Fixed Coil Whine on Adjustable Output
⚠️ Firmware Update Required: This release includes important firmware changes. Please update your SV241 firmware to version 0.9.10 using the integrated web flasher.
Firmware (0.9.10)
Adjustable Voltage Converter - SC8903 Discovery & Fix
- Identified the buck-boost converter chip: Southchip SC8903 (previously unknown)
- Fixed coil whine/noise when the adjustable voltage output is under load
- Based on SC8903 datasheet: VPWM pin requires 20-100 kHz PWM input
- Changed PWM frequency from 5 kHz (out of spec) to 50 kHz
- Reduced PWM resolution from 10-bit to 8-bit (~59mV steps, sufficient for voltage control)
- Simplified voltage control: Replaced empirical calibration LUT with direct linear formula per SC8903 datasheet (
VOUT = VOUT_SET × Duty Cycle)
- Updated documentation: Added SC8903 chip reference and datasheet link to README
Proxy (0.9.13)
Bug Fixes
- Fixed floating-point precision display issue in ASCOM Alpaca API responses
- Values like
3.4 were displaying as 3.4000000000000004 in client software (e.g., NINA)
- All float responses are now rounded to 2 decimal places
Improvements
- feat(telemetry): Added scheduled database retention and cleanup
- IP address dropdown now filters APIPA addresses
- Moved development guide to proxy README
