Questions tagged [reverse-polarity]

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Automotive reverse current and transient protection

Adding reverse polarity and reverse current protection to an automotive circuit seems a bit challenging, especially when driving loads in the 10A range (e.g. seat heater). Diodes on the power line ...
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45 views

Protect voltage level translator from reverse voltage input

I have a circuit that can interface with an external signal or power. And Those signal lines must be translated to a 3.3v level (and vice versa) because that what the circuit uses. And I would like to ...
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62 views

Reverse Polarity Question

everyone. I have a really simple power input network like so: The SMPS will power analog devices with +12V and the regulator will regulate the rest downstream to power digital circuitry with +5V. ...
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78 views

Input circuit for MCP3004

I am designing an ADC board for Raspberry Pi using the MCP3004 ADC chip. Please see my circuit below. This circuit is intended to measure voltages form 0 to 10V, to have overvoltage protection (Vin&...
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1answer
163 views

Charging and discharging 18650 batteries with TP4056 modules via their power output terminals

I'm having those fancy ESP boards that come with a battery input pins/holders that can be connected to a battery to make them portable. They also have a dedicated USB port for charging/sketch uploads. ...
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64 views

Looking for circuit, reversing polarity of DC motor

Consider I have 2 inputs, A and B. I need help with a circuit that does the following if only A is active (A,B : 1,0), then the motor should run clockwise if only B is active (A,B : 0,1), then the ...
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60 views

4 6v batteries, with one connected wrong way round?

Today i was working on a machine with 4 6v batteries connected in series. It was in a building that was very dark and the batteries were covered in dirt and i briefly accidently fitted one of the ...
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208 views

Wiring Diagram Help - 6v 'Power-Wheels' Ride-On Upgrade

Hello, I have a 6v Ride On toy car that I want to upgrade to 12v without upgrading the entire electrical system as it is only design for 6v. My issue? I'm not in the electrical trade and i'm trying to ...
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68 views

Want to reverse AC Motor direction - need help

I have this old Westinghouse motor it turns clockwise and I need counter clockwise. It has 3 leads at a junction on the rear, 2 line and 1 middle lead labeled 0. Anyone know how to help? It is a 110v ...
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1answer
69 views

How to wire a PPTC polyswitch + blown indicator LED to protect a bi-directional DC motor from stalling?

I have the following setup and it works well as is, except that I would like to protect the 12V DC motors (Reverse High Torque Permanent Magnet 12V DC motor) with a PPTC polyswitch + a LED to indicate ...
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SIZING steps and Interpreting Mosfet datasheet

After reading those Interpreting Maximum Power of a MOSFET from the datasheet How to interpret Vgs(th) min/max in a MOSFET datasheet? https://www.infineon.com/dgdl/Infineon-...
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DC to LIPO charging module reverse Feedback

I want to be able to use DC 12v to power my circuit but also have ability to have it powered by a battery. The thought I have is: * A on/off switch allows battery output to be switched on/off while ...
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68 views

Mosfet control Rds on , and Vgs

I want to know how to calculate Vgs , assuming load current Id is constant , Vd = voltage of battery is constant , and fet is operating in thermal stability region , so there is no thermal runnawy , ...
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55 views

how to proteus simulation inrush current

i've a reverse polarity protection , i want to check inrush current simulation , but i don't know how . i read this , but i tried but doesnt work How to plot voltage vs current graph on Proteus ...
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1answer
62 views

Zener diode in parallel with both the input terminals and the output terminals

"There is a zener diode in parallel with both the input terminals and the output terminals. Combined with the fuse these should help in reverse polarity situations (it should blow the fuse before ...
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27 views

p mosfet calculations reverse polarity for high power ( 48 V , 30 A )

i want to make reverse polarity protection for input 48 voltage , load 30 Ampere 2 dc buck converters. i was searching many solutions like diodes , but i wanna make it with p fet , so i came across ...
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51 views

How to prevent reverse current/voltage on a sense line?

