The Synth Project Episode 53: Audio Mixer Part 4 - The Panning Unit

How do you turn a mono synth into an immersive stereo experience? In this episode, we design and build the panning stage for our custom audio mixer. We’re moving beyond simple summing and diving into impedance buffering, "PCB sandwich" design, and the math behind smooth stereo sweeps. What we cover in this video: The Dual-PCB Approach: Why separating the sliders from the logic makes for a cleaner build. Input Buffering: Using the TL074 op-amp as a voltage follower to protect signal integrity. The Panning Logic: How a linear potentiometer and a 3-resistor network create a balanced stereo split. Recovery Gain: Implementing a gain-of-2 stage to compensate for passive circuit loss. Live Test: Seeing the circuit in action on the test bed. Chapters: 00:00 Introduction 00:45 Schematic 04:11 PCBs Description 06:25 Test Bed Assembly 08:27 Testing 10:31 Conclusion Link to the archive page, containing all the schematics and other design parts of the project: https://eleneasy.com/the-analog-synth... Link to the complete YouTube series on the project:    • The Synth Project   Subscribe to the channel to receive notifications for every new video I publish, so you can follow all the episodes related to this project. And, please, don't forget to give me a thumb up! Please support the channel by donating through one of the following links: one time donations: https://paypal.me/eleneasy monthly donations:   / eleneasy   Also: Check out my website eleneasy.com, where I publish related articles: https://eleneasy.com/ and my dazzlingsolutions.com web site, where I post blogs related to networking, software, IT and electronics in general: http://dazzlingsolutions.com/ I also have a presence on: Bluesky: https://eleneasy.bsky.social Facebook: https://www.facebook.com/crcarrano/?m... LinkedIn:   / carlo-carrano-32ab7653   Pinterest:   / crcarrano   Quora: https://www.quora.com/profile/Carlo-C... Instagram:   / eleneasy_i   Thank you for watching!