Questions tagged [reverse]

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19 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 ...
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2answers
83 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
59 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
57 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 ...
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0answers
54 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
52 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
53 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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65 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
106 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
17 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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24 views

Need help to convert Reverse Engg files to Garber files

i've generated .nod .par .edf .dfx .pdf and many other files from reverse engineering of a PCB. how can i generate Garber from these files?
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1answer
63 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
95 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
662 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
139 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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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
316 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
727 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
979 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
70 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
6k 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
4k 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 ...
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1answer
8k 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 ...