Questions tagged [remote-control]

For questions related to the remote control of devices and the design of remote controls.

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Can you charge a multi cell LiPo battery only using the balance lead socket?

On a typical small LiPo battery charger like the one in the picture, can you charge a multi cell battery (like the one bellow) only using the balance leads without using the main/output charge lead? ...
Gabe's user avatar
  • 151
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3 answers
50 views

RC delay timer to power LCD

I'm looking turn on the power of an LCD screen from a Pi Pico with a short time delay (50-100ms) after the Pico is plugged in. I want to power the screen with VCC from the Pico (5V) and use a signal ...
printsmith3d's user avatar
0 votes
3 answers
103 views

Charge Capacitor at 5V from 3.3V Microcontroller Pin

I must come up with a circuit that is able to charge a capacitor to 5V that I can drive through a GPIO of a microcontroller running at 3.3V. The capacitor is in a different device and has a leg ...
SukkoPera's user avatar
  • 191
1 vote
1 answer
65 views

Does it matter in sensorless BLDC motorcontrol if a motor is wired in delta or in wye configuration?

Let's say I am designing an ESC for a sensorless BLDC RC motor and I don't know it is a wired in wye or delta, does it matter? Delta doesn't have a neutral point. So if I would want to use BEMF for ...
Luuk Benningshof's user avatar
0 votes
2 answers
97 views

RC response for any given voltage [closed]

Lets imagine a simple RC circuit in which the response voltage is defined by the following equation: $$ V(t) = V_{inf} \cdot (1-\exp(-t/\tau) $$ This is only true when a constant voltage is applied (...
Gerard Carrera Cardona's user avatar
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2 answers
87 views

Issues with unintended output activation in RF module circuit [closed]

I'm encountering problems with my RF module circuit for a cold pyro igniter using HT12E: Unintended Flash on Power On:When powering the receiver, the output flashes without button press. Continuous ...
johnson veigas's user avatar
1 vote
0 answers
341 views

Custom radio modules/frequencies for ELRS

I'm trying to develop a custom RX/TX for UAV piloting on a non-standard frequency. I tried decoding CRSF from the remote control, connecting to the S.Port etc., but without much luck. I figured out it ...
Secret-guy's user avatar
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1 answer
43 views

Control manipulator mechanical arm by infrared

I want to make an infrared control circuit (remote) connected to the Manipulator Mechanical Arm. I found this circuit, but the outlet is 230 volts, and I do not think that the arm will handle this ...
Mohammed Al-Elaiwi's user avatar
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0 answers
59 views

Trouble understanding resulting bode plot while getting hands on filter design

Recently tried to get hands on filter design, I tried to design à simple low-pass RC filter as shown here. simulate this circuit – Schematic created using CircuitLab Cutoff frequency must be \$\...
aQ9's user avatar
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1 answer
170 views

Voltage Sag in Li-ion batteries, And how to reduce them

I have 3 18650 Li-ion cells connected in series. Each have a capacity of 2200 mAh and can discharge at 10C. First of all , tell the maximum amps I can draw from them. If I am not wrong, I can draw 22 ...
S.A's user avatar
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7 votes
3 answers
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Unphysical voltage in SPICE simulation

I was exploring a lumped approximation of a distributed RC network (sort of a lossy RC transmission line/ladder network). Everything made complete sense until I observed the voltage "gain", ...
lukas123321's user avatar
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47 views

Designing a Delayed Load Switch Circuit for Voltage Transfer on a PCB

I am seeking guidance for the design of a circuit on a PCB board. The intended function of this circuit is to facilitate the transfer of a 24 V voltage from the input to the output through the ...
Knowledge's user avatar
  • 401
1 vote
0 answers
206 views

Differences between "Dark Current", "Sleep Current" and "Quiescent Current" in automotive related products

I am from automotive electronics tier 1 manufacturing company which makes Automobile locks and Remote keys. In our remote keys, our team uses the term "Dark Current" for the default current ...
Mandeesh Singh's user avatar
0 votes
1 answer
81 views

How to generate a single pulse circuit without using any MCU? [duplicate]

I have a 5V supply to turn my circuit on, and i need a one pulse circuit. The condition should be look like this; When the circuit energized with 5 V it should go low after t1 time and it should stay ...
Ufuk Özgür's user avatar
2 votes
1 answer
76 views

Introducing RC Filter to reduce noise

I have designed a constant current circuit using an opamp. If I want to implement an RC filter to reduce the noise, where can I add? Option1: I am planning to add between the inverting terminal and ...
Teena's user avatar
  • 101
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2 answers
33 views

How to draw the curve of the charge Qc

How to draw the curve of the charge Qc as a function of time for an RC circuit, whose capacitor is initially charged and without source, when closing the tap
Blanca Prieto's user avatar
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2 answers
88 views

Homemade Doorbell - Issues with transistor and battery

I'm making a doorbell and i've tested it on my breadboard where it works perfectly fine. However, when I transfer it to a soldered circuit I have some issues. The switching of the transistor is ok, ...
Aleksander Lauridsen's user avatar
2 votes
1 answer
210 views

Why isn't this IR NEC signal being accepted by the receiving device?