I'm designing a rocket launch controller, that incorporates an Arduino to provide a safer and more controlled launch. Original rocket launch controllers used to use an incandescent light bulb and a ...
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1answer
59 views

Solar LiPo battery charger: revision and improvement of the reverse voltage protection circuit for the battery

I am designing a solar charger with MPPT for a 1-cell lithium polymer battery of approximately 6000 mAh. The solar panel is 10W and 21 Voc. I am trying to ensure that the charger has protection ...
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83 views

Reverse Voltage Protection with feedback circuit

I would like to understand on the feedback transistor circuit in the given reverse voltage protection circuit. Voltage Input: 7V to 32V.
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140 views

Reverse polarity diode, which diode is better: SB140 or 1N5819

I want to add reverse voltage polarity protection into my circuit to protect the components in my Arduino robot. But i want to know which diode has the edge on the other: SB140 or 1N5819? Or is there ...
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113 views

Reverse voltage protection for TBD62083

Good day everybody. This is my first question on this site so bare with me :) . I am working on general purpose driver using TBD62083 (replacement of darlington array ULN2803). As you can see the ...
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27 views

Mixing Reverse Polarity Protection PMOS with a Piezo Element

I have a circuit that powers some leds when vibrations are detected. I am trying to integrate a PMOS for reverse polarity battery protection. When the PMOS is present the circuit simulation fails as ...
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1answer
76 views

Using P-MOSFET with Gate and Source have same voltage to protect reverse current

I have a question when I am working on MP2639A 2-cell LIPO charger (+8V4) from USB +5V. The recommend schematic uses P-MOSFET to protect reverse current from Load back to a USB plug. taken from ...
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119 views

Reverse voltage on MIC5225 in particular and other LDO in general

This question has been asked many times before, for example about LD1117, MCP1703, LM78M05CT, MIC2920A, ADP7142 etc. Why am I asking it again? a) From reading all those topics it seems that the ...
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1answer
604 views

Have I fried the transistor in this circuit?

It was a germanium PNP transistor. I might've pressed the button too. I saw transistors used as capacitors that were connected like this, but they weren't germaniums. What current (if any) has flown ...
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58 views

Low Side Reverse Protection Diode + Wide Battery Input Range

Quick background: I'm working on a very wide input range for a battery powered application (capability for two different types of chemistries). In the original design, a low side NFET was used as ...
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1answer
89 views

High Side Driver IC - Application Information

I have a question regarding VN5025AJ-E: High side driver IC. Datasheet link - https://www.st.com/resource/en/datasheet/vn5025aj-e.pdf In the figure you can see the application schematic. In the ...
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1answer
58 views

How to deal with extra pins on reversible connectors?

I want a header on my board to be reversible. The header has 4 UARTs, 4 power pins (VA,VB,VC,VD), and power (3V3) and PWM for a servo. The functions of most of the signal pins of the header are ...
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267 views

NMOS Gate RC Filter Values

I am designing a Reverse Polarity Protection circuit for a project by using an n-channel MOSFET. A basic schematic is shown here. I've added an RC filter so that the voltage on the Gate pin changes ...
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83 views

How to connect a generator and LED device of different polarities?

I have a device that generates light impulses when connected to a LED device. The intensity of the light is regulated by a potentiometer, within the generator. There are 2 independent channels. The ...
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3answers
74 views

Using two switches to each send current in opposite directions

I have two momentary switches, one to activate a solenoid and one to reset it. It is only possible to press zero or one of the two switches at the same time. Using a single battery, how can I wire the ...
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103 views

Reverse polarity protection non-isolated power supply

I'm trying to design a circuit with reverse polarity protection. I have found numerous of examples but I can't get it to work for me with a non-isolated power supply. I'm open for suggestions. I ...
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369 views

AC L+ and N- difference

Hey guys i'm on a project in which I have to use Safety Modules. I'm confused with the pin-out diagram of the safety modules. They reference L and N lines of an AC source. I'm leaving you the data-...