By: Dominic Sciarrino | Stompbox Electronics | Last Updated: April 9th, 2026 Most guitar effects circuits run directly from a 9V supply with no voltage regulation required. The moment a digital component enters the design (i.e. a PT2399 echo processor, a microcontroller, a DSP chip) that changes. Digital ICs commonly require 5V or 3.3V, and … Continue reading Circuit 9 of 48: The Linear Regulator