Questions tagged [reverse]

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Battery pack charging port reverse diode | voltage over charging port pins

I'm planning on building a diy battery out of 18650s, which has a BMS, for a Onewheel. The voltage will be 63v and max load +10A so it will be 15s. There will be an XT90 where the load will be ...
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1answer
67 views

Why are two of the wires in my ignition switch showing reversed continuity? [closed]

My motorcycle manual indicates that when the ignition switch is in the ON position, continuity should exist between the red and brown wires (which it does) and also between the black and black/white ...
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2answers
44 views

SCR crowbar circuit gate voltage?

I'm designing a simple overvoltage / reverse voltage protection circuit for a 24V battery system, with plans to upgrade to a 48V lithium setup in the future. I selected the parts to trigger on a ...
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1answer
41 views

reverse recovery current of 2 different diodes in series

Will the reverse recovery current that both diodes see be the super-position of both diodes' reverse recovery currents?
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1answer
62 views

Momentary switch 12 V motor reverses game

I am trying to figure out how to control a dc motor with a momentary switch as a trigger and limit switches for stops. The trigger needs to be momentary because I need three of them in parallel at ...
2
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1answer
100 views

Is this BJT reverse \$\beta\$ believable?

Looking at the manufacturer's spice model for the Rohm 2SC4713 BJT, I was struck by the high reverse \$\beta\$: BR=123.13 Is a value this high believable or an obvious misprint? Typically BJTs have ...
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1answer
131 views

USB reverse polarity protection - MOSFET

I am thinking about a relatively cheap and simple protection against USB reverse connection/reverse polarity. At the moment I am thinking about P-channel MOSFET, with the drain directed towards the ...
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1answer
47 views

Reverse voltage protection for lithium battery charging module with smd component(s)

I want to add to this famous single cell lithium ion battery charging module a reverse voltage protection: I ended up with the following circuit (Load draws up to 700mA): Sorry, updated: My ...
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0answers
53 views

Using three-phase transformer in reverse

I'm in the US and installing a 45 kVA 480 V/208 V transformer in reverse, to power an electric car charger that requires 480 V. The secondary of the transformer is in wye configuration and I will be ...
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1answer
80 views

Reversed universal universal motor sparks and shows arcing even though brushes are completely perpendicular to the commutator

I need to reverse the rotation of the universal motor in question so I swapped the wires leading to the brushes and that successfully reversed the rotation, but now the commutator is arcing and is ...
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1answer
52 views

PSU reverse voltage protection [duplicate]

I bought a lab Psu device and I would like to use it to charge 1.2v batteries. However the manual says that it's not reverse voltage protected and it might get damaged. After some research I found out ...
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0answers
56 views

Power source switching circuit with load as a voltage source

I want to design a power source switcher for Raspberry Pi Zero. Computer has to be powered from Li-Ion battery when no USB is connected and disconnect the bettery immediately when USB voltage is ...
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1answer
123 views

How does a MOSFET gate resistor reduce ringing? [duplicate]

I desiged P-MOSFET for reverse voltage protection, without gate resistor. The reason that I tend to use it is protect from reverse DC voltage when someone connects the battery. Do I need a gate ...
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0answers
20 views

120v motor with only T1, T4 2 and 8 reversable

This is on an an antique lathe. Someone tried to replace the rotten wire and never got it right. There are 4 terminals on the motor T1, T4, 2 and 8. I expect T1 and T4 will go to line but how to wire ...
2
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2answers
146 views

Reverse polarity protection using back to back NMOS

Designing a circuit to measure short circuit current of a power supply every second. Measurement will be on for about 50ms every second. Heat design has been made for this about of time not constant ...
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2answers
65 views

LED reverse voltage and LED supply issue

I am using LED part number 17-215/BHC-AN1P2/3T which has 5V reverse voltage and 3.3 V forward voltage ratings. I have two questions: As I am applying only positive voltage to the anode and negative ...
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1answer
61 views

Purpose of this Zener diode (reverse protection)

I have the below MOSFET circuit: Zener diode - Datasheet N-channel MOSFET - Datasheet I want to understand what is the purpose of the Zener diode D5202 and at what conditions does the Zener diode ...
2
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0answers
85 views

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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1answer
125 views

Reverse polarity protection for analog input pin

I am designing a PCB with a PIC 16 microcontroller. The purpose of the PCB is to measure the voltage of a button cell battery, before the battery is placed in its device (assume this batterytesting is ...
2
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1answer
71 views

Reduce signal noise detected by accelerometer due to interference from a motor (caused by reverse neutral current)

EDIT AND IMPROVED QUESTION: After working at it, I figured that the problem was that my DAQ is reading the current that flows back into the DAQ through the neutral wire. My DAQ is powered with DC ...
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0answers
154 views

Why or how would a volume pot work if connected in reverse, and how to simulate it?

