Linked Questions

30
votes
6answers
255k views

Reducing voltage with resistors

I have been looking around for an easy way to convert 12V to 5V. I have seen some people saying that a simple resistor is all that is needed. $$ Volts = Ohms \cdot Amps $$ $$ Amps = \frac{Volts}{...
34
votes
2answers
12k views

L293, L298 and SN754410 H-bridge drivers on low voltage power supply

This question is about the following three integrated H-bridge drivers: - L293 or L293D (D = protection diodes added) SN754410 (protection diodes included) L298 (no protection diodes) Time after ...
2
votes
5answers
665 views

Why is my PWM efficiency about 50%?

I'm using a BTS7960 module with an Arduino to adjust the voltage for my DC motor. When I check efficiency there is a problem. PWM efficiency is supposedly about 90% but mine is only about 50%. I ...
3
votes
2answers
2k views

3V power rail from 5V

I've mistakenly ordered some 3V PIC18 L F14K22 instead of the 5V 18F14K22. 3V output is fine for the designed circuit but I need to make a 3V power rail from the available 5V rail. Since only a ...
2
votes
1answer
4k views

Correct PWM frequency for motor [duplicate]

I am using 4500 RPM motor.To be specific,this is the motor I am using https://www.robomart.com/4500-rpm-high-torque-dc-motor. I am using Cytron MD10C motor driver to drive it.The PWM source is ...
2
votes
2answers
1k views

How to troubleshoot a DRV8833 motor driver module problem?

I am trying to control a DC Motor with a DRV8833. To be precise, I have this module from MJKDZ (which, I believe, is not the original one from TI). I measure the voltage on the input pins, they are as ...
3
votes
2answers
541 views

Anything wrong with connecting L298Ns in parallel?

Although L298Ns are very inefficient, they're very cheap. I have two motors that require 4A+ current at load combined. Can I connect multiple L298Ns in parallel in this way to increase the overall ...
1
vote
2answers
224 views

How does this modified H-bridge circuit work?

I am trying to design a circuit which will have as an input a single microcontroller pulse which will cause a circuit with two 555 timers to output two consecutive pulses which are able to have their ...
0
votes
1answer
606 views

INA219 current sensor not working properly with DC motor

I use INA219 module to read DC motor current for control propose. I connect INA219 in series with motor as shown in schematic. simulate this circuit – Schematic created using CircuitLab The ...
1
vote
1answer
281 views

Difference between h-bridge, dual half bridge and quad half bridge

Note: I am beginner. I'm looking at motor drivers on this website Various motor drivers have different specification for output configuration, i.e. :h-bridge, half bridge, quad half bridge and PWM. I ...
2
votes
1answer
200 views

Motor Driver keeps dying/frying driving a worm gear motor

I am looking for some consultation about controlling a24VDC worm gear moto. I have blown 4 h bridge motor drivers thus far and while I have been trying to keep my project price tag low I may need to ...
1
vote
2answers
593 views

Is it necessary to use a pull down resistor with this BTS7960?

I have an Arduino Nano controlling a BTS7960 that is 10 meters away. I have one 24V power supply. Both the Arduino and the BTS7960 get 5V through a an LM2596 step down converter. The BTS7960 "...
1
vote
2answers
186 views

DC Motor, Torque vs RPM

I am making a pulley system (for an electric bike) that requires about 300rpm and 40lb-inch torque. The motor that I am looking at is a 24V DC Permanent Magnet Electric Motor Generator 250W 2750RPM ...
1
vote
2answers
238 views

Fake microstepping in A4899 and LV8729 stepper-drivers?

I built a test jig to experiment with a friend's 16-pin A4988 stepper driver, and even added bi-directional LEDs to the outputs and, regular LEDs to the inputs, to see if it behaved as expected. By ...
1
vote
1answer
72 views

How to get fine DC brush motor speed regulation?

I want to get a fine speed regulation of Pittman DC 24 V brushed motor with 10,000 RPM for a hobby project. The voltage I will use is battery 12 V DC, so does that mean the speed will be 5,000 RPM? I ...

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