I'm trying to transmit an IR NEC signal to a portable air conditioning unit. I have the remote control that came with the unit, and it appears to use the NEC IR protocol. I've setup a receiving ...
John O'brien's user avatar
0 votes
1 answer
88 views

Need help to find the natural response of an RC circuit

Here is the question I am trying to solve: I am stuck with the point that I am not sure Vo is found as -50v or +50v. Another issue is that Ic(t) is calculated by derivative formulas or another simple ...
Computengineering's user avatar
1 vote
2 answers
94 views

Why are most of the LED lights for living dimmable just by their remote (they do not work with a wall dimmer)

I am trying to replace the lights in the entire house with LED lights with a more modern style like this one https://www.amazon.ca/dp/B09582MM2J. They all use LED strips and they say they are not ...
MiniMe's user avatar
  • 111
1 vote
3 answers
68 views

TP 4056 + XL6009 for RC cars

Good afternoon. I use 18650 to power the radio machine. An XL6009 is connected to the output of the TP 4056 board to receive 5V, and then these 5V are fed to the machine board. But you press start on ...
Oleg Red's user avatar
1 vote
1 answer
126 views

Combining multiple motor controllers into one

This question is in continuation of my earlier question. I have four motors with individual controllers connected as shown in the diagram below. I would like to create a controller that can control ...
Tomalele's user avatar
0 votes
0 answers
81 views

How can I controll the speed of a coreless motor with an RC receiver?

We used a brushed ESC 1A 5V (0.4g) DSM-ESC001 (unable to find its manual) for controlling a coreless 614 motor with 8mA no-load rating with an FS-X6B receiver. After checking some things out, the ESC ...
Ijaz Ahmed's user avatar
1 vote
1 answer
376 views

Does the remote control we have at home work with infrared (IR) frequency?

Picture source. I was told by my AC's technician who several times came to my house to fix my air conditioner, especially if it got problem with the remote control or the board on the AC equipment. ...
AirCraft Lover's user avatar
0 votes
2 answers
64 views

RC timing circuit using a 2N3904

I have a 12VDC source driving an LED thru a 2.4K resistor. When a 12VDC control turns on I want power the base of a 2N3094 thru an RC network to drop the LED voltage to 0 in .5 to 1 second. I ...
D Trimble's user avatar
1 vote
2 answers
102 views

Terminated RC filter

Few days ago I asked in another thread if there was an easier way to get an expression for a transfer function of the circuit shown below in a form H(w)=H(0)*N(w)/D(w). I wanted an analytical ...
Susu's user avatar
  • 11
0 votes
1 answer
138 views

Can I use a power bank which shows output as 6V 9V 12V to run an RC car which uses 6 AA batteries? [closed]

I'm currently stuck at home and found an old RC car which uses 6 AA batteries. Buying new non rechargable batteries everytime i play with it is gonna be heavy on the pockets. I thought maybe if I can ...
Jerin C Mathew's user avatar
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0 answers
63 views

AC Source RC Circuit Differential Equation

I have to find the differential equation to this circuit and I have been stuck for two days. I have tried: KCL in loop 1 and loop 2 but I don't know how to do the current through the inductor as Vi(t) ...
spyingU2's user avatar
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0 answers
47 views

Can I modify a toy RC transmitter?

I'd like to modify a cheap supermarket RC toy car to go reasonably slower for extended run time and easier control. (would be present to a kid) I have not bought or even selected the toy in question, ...
Dan's user avatar
  • 13
1 vote
1 answer
78 views

Hacking an RC car controller using an Arduino to electronically control an RC car from computer [closed]

I want to control an RC car from my computer so I can link my RC car with my racing wheel and pedals. To do this I was planning on modifying a dumbo X6 controller and connect an Arduino to it by ...
mr. someone's user avatar
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0 answers
32 views

Adding external parts with heat sink to increase max current of SimpleFOCMini driver (DRV8313)

Question: Is it easily possible with some external MOSFETs or similar things to increase the max current the DRV8313 can handle per phase of a 3 phase BLDC motor? Will be 3 parts enough, or would I ...
mangiari's user avatar
6 votes
3 answers
706 views

Using an RC delay circuit on an NPN BJT base

I have a limited knowledge about BJTs used as amplifiers, but I know there is a voltage regime where the BJTs amplify, below saturation. I am wondering if I put an RC delay circuit on the BJT's base ...
Feynman137's user avatar
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0 answers
43 views

New Idea: On/Off Remote for iPad - but iPad can't boot! Suspect SENSE

I am installing a mini remote controlled switch in the iPad 8th Gen. The ideas is to be able to cut the power to the iPad at the battery using a remote control. 1st attempt: I wired up the remote ...
heyyy's user avatar
  • 1
0 votes
0 answers
80 views

Power circuit for 3 AA batteries for ATtiny85

I'm using an ATtiny85 and 3 AA batteries in series to create a DIY remote control. Does anyone know what kind of circuit I need to safely and correctly use the batteries? I assume it'll need some ...
1W0n_29's user avatar
  • 21
4 votes
2 answers
1k views

I need help understanding a Chinese datasheet on an IR remote IC

I have a remote for a sound system sub woofer (a quite expensive, set I would say) with 16 buttons and half of them suddenly stopped working. A broken remote is not usually the end all, but the people ...
DrakeJest's user avatar
  • 887
1 vote
1 answer
128 views

What is the name of this connector and where can I find it?

