Maynuo M9812
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 | |
| Status | supported |
|---|---|
| Source code | maynuo-m97 |
| Channels | 1 |
| Voltage/current (CH1) | 300W / 0-30A / 0-150V |
| Connectivity | RS232 |
| Features | DC electronic load only |
| Website | maynuo.com |
The Maynuo M9812 is a programmable DC electronic load (300W 0~30A 0~150V) with serial connectivity (Modbus RTU).
See Maynuo M97 series for information common to all devices in this series.
Hardware
Digital control:
- 8-bit MCU with 64 KBytes Flash: Silicon Labs C8051F340 (datasheet)
- 64 Kbits I²C serial EEPROM: Microchip 24LC64 (datasheet)
Precision analog:
- 16 bits ADC: TI ADS8327 (datasheet)
- 16 bits DAC: BB DAC8831 (datasheet)
- Precision voltage reference (2.5 V): TI REF5025 (datasheet)
- Ultralow Offset Voltage Operational Amplifier: 4x OP07 (datasheet)
- Low Noise, Precision Operational Amplifier: 5x OP27 (datasheet)
Output stage:
- Power MOSFET: 8x IRFP250N (datasheet)
- General purpose JFET quad operational amplifiers: 2x ST TL084 (datasheet)
- General purpose JFET dual operational amplifiers: ST TL082 (datasheet)
Temperature control:
Power supply:
- 5 V Regulator: MC7805 (datasheet)
- 12 V Regulator: MC7812 (datasheet)
- -12 V Regulator: MC7912 (datasheet)
Miscelaneous:
- Dual 4-input NAND gate: NXP 74HC20D (datasheet)
- Power MOSFET: IRF540 (datasheet)
VFD controller + panel:
- VFD driver: Princeton Technology Corp. PT6314 (datasheet)
- 8-Bit Serial-In, Parallel-Out Shift Register: Faichild 74VHC164 (datasheet)
- Dual Amplifiers Operational: TI LM358 (datasheet)
Photos
Device, front
Device, front, booting
Device, front, powered
Device, back
Inside
Inside, from front
MCU, ADC, DAC, op-amps
MCU, ADC, DAC, op-amps
MCU, ADC, DAC, op-amps
Output stage
Output stage
Output stage
Current shunt
Power plug
Transformer
VFD controller
