Skip to main content
Electrical Engineering

Questions tagged [reverse-polarity]

Ask Question

For questions about the operation and/or protection of polarized electronic components when biased in reverse. Consider also using the "protection" tag and/or tag(s) for the polarized components in question (e.g. "diodes").

380 questions
Newest Active Bountied Unanswered
2 votes
1 answer
79 views

I am building a device that includes a microcontroller, screen, a TP4056 and an 18650 Li-ion battery. The device can be either powered from the battery or via USB, in which case the battery should be ...
Dakkaron's user avatar
  • 941
1 vote
2 answers
84 views

I'm designing a circuit powered with a 18650 battery, and a CN3791 charger. I'm considering to add a protection IC for the battery. I see there are models like DW01, AP6683, FM2113, XB8089, etc; and ...
tac's user avatar
  • 457
0 votes
0 answers
58 views

How do I convert two 12 V reverse-polarity inputs into one output circuit for powering linear actuator? Reverse polarity dual circuits.
Shawn Anderson's user avatar
  • 11
3 votes
2 answers
168 views

While I was looking at the schematic for the Revolution PI Connect4 open-source industrial controller, I saw this attached reverse supply protection circuit. I don't understand why T101 is connected ...
electroeso's user avatar
  • 35
5 votes
3 answers
732 views

I believe the PCB board may have taken a reverse polarity power input. I can see what looks like a burnt out resistor. Any tips how to identify this component at R20? This is beside the power input ...
C Morton's user avatar
  • 69
3 votes
2 answers
216 views

I'm designing a system that involves multiple microcontrollers all operating at 5V DC, that are ultimately supplied power via USB (also 5V DC). However, components can be rearranged by the end user, ...
Cam's user avatar
  • 133
1 vote
1 answer
128 views

simulate this circuit – Schematic created using CircuitLab Short version: When SW1 is closed, and SW2 is open: will the NPN bipolar transistor Q1 survive? Is there any thing I have to check in ...
Sandro's user avatar
  • 10.2k
0 votes
1 answer
277 views

I have an application for a module in a vehicle, it will be powered by a permanent live from the battery and enabled by the ignition key. I have designed it this way so that I can have the MCU safely ...
Newbie Noob's user avatar
  • 850
1 vote
2 answers
160 views

I'm currently working on a project where I have a circuit that needs to be updated since it needs to have some sort of isolation added to the terminal block inputs to prevent the user from damaging ...
J. Street's user avatar
  • 559
1 vote
1 answer
293 views

I want to use a tp4056 charging module like this both for charging and powering my low power circuit (300uA avg current). The module doesn't seem to have reverse battery polarity protection so i have ...
Konkwistador's user avatar
  • 41
3 votes
3 answers
377 views

I was trying to understand the reverse polarity protection circuit using a P-channel MOSFET. I understand the purpose of adding a Zener diode: for instance, if our supply voltage is 24V and we are ...
Ahtisham A's user avatar
  • 413
2 votes
2 answers
192 views

I am trying to implement this circuit using an LM74700. I followed the MOSFET selection tutorial (available on the datasheet) and there were two good options: IRLB4030PBF and CSD18542KCS. Due to ...
chrisinacio's user avatar
  • 41
6 votes
2 answers
284 views

Consider a depletion MOSFET with the gate tied to the source. When forward-biased, it acts roughly as a current limiter. simulate this circuit – Schematic created using CircuitLab I can't find ...
Davide Andrea's user avatar
  • 33.3k
1 vote
1 answer
168 views

I have a setup where a GPS tracker is connected with two parallel batteries, one is truck's battery and the other is a 12 V dry battery. Upon disconnecting the truck's battery, I needed to disconnect ...
Awais Saeed's user avatar
  • 125
5 votes
2 answers
236 views

I designed a circuit to derive PC817 Optoisolator with reverse polarity protection using a BAT54H Schottky diode. My Schematic is Please ignore the TVS40V component; I used it for ESD protection, ...
Ahtisham A's user avatar
  • 413

15 30 50 per page
1
2 3 4 5
…
26