Amplifier Board Design Assistance
charge si 8 ohm rail more on 80 volt and i want only the output driver stage with feedback also on emitter
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Goal: build only the output/driver stage on ±80 V for 8 Ω using seven complementary pairs of 2SC5200 and 2SA1943 with emitter feedback.
Plan:
- Place 7× NPN/PNP pairs in parallel; add per-device emitter ballast Generic Resistor and base-stopper Generic Resistor.
- Create a Kelvin-sensed summed emitter node for feedback; expose input-from-VAS and feedback pins.
- Add high-voltage driver pair and Vbe multiplier (bias spreader with trimmer) mounted to the heatsink.
- Add output network: Zobel Generic Resistor+Generic Capacitor, and series L//R Generic Inductor+Generic Resistor.
- Add rail and speaker connectors, star ground, test points; name nets and review.
Questions:
- EF2 or EF3 output topology?
- Target idle bias per pair (e.g., low, medium, high)?
- Include VI limiter pads and thermal sensor pads now?
Click Start on the plan bar to begin and I’ll implement this stage.
Clarify topology
Ask for specific values
Emitter feedback detail
Protection options
Thermal/bias details
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