Circuit Atlas · HUSH M4 · Rev 2027.4 draft
S8 Headphone amplifier
Schematic for S8 Headphone amplifier. Design targets and calculations, no measurements.
IN DEVELOPMENT · REV 2027.4 (DRAFT) · DESIGN TARGETS, NOT MEASUREMENTS
HUSH M4 is in development. This draft is published on zakkhutoretsky.com; it has no price and no ordering. Figures marked design target are goals for the finished product. Figures marked calculated come from the published formulas. No value on these pages was measured on a built unit. Interviews are cited as the design brief, not as an endorsement.
See this control Headphones on the front panel key Play the panel
S8 Headphone amplifier
| Item | Value / formula |
|---|---|
| Drive | P = V²/R. 250 mW into 32 Ω needs 2.83 Vrms (4.00 V pk, 88 mA rms); 250 mW into 64 Ω: 4.00 Vrms; 100 mW into 600 Ω: 7.75 Vrms (10.95 V pk) |
| Topology | Op-amp with a complementary emitter-follower stage inside the loop, 0.47 Ω emitter resistors, 10 Ω series output resistorR12 |
| Damping | 32 Ω / 10 Ω = 3.2: a design choice for short-circuit safety, not a high-damping design |