structured around teaching Jeff to solder the GPS PPS Watch project using solder paste and reflow techniques, marking a significant milestone in his electronics journey despite having previous soldering experience fixing individual components.

During the visit, Jeff participated in Cooking Circuits with Shawn, Sean's theatrical workshop format, though he appeared somewhat skeptical about the staged presentation, at one point questioning "who are you talking to?" when Sean addressed an imaginary audience. His self-described philosophy—"I live my life one extremely accurate second at a time. Nothing else matters"—captures his passion for precision timing equipment and projects.

Background

Jeff maintains his own YouTube channel and is well-established in the maker community. In "GPS Has a Secret Job," he revealed his dedication to precise timing through his "mini rack" setup, a collection of timing equipment that reflects his obsession with temporal accuracy. Supporting this hobby, he owns a collection of 40 BNC cables ranging from 6 inches to 6 feet, which he purchased specifically for his clock rack setup.

While Jeff has soldering experience—describing it as "a good amount"—he had never before assembled a complete surface mount device (SMD) board using paste and reflow techniques. As he explained: "I've done uh I've soldered components individually to fix things, but I've never done a whole board. I've never reflowed one. I've never I've never actually done the paste." This made the GPS PPS Watch Project session a significant learning experience.

Jeff demonstrates technical knowledge across various domains. He correctly identified connector types on sight, recognizing both BNC and SMA connectors and predicting that "the GPS antenna is probably going to be SMA." He also showed familiarity with Control IO 3 U-Blox GPS modules and expressed interest in technical workflow details like KiCad's BOM export integration with Digi-Key.

History

GPS Has a Secret Job

Jeff made his appearance after Sean introduced him with a theatrical flourish, though Jeff immediately corrected the pronunciation: "It's uh it's actually pronounced Geerling." Sean had specifically created the GPS PPS Watch project for Jeff's visit, telling him "I have a very special project for you."

During the build session, Jeff learned to use a vacuum pickup tool for component placement, initially struggling with coordination: "I have to get my foot communicating with my brain there" when dealing with the foot pedal. He experienced the common learning curve with the vacuum tool, at one point exclaiming "I just left it on. I'm like, why is it not releasing?" He also encountered the challenge of losing tiny components, admitting "I lost two" during the assembly process.

The hand-soldering portion proved particularly challenging when Jeff tackled the large BNC connectors, which required significant heat due to their metal mass. He struggled with the task, exclaiming "Holy cow. Come on, man" and later noting he had "some luck holding it up" while working on the difficult solder joints.

Jeff made a design choice to assemble his board with red LEDs on the outside and green in the middle, opposite to Sean's configuration. Upon completing his first full SMD board, Jeff showed both pride and humility: "Yeah, first time complete from scratch. Don't look at the solder too closely."

The climactic moment came when both watches were tested and successfully achieved synchronized timing. Jeff confirmed the lock with "We are locked," demonstrating the precision timing capability that aligned with his interests. When Sean suggested bringing the watches to Open Sauce to "synchronize each other's pulses," Jeff enthusiastically agreed: "I'll bring mine."

Notable Points

Corrects the pronunciation of his last name as "Geerling" when introduced
Describes himself as being "obsessed with time," a characteristic Sean finds "cool, but also maybe a little concerning"
Owns 40 BNC cables of varying lengths (6 inches to 6 feet) purchased for his clock rack
Has his own "mini rack" setup with precise timing equipment
Successfully completed his first surface mount circuit board assembly despite initial coordination challenges with the vacuum pickup tool
Lost two small components during the assembly process
Chose to configure his watch with red LEDs on the outside and green in the middle, reversing Sean's design
Lives by the philosophy: "I live my life one extremely accurate second at a time. Nothing else matters"
Expressed skepticism about the staged "Cooking Circuits" format, questioning the audience
Demonstrated technical knowledge by correctly identifying BNC and SMA connectors and recognizing U-Blox GPS modules
Plans to attend Open Sauce with his completed GPS watch
Maintains an active YouTube channel in the maker community