*Theory and measurement*

• Current drive and speaker distortion
• Capacitor distortion

*Equipment reviews* (NEW!)

• Audiophonics PRE-TC10 preamp with tone controls
• AIYIMA A07 amplifier test with 27V PSU
• AIYIMA A07 amplifier test with 48V PSU
• Purifi 1ET400A EVAL2 mono amplifier test
• Topping B100 RCA mono amplifier test
• A250W DIY power amplifier test
• Hypex NC252MP power amplifier test
• Hypex UCD180HG amplifier test
• SMSL A100 class D amplifier test

*DIY projects*

• OPENAMP1 - MM phono preamplifier open project
• Audio Buffer
• ZT15VA power supply documentation
• ZT15VA power supply image

*Various audio amplifiers*

• Dispre 2-JFET preamplifier (updated 06/2022)
• ULTIM2 balanced preamplifier (update Jan 2023)
• PA4 Power Amplifier
• PM-A4 Class A Power Amplifier
• A250W4R - DIY 250W/4ohm amplifier
• ACCE3 CFA power amplifier
• UcD180HG module measurements
• PMA-NC252MP 2x250W power amplifier
• NC252MP in bridge-tied BTL mode
• Contact