Posts re: circuits

• Zero-component switches: PCB resistive touch — Resistive PCB touch pads represent an elegant and cost-effective switch for low-cost PCB design [March 20, 2025]
• How a Differential Charge Pump Voltage Doubler Works — Driving a piezo 4x louder using simple components [March 19, 2025]
• Building a low-cost badge that plays the Imperial March — Driving chiptunes with minimal power and code space. [March 17, 2025]