All Questions
21
questions
2
votes
1
answer
220
views
What does a 9 A battery do to a 3 A motor when using the battery for movement?
I am trying to figure out why my battery keeps discharging so quickly. I have a 12 V, 9 Ah (valve regulated) SLA battery that I use on the bench to test motors. I write a small program, test the ...
- 125
0
votes
1
answer
81
views
Battery sizing question
I’ve got a 12 VDC vibration motor. It wants 2.1 A, listed as 30 W.
I’ve also got a 12 V, 12Ah battery I know to be in good working order. Initial current is less than 3.6 A.
Is that something that ...
1
vote
2
answers
556
views
Replacing SPDT relay with MOSFET
I'm having trouble replacing a SPDT relay with a MOSFET circuit.
I have an SPDT relay that serves as an emergency brake of a small motor when the power goes off, shorting both motor inputs.
It's slow ...
- 29
1
vote
3
answers
1k
views
12V DC motor takes substantial amount of current when the direction is reversed
I am working on an underwater ROV. I am running four 12V DC motors using an Arduino Uno and four N-type logic level MOSFETs to control the speed of each motor individually. There are also four 12V ...
- 1,495
1
vote
2
answers
244
views
Can I run a 775 DC motor with DC solid state relay? [closed]
I want to run a 775 DC motor with 12V DC power battery.DC motor link:https://www.nbleisonmotor.com/RS-775-Dc-Micro-Motor-pd6675924.html
I didn’t find any suitable controller for this. The controller ...
- 27
1
vote
1
answer
622
views
How to run a car radiator fan with a PC 450 W SMPS?
I have a car radiator fan which when measured with a multimeter on a 12 V car battery draws 4.7 A. I've been trying to run it off an old PC SMPS which is rated at 450 W with a max. current of 18 A at ...
- 11
5
votes
2
answers
1k
views
Why is 12V Common for PSU
Looking around at various PSUs and I see 12VDC show up pretty commonly, both for PSUs and motors they drive. Can anyone tell me some of the history and/or rationale behind this? E.g. is that a ...
- 153
8
votes
4
answers
4k
views
Is there a way to tell what frequency I need a PWM to be?
I have a 12V DC motor that turns at 60 RPMs or 1 Hz. Do I need a PWM that matches the frequency in order for it to work? Most of the ones I've seen are around 25 kHz for a 12V 20A motor.
- 89
0
votes
0
answers
239
views
why wouldn't a 9-60DCV 20A PWM motor control work to control a 12v 20A wiper motor [duplicate]
I have a question regarding controlling the speed of a wiper motor with a PWM vs wiring in a rheostat in the positive side. I have a 110ACV-12DCV 20A converter going to a 9-60DCV 20A PWM motor ...
- 89
-1
votes
2
answers
2k
views
How to Power 12V DC Motor For 30+ Hours [closed]
First time poster (and attempt at electrical engineering), thanks ahead of time for any guidance!
I am looking to power this small DC 12v 10RPM motor - with the goal of having it run for around 30-40 ...
- 1
0
votes
1
answer
533
views
12V DC Overvoltage Protection
I'm trying to create a air pump system with a rechargeable battery pack. My question is:
Because my air pump is a positive desplacement pump, which task is to create a vacuum in a container, will its ...
- 3
1
vote
1
answer
1k
views
very low stall current in geared 12V DC motor
I bought a small brushed (my guess) DC motor with integrated reduction gears off Banggood: here's the link to the product page:
https://www.banggood.com/12V-DC-3RPM-High-Torque-Electric-Geared-Box-...
- 13
0
votes
1
answer
343
views
Why is this circuit letting the smoke out?
Using this circuit as a proof of concept to run a 12v motor off a 12v wall wart and ultimately use the 5v from the 7805 to power a Particle Photon through Vin pin. This circuit is letting the smoke ...
0
votes
1
answer
2k
views
12v DC motor not running on 12v battery?
I don't know anything about electronics really, it's not my field but I do know that my 12v DC motor should be turning on 12V and it is not. I'm not sure what the problem is really I need help. Is ...
-7
votes
1
answer
18k
views
How much resistance to drop voltage from 18 v to 12 v dc? [closed]
I am going to make a electronic model for my project. I need to drop voltage from 18 v to 12 v for running a 12v dc motor.
So how much resistor i need?
May i use leds in series to drop voltage ? ...
