Questions tagged [driver]
A chip or a circuit that sends a signal with more current or voltage, or over longer distances.
935
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Relay coil fast demagnetisation
In the past few days, I've encountered an application note on the Maxim Integrated website about rapid demagnetisation of an inductive load:
https://www.maximintegrated.com/en/design/technical-...
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2
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325
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How are such ICs called ? (Level-shifter + CMOS push-pull driver)
A lot of times I need a circuit like below. Namely, a logic level signal should set a higher voltage (e.g. 12 V) and higher current (few 100 mA, but not Amps) push-pull stage to a hi/lo state at ...
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2
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299
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Using LM358 and TIP 122 in a circuit as a constant current driver
I have been working on the constant current driver for a valve. Please find the circuit screenshot below. I am able to observe only 10 mA at the junction where the valve has to be connected. According ...
0
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1
answer
126
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Why is my Multivib piezo atomizer/transducer driver not working?
I'm tying to drive a "Moisturizing Transducer Mist Maker Atomizer Film Plate" using a simple astable multivibrator circuit like this:
I can't make it work. No reaction from the atomizer. I ...
1
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3
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173
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Decoding and connetting a keyboard PCB [closed]
I want to build a laptop from a raspberry-pi and an old "toy laptop" (and new components), the spare toy laptop I have is a Oregon Scientific Batman BL31T. I would like to use its case and ...
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1
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Is designing a PCB for the A4989 driver as simple as the application diagram seems to suggest?
Datasheet
It looks like it just needs an MCU for logic supply, step and direction plus another higher voltage supply; that, along with eight external FETs. Is there a more detailed guide somewhere on ...
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2
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Russian к2лн641 VFD (Vacuum Fluorescent Display) driver pin out help
I have recently acquired some IV-3 VFDs (Vacuum Fluorescent Displays) and they came on an old PCB with drivers. The driver is a к2лн641 and have found a datasheet on it with some information, but it ...
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2
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Driving an LCD backlight using a PNP transistor
I'm trying to turn on/off the backlight of this LCD for the power saving when my ESP8266 goes to deep sleep. Because the ESP8266 has a maximum output current of 12mA and the LCD needs a current about ...
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1
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1
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209
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LCD with PCF8574 I2C driver doesn't work on frequencies lower than 2 MHz (STM32F103 Bluepill)
I am working on a low power project using the STM32 "Bluepill" and I would like to use an LCD without the need to set the frequency for the HCLK (Core Clock) to anything beyond 500 kHz. ...
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2
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Gate driving loss and gate driver for Buck
I have the following question regarding gate driving loss in a synchronous Buck.
When we want to turn on HS or LS we have to charge their input capacitance \$C_{\text{iss}}\$. This is done through a ...
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How to generate opposing outputs at 24V from 3.3V control signal
We have a set of 4 control signals at 3.3V.
For each of these control signals, we want to generate a pair of output signals. For example, if \$control_1\$ is high, then \$out_1\$ is 24V and \$out_1inv\...
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1
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Class E Amplifier Overshooting
I'm having issues getting a Class E Amplifier to work properly. I designed the amplifier based off of Nathan Sokal's paper titled "Class-E RF power amplifier"
https://people.physics.anu.edu....
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1
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188
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Is this a correct 'Bare metal' motor driver? [closed]
I need to make a simple motor driver, I'm using a IRF510 and I wonder to know if this could work.
The circuit - falstad simulation
UPDATE
I added the freewhelling diode as recommended by Tony Stewart ...
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Schematic review of 7x7x7 LED cube driver circuit
I previously made a 5x5x5 LED cube using TPIC6b595 shift registers. I soldered all the components on a perfboard which was rather messy.
I now want to increase the size of the cube to 7x7x7 and adjust ...
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0
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29
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What is the definition of ILac in following diagram and calculations?
The attached diagram and calculations refer to following application note:
AN2761 Application note
Solution for designing a transition mode PFC preregulator with the L6562A
I don't have any idea about ...
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215
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MOSFET driver IR2101 output (HO) stays high
I am trying to make BLDC driver with IR2101. MOSFETs I am using are IRFB4110PBF.
So for testing I am currently using one pair. I am using oscilloscope to see the output waveform. What I see is that it ...