I've come across a way to connect a regular pot to be used as a volume or gain pot, but the input and output terminals are reversed. It seems that this way of using it is somewhat common in the ...
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1answer
242 views

Positive and negative voltage regulation

This is my first post so please be patient. I need to get three voltage rails, +18v, 0v, -18v and am trying to use a cheap XL6009 voltage boost module to do so. My plan is to connect a 12v line to ...
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0answers
21 views

Do I need bypass diodes when Vout is higher than Vin for an RTC?

tl;dr: I need 3.3v at all times, but it clashes with a secondary switched on/off 3.3v I also need. How can I address Vout being higher than Vin, without feeding voltage back into Vin when I don't ...
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1answer
89 views

BTS441RG Chip Failure When Reverse Powered

I have this circuit that takes in two 24V power supplies and combines them via two BTS441 ProFETs. It then feeds either input A or B to a BTS6163 ProFET which provides protection and monitoring to a ...
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3answers
147 views

BAT60A diode allows reverse voltage

I have designed a board and it can be supplied by USB and/or D-Sub connector. The board gets the 5V from USB or another board via D-Sub connector. I have placed 2 schottky diodes to prevent reverse ...
2
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1answer
792 views

Why does the reverse saturation current not vary with the reverse voltage?

I can understand that in the depletion region of a diode more covalent bonds are broken(more electrons goes to conduction band) with more temperature hence we say that the reverse saturation current ...
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1answer
145 views

Can I drive and reverse this motor with an ESC?

I've just ordered this motor, which I want to drive and reverse using my Raspberry Pi. I've successfully used an H-bridge to drive and reverse a brushed DC motor before, but for this motor I think I ...
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0answers
1k views

Inverse active mode of BJT

Here is my task: Find input voltage Vul and base voltage of T1, so that T1 enters full reverse active mode. Explain. Voltage base-emitter of BJT (when it conducts) is 0.7V, voltage base-emitter in ...
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1answer
363 views

What does a commutator do in dc machines?

It's my exam and in need help I am sure it's reversers current and I don't know my english lecturer say it's no it's provides current I need help please
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1answer
3k views

How is this synchronous AC gear motor being reversed?

I just disassembled the shifter assembly in a washing machine. It uses a synchronous 120VAC gear motor. The motor says "CW/CCW Z.P." It has two leads for the AC power and no other inputs. I ...
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2answers
797 views

Short circuit problem (batteries getting HOT) within circuit

So I am making a circuit with a simple 12v dc motor in series with an NO microswitch and on off switch conntected to a dpdt switch to reverse the polarity of the motor. The first issue I had was to ...
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1answer
1k views

Micro switch off in forward and on in backward

I request some knowledge regarding a circuit I am building. Basic I have a circuit connected to a dc 12v motor and a dpdt switch to reverse the polarity of the motor and a variable potentiometer , I ...
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3answers
77 views

Can I reverse this motor?

For a pet project I want to run a motor and also be able to reverse the direction. I found this motor and pasted the information table below. As far as I know a DC motor needs to be brushed for it to ...
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3answers
7k views

Does reversing polarity in AC damage the equipment? (Sonoff Wifi Switch) [closed]

Firstly, I am a beginner. Excuse me if this is a dumb question. I have ordered a Wi-Fi switch named Sonoff. I have a doubt whether the device will work if the polarity is reversed or will it get ...
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1answer
5k views

How to control the output voltage for the different types of the dc generator?

Generally DC generators are classified according to the ways of excitation of their fields. There are three methods of excitation. Field coils excited by permanent magnets – Permanent magnet DC ...
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0answers
3k views

How can I add N channel MOSFET for reverse polarity protection?

I would like to add a reverse polarity protection circuit to protect my circuit from reverse polarity. I tried to use following circuit at this link With NMOS FET, I have a little problem. If the ...
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1answer
2k views

Using a 3 phase step down transformer in reverse

I have a 30kVA transformer with primary 480V delta to 208V Wye secondary. I am relocating to a building that has 208 service, and would like to use the above transformer in reverse, so that I can run ...
3
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1answer
9k views

Reversing direction of an AC universal motor

The problem: I have a table saw motor I am trying to use in a jointer and need it to spin in the opposite direction (permanently). I have had trouble finding an answer that I am reasonably sure ...