720 B
720 B
tags, created
| tags | created | |
|---|---|---|
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2026-07-08 17:24 |
Summary
Each board contains four identical circuits using BSS138 MOSFETs. The ground pins are not connected to the circuit in any way and are not needed for it to function. A low level output is sinked through the corresponding input signal (MCU GPIO pin). A high level output is sourced through the corresponding Vin pin (LV or HV) through a 10k resistor. If an input is left floating, the corresponding output will go high. If using unidirectionally you can put a strong pull down resistor (1k) on the input side. A pull down on the output side will cause malfunction.
References
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