Any ideas on where I can locate this connector? It is from a bike light and connected directly to 18650 battery. 3mm x 2mm with 4 holes, but 2 wires from the battery. On the motherboard the connector ...
dmas72's user avatar
  • 11
0 votes
1 answer
141 views

RC circuit - Vc(t) calculus from integral with defined integral constant

I have 2 questions : From this i get differential equation : I get 1) Can I say that : 2) Or, maybe for complex circuit, I have to play with contants like that :
user7058377's user avatar
0 votes
0 answers
62 views

Foldback current limiting in RC servo application

Background: A 7.4V 2Ah battery (LP-E6 from Canon) powers our system (camera/laser mounted on a one-axi gimbal). The gimbal motor is an RC servo (HPS AA701 from Futaba) connected directly to the ...
AyubowanPro's user avatar
0 votes
0 answers
98 views

Motors latching on - diy RC car

I am building a little diy RC car/robot from salvaged parts. Here is what I am using: Chassis and motors from an old RC car. They are normal hobby/toy motors. MX1919 motor driver from something (...
Codachrome's user avatar
1 vote
0 answers
39 views

Remote Control Plane Transmitter Question

More so of a rc plane hobbyist, so never messed with the workings of the receivers or controllers. I am looking to help with the situation in Ukraine. Building long range search rc planes as most of ...
vipr08 's user avatar
0 votes
1 answer
100 views

What do you call the clear adhesive film used to shield electronics?

I am a newbie and am just trying to fix the remote control for my electric fireplace. I am trying to replace a peanut butter dome button with a contact switch. Between the cover and the PCB board ...
bnieland's user avatar
  • 101
0 votes
0 answers
68 views

Looking for a remote switch triggered by brief power off then on

I'm looking for a "remote switch" that can be turned on by a brief interruption to the power supply. Scenario: I have 2 lights on 1 circuit. I cannot run wires back to the main switch but I ...
Peter Smart's user avatar
4 votes
1 answer
342 views

Stumped - part identification

My nephews recently gave me back my old Remco Thunderhawk RC racing boat and asked me to "fix it". I've dabbled in some electronics but nothing in the RC world. My first step is to identify ...
JBL's user avatar
  • 49
0 votes
1 answer
60 views

Ideal Voltage Source Short Circuited in exam problem

V2 in the diagram is the same as Vin,so it is not 5V constant but it follows the graph. In an exam question I was given the circuit depicted in the image.The prompt went like this: In the circuit ...
NicholasAgg21's user avatar
0 votes
1 answer
259 views

How to calculate cut-off frequency of an RC High Pass filter with two resistors?

Please consider the attached circuit. How would I calculate the cut-off frequency here? Should I treat resistors as attached in parallel? This is an actual circuit of an existing device, I cannot ...
Jimmy Falcon's user avatar
0 votes
1 answer
117 views

BLDC motor and bullet connectors getting hot

I am using the following components: Lemon RC 3S-2200mAh 25C/ 50C (burst) LiPo battery Readytosky 80A ESC DYS D2726-6 BLDC (2200kV BLDC motor) I am testing out the components with 1045 (10 in, 4.5 ...
Keshav Totla's user avatar
1 vote
1 answer
441 views

How to fix the keyless key (replace the antenna) of Mistubishi Outlander?

Background story: I had a keyless keyfob for my Outlander, and lost it. I went to the service and they configured a new key for me. The serviceman told me that many times when the key falls the ...
Aminadav Glickshtein's user avatar
-1 votes
1 answer
69 views

Find time in RC circut with known C and R

In a series RC circuit with a voltage source the Capacitance(15uF) and Resistanse(22.4ohm) is given. The time at which the Voltage across the resistor is same as the voltage across the capacitor is ...
denizyildiz70's user avatar
0 votes
1 answer
65 views

Positive and negative voltage readings across a rig simulating bearing contact, supplied with a DC source

I recently ran a few experiments to simulate the effects of shaft voltages on motor bearings through using a simplified experimental rig. The rig simulates bearing contact. I applied a DC source ...
Mrcemify's user avatar
4 votes
1 answer
1k views

Positive and negative overshoot mitigation

While tuning a 12.5 MHz 3.3V signal (square wave expected 3.3V to 0.0V,) I am seeing overshoot reach of +5.0 V and negative overshoot of -2.0V. I am intentionally not using the term undershoot here as ...
AKR's user avatar
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