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2
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What's the difference between the D and DTR parts?
Is DTR just the same as D which is packaged in tape and reel? If so, was it really necessary to categorize them like this?
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Is the LED driver output voltage AC or DC?
My LED driver output voltage is 150VDC:
It is also 322VAC:
I checked it with two multimeters.
The input voltage is 237VAC.
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CML pre driver tail node voltage
Please consider the following schematic. I want to understand the V(A) waveform, when D+ & D- are switching.
My understanding is that during the switch, we will have overshoot on V(A), because ...
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1
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LED driver not responsive
I've got a number of HEF4794 BP LED drivers (8-stage shift-and-store register LED driver) daisy-chained together to drive LEDs from a microcontroller. The outputs of the drivers are connected to a ...
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ULN2803A Relay Driving Circuit from ESP-12E through PCF8574
I am designing a circuit which will drive 4 relays & 2 LEDs from 4 push buttons(for each relay) with ESP-12E via (I2C) IO expander PCF8574 as I need more IO's than what are usable(stable) on ESP-...
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1
answer
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Multi led drivers: power line voltage increases after leds switch off
I realized 4 boards from the circuit in attached file based on the HV9961 a constant current led driver controller: http://ww1.microchip.com/downloads/en/devicedoc/20005588a.pdf.
Each stage, powered ...
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161
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differential ADC driver, buffer vs non-inverting amplifier with low pass filter
I am designing an ADC driver (20-bit differential ADC) with an input signal range from 0-10kHz, sampled at 1Msps and with 1 LSB of 47uV. I choose 1Msps rate for oversampling factor of 10.
Referring to ...
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37
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Is it possible to use a Limiting Modulator Driver as an amplifier?
The MTC5525 is basically a Limiting Modulator Driver for driving LiNbO3 modulators, which for me, says nothing, even after googling for 1 hour.
But the seller says it can be used as a power amplifier.
...
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65
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Motor driver current sense does not have the same shape as the sensed current (DRV8874 current mirror)
I am using 3x DRV8874 motor drivers to drive the 3 windings of a brushless AC motor (OUT1 of each motor driver to each winding, such that the current sensed by each driver is not a combination of ...
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1
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79
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Multi "Master "Coaxial Driver Design
I have an application which requires sending PAL video signal & UART infomation over a 50R coaxial cable without disrupting the PAL protocol while doing it, the total length of the cable is around ...
- 426
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0
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74
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Driver output to FET gate voltage - rise & fall time
I have an ISO driver with the following params: Peak source current = 4 A, Peak sink current = 6 A, Sink resistance = 0.55 ohm, source resistance = 5 ohm.
How do I calculate the time between the rise/...
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Which one would be better for 3.3V outputs among ULN2001 and ULN2003?
I intend on driving 24VDC relays with darlington arrays of the ULN200X series. Since the darlingtons will be driven by a 3.3VDC outputs I am hesitating on whether I should choose ULN2003 or ULN2001.
...
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332
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DRV8313 Brushless DC motor controller output voltage to motor is zero
I have installed two DRV8313PWP in a custom PCB and I have followed the schematic in the datasheet to control BLDC motors. After researching how to program them, i have concluded that pins EN1, EN2 ...
2
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1
answer
93
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When using multiple constant current drivers for High Power RGB LEDs, connect Vo- together? [closed]
I'm using a set of three Mean Well HLG-60A-C350AB in order to drive a string of 48 no-name high power RGB LEDs.
I chose these drivers because they provide an easy way to regulate the constant between ...
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0
answers
349
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Linear actuator is not working with BTS7960
I am trying to run a linear actuator with a BTS7960 motor driver and an Arduino UNO.
The code seems fine, wiring seems fine but after uploading the code, the linear actuator does not start.
I am using ...
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0
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259
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Limiting Power in a Coil
I am currently working on a project to make my own coilgun. But a bit unsure of the driver circuit. Typically, a driver circuit will look something like this: Flyback diode and a mosfet being the ...
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1
answer
229
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Using Circuit of Plasma Globe to Power a Tesla Coil
I had this old plasma globe laying around so I opened it up and found what I think is a ZVS circuit(I have ZERO knowledge of high voltage electronics and I may be wrong). I also have a wound tesla ...
