Wednesday 6 November 2019

relay - Bidirectional Logic Translator translates to 2.8V instead of ~5


Considering the below PCB with the following scheme, with components inserted, with DC+ connected to a relay's DC+, DC- to DC-.


When CH1 is connected to the relay, the voltage between HV1 and HGND is ~2.8V.


When CH1 is not connected to the relay, the voltage is, as it should be, ~4.8V.


The relay is a solid state high level trigger.


The bidirectional logic level translator is of this kind.



I tried this with different logic converters, and different relays, but the behavior is the same, what could be the problem? I'm struggling with this for some hours and I can't figure it out.


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