I used this ebay unit: 5A Adjustable CC/CV Display Step Down charge Module LED Panel Voltmeter Ammeter
Specifications :
- Module Properties: non-isolated constant current and voltage module
- Rectification: non-synchronous rectification
- Input voltage: 5V-32V
- Output voltage: 0.8V-30V
- Output current: adjustable maximum 5A
- Conversion efficiency: 95% (the highest)
- Switching frequency: 300KHz
- Output ripple: 50mV (max) 20M bandwidth
- Load Regulation: ± 0.5%
- Voltage Regulation: ± 2.5%
- Operating Temperature: -40℃to +85℃
- Measurement accuracy: 0.1%
- Refresh rate: about 200ms / times\
- Display: 0.28"digital tube
- Current Range 0A-5A
- Voltage range 5V-30V
- Display Color Red (I love those red retro 7 segments)
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