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0
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DRV8870 motor driver not powering motor
I am fairly new to electronics.
I am trying to control a single 1.5V encapsulated vibration motor with the DRV8870 motor driver without much success. The motor is connected to the circuit at CN1 with ...
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1
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If I supply more current than needed will my electronics fry [duplicate]
If I have a stepper motor and driver that require 5V and 240mA and I supply 5V at 3A will my circuitry die?
I have heard the expression that a motor "draws" the current that is needs, but I ...
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2
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346
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Do I need a higher amperage power supply for more stepper motors
I have a very simple question:
I am trying to power five 28BYJ-48 stepper motors attached to some ULN2003 driving boards but I am confused about the amperage I need. Each of the stepper motors needs ...
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3
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781
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Multiple Big Stepper Motors on Raspberry Pi
I am fairly new to the world of stepper motors, drivers and RPis, so I might have some potentially naive questions.
Firstly, I am using two NEMA 34 stepper motors and planning to connect them with ...
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1
answer
12
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Which mode to configure MP24833AGN LED driver when we need output voltage higher than input voltage?
The MP24833AGN is a good choice for an LED driver when we have a DC input of 9 or 12 V (or even higher) and need to drive bright LEDs which consume high current like 1A or more.
If your application is ...
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1
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Getting a DC value from this driver circuit
I have this driver circuit that I can't change:
V1 is always 24 V. V2 can be 3.3 V or 0 V.
The output of this driver goes to the board that I'm developing.
If V2 is a PWM, would it be possible to get ...
- 53
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1
answer
621
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Understanding how TFT driver operates (ILI9486)
I'm trying to understand how to interface TFT driver ILI9486. I'm doing this because I want to control TFT display with PIC microcontroller and not AVR (for which libraries already exist). I own the ...
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What does the collector resistor on this LED driver circuit do?
The resistor in question is R2.
The below circuit provides roughly constant current above a certain Vcc.
For R2, I arrived at the value by trial and error by checking simulation outputs.
I would like ...
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2
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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 "...
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3
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510
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BSS138 level shifter causing problems
I have encountered a problem that I am unsure how to solve.
As shown in the image at the bottom of the question, I have an FPGA (Nexys A7-100T) that generates signal to run a motor connected to a ...
- 1,506
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1
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136
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Lazy full-bridge PWM control
I'm playing with a full-bridge driver:
Usually, you want to put an inverted PWM signal on IN1 and IN2 and take care of dead-time.
While writing the code for MCU I tried a simpler pattern:
put a PWM ...
- 1,151
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0
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75
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Control two DC brushed motors with two wires in common
I'm working on a retrofitting project. I need to control 3 DC brushed motors with full H-bridge drivers. In most scenarios the 3 motors have independent connections:
simulate this circuit – ...
- 1,151
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1
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72
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Motor Driver Deadtime, on-switching-time and off-switching-time
I have the following motor driver (DRV8320):
https://www.ti.com/lit/ds/symlink/drv8320.pdf?ts=1616576087660&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FDRV8320
Since I want to implement ...
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1
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35
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Memory row driver does not have enough driving power
I am building the row driver of a piece of RRAM. Different from traditional memory, RRAM's cells are composed of resistor-like elements. I tried using a single inverter and a back-to-back inverter ...
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7
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1
answer
1k
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How to choose the right frequency when measuring coil inductance with LCR meter
I would like to drive a 12V DC hydraulic valve coil using a high side driver (VN7140AJ). The driver datasheet specifies the maximum demagnetization energy (page 24), and I would like to make sure that ...
- 195
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1
answer
147
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connecting teensy + A4988 carrier + motor
I am very new to electronics and I am trying to wire a teensy 3.2 to a A4988 driver carrier and a (unipolar???) motor.
I have zero clue what I am doing but I am trying my best to follow the diagram ...
- 101
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1
answer
2k
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Can Brushless DC Motor (BLDC) be used as Stepper Motor?
I have a BLDC motor and I am keen to know if there is a controller out there that can allow BLDC to be used as stepper motors with (holding torque and accuracy in step size) I know BLDC motors are ...
