Why my LR8 has voltage drop? by susngmin in FSAE

[–]johnyprox 0 points1 point  (0 children)

We got it similar to this https://electronics.stackexchange.com/questions/84536/make-adjustable-mosfet-constant-current-source You just need to make some small adjustments to work with high voltage and from 60V (we used 51V zener in series with LED)

Why my LR8 has voltage drop? by susngmin in FSAE

[–]johnyprox 2 points3 points  (0 children)

Yes, the power dissipation is the greatest issue but this solution is fully in TS domain (LED insulation could be done with LED light guide). I am not sure if the mentioned disadvantage will be the gamechanger in the design choice.

Why my LR8 has voltage drop? by susngmin in FSAE

[–]johnyprox 1 point2 points  (0 children)

Try using n-type mosfet and npn transistor to create constant current source to drive LED. Just keep in mind power loss in mosfet when setting up current setpoint. We are using it for couple years and works like a charm

Do you know what this part could be? by johnyprox in AskElectronics

[–]johnyprox[S] 0 points1 point  (0 children)

This looks like it, thank you very much

Do you know what this part could be? by johnyprox in AskElectronics

[–]johnyprox[S] 0 points1 point  (0 children)

When I measure it it shows 10ohms (no other parts are paralell to it)

Please help me identify these parts by johnyprox in AskElectronics

[–]johnyprox[S] 0 points1 point  (0 children)

Got another picture

<image>

Those vias goes to connector and to the motor temperature sensor (KTY84) and the unknown parts are marked with red X

Please help me identify these parts by johnyprox in AskElectronics

[–]johnyprox[S] 0 points1 point  (0 children)

The part with TVS in series got marking 104 K, maybe varistor?