Questions tagged [switching]

Switching can be defined as the change in state whether it be an analog, digital, or mechanical device. For digital devices, switching can be defined as a transition from HIGH to LOW or vice versa. For analog devices, switching can be defined as a change of operation within a transistor. Mechanical device examples include physical light switches or button switches. Ultimately, switching interrupts current from going into another conductor path.

Filter by
Sorted by
Tagged with
0
votes
0answers
146 views

Hot-swap controllers vs load-switch circuits and bidirectional current flow

We've got a battery of 50V connected to a load that may regenerate power, hence a bidirectional current could be present. We'd like to be able to switch on and off the load. We're looking at load-...
5
votes
5answers
1k views

Device to power either a red LED or a green LED

I have a green LED and a red LED. I want a sort of switch to turn either the red LED or the green LED on. For example: Where if the switch is off, the red LED is on but if the switch is on, the green ...
1
vote
1answer
160 views

Please explain MOSFET output characteristics and load line when used as a switch

My end goal is to switch a 9V-12V LED strip with an STM-microcontroller (3,3V level logic). So, I'm reading about MOSFETS (n-channel enhancement type in particular), but I'm very confused about the ...
0
votes
1answer
42 views

Two channel logical switch

I'm trying to make a theoretical automated battery charger using a reactor only with logical gates, and I wanted to use charge cycles between 30 and 80% for efficiency sake. I can output a 0 or a 1 ...
5
votes
1answer
163 views

Output capacitance of MOSFET

I have read in several application notes that there exists a region called the Miller plateau where the current into the Cgd is large such that almost no current enters Cgs holding the Gate voltage ...
1
vote
3answers
78 views

Voltage drop problem. Transistor, optoisolator, relay for programmable Christmas lights?

I'm trying to create programmable Christmas lights - a very simple circuit controlled via Arduino or NodeMCU. My problem isn't on the microcontroller side, but the basic electronics. Now... I have 2 ...
0
votes
0answers
65 views

How I can command the four switches without microcontroller

I try to command 2 SWitch H bridge rectifier (two mosfet two diode) during the positive half cycle M1 switching and M2 be considered as a secondary switch that is continuously ON. During the negative ...
1
vote
0answers
27 views

MOSFET Gate Charge dependance on temperature at HOT, to determine charge needed to design driver?

i am designing this push and pull driver for external NMOS in my buck topology circuit. i am well aware the gate charge ( based on Cgd) i need to turn FET ON and OFF at room temperature based on ...
0
votes
0answers
55 views

How to strobe high power led while maintaining constant current

I am trying to make a high power tv-be-gone. For those who don't know, it uses arduino or attiny to run through every IR power code for most tv brands. I have made regular ones that use several 5mm IR ...
0
votes
0answers
73 views

What should I do to switch off a P-Channel MOSFET as fast as possible?

I have a Power supply that powers circuit A (5V, up to 3A). When the power supply is disconnected I want to detect it and power ...
1
vote
1answer
88 views

High frequency relay options for 5V 20A DC

While researching for a while upon relays, I had a hard time finding out how to choose a relay that can switch high DC currents at frequencies up to 20MHZ. I found those solid state relays, but most ...
1
vote
0answers
88 views

Help understanding the TI TPS22917 load switch

I'm playing around with a TPS22917 load switch on its own (not in a larger circuit), and there are two things that don't make sense to me: When the ON pin is set to low, I see ~0.9 - 1.0v on VOUT. ...
0
votes
0answers
66 views

Fast rise time reed relay

I am currently working on a project related that I asked before here. The purpose is to have 2ns rise time 30ns pulse width at 250V (with 50ohm load). Repetition is 30hz. I tried avalanche transistor ...
0
votes
0answers
64 views

VGSS and Max VGS and VGD in the actual circuit - relation

I am using DMD2005 in one of our designs. In one of the circuit, This MOSFET is used as a simple inverter where Drain pulled up using 10K to VCC which can go up to 15V peak (rarely, typical always ...
1
vote
1answer
246 views

Transistor as a switch for normally closed operation from a Raspberry Pi GPIO

I was hoping to get some assistance with using a transistor as a switch in a circuit that I am working on. The project is to integrate a Raspberry Pi into an old Playstation 2 housing while utilizing ...
-1
votes
1answer
204 views

TRIAC confusion

First for some quick background: You might be aware of my other threads in which I pose a problem with micro-controller to WiFi-command an existing coffee machine which had (as happens with a lot of ...
1
vote
1answer
124 views

PNP high side switching with 100 mA load

I have this circuit to detect tamper status using a switch. When the switch is pressed (ON) then GND is provided to the base of Q3 (2N3906), so that transistor will be in the saturation region and can ...
0
votes
1answer
37 views

How to make one switch control multiple identical subcircuits?

I have an audio circuit with 8 identical subcircuits (one for each voice). In each subcircuit or voice, a resistor controls one aspect of the sound. I would like to have a switch which allows me to ...
3
votes
1answer
66 views

High-side pMOSFET does not switch to ground

This is the schematic in its basic form. It's an nMOSFET that gets driven by a pin of an Atmega328p, this nMOSFET on his turn, drives a big pMOSFET. The source is connected to a voltage regulator (9V6)...
0
votes
2answers
323 views

Miller Capacitance in MOSFET

The above image is regarding the Miller Capacitance present in the MOSFET. I am finding it tough to understand the concept of Miller capacitance. I am trying and researching documents and videos to ...
1
vote
2answers
509 views

Optocoupler to switch 24V using Arduino

I am currently redesigning a circuit to switch a spring applied brake using an Arduino Micro. The current circuit looks like this (please excuse if I'm using wrong symbols, I'm learning by myself): ...
1
vote
2answers
143 views

Stick-Slip Piezo Linear Stage Driver - Prevent the Load from Changing Driver Output?

I am currently trying to develop a circuit that generates ramp waveforms to control the motion of a piezo linear stage. Specifically, two waveforms need to be possible to output: a slow ~250us upward ...
4
votes
2answers
746 views

Reversed DIP Switch

Simple question, why does the LED lights up when the switch is off
0
votes
2answers
142 views

Switching power line phases with inductive load

I have one question related to this schematic: Scenario: Source 1: AC source 220VAC, 50Hz, 120º Source 2: AC source 220VAC, 50Hz, 0º If I want to switch from source 1 to source 2 or from source 2 ...
0
votes
0answers
36 views

Step-down as LED driver leads to flickering

I received a LED driver board that uses an A6902D step-down as regulator. Here the schematic of the driver section: PWM_3 is the signal from the MCU: 500 Hz (tried ...
1
vote
0answers
68 views

Switching ethernet connection without a switch

I want to make a system to configurate ethernet connections to make different topolgies like ring or bus.Using 100baseT. Lets say i have 8 RJ45 female jacks and i would like to connect 1 female jack ...
4
votes
1answer
264 views

DC/DC Switching Converters: Is it possible to run a current-mode converter in voltage-mode only?

DC/DC Switching Converters: Is it possible to run a current-mode converter in voltage-mode only? If so, is there an example using a buck converter? In particular, I'd like to use UC3843 (LT1243) in ...
3
votes
4answers
264 views

Switching gains on a precision operational amplifier using a microcontroller

I need to be able to switch between gain values on a precision opamp in the microvolt region using a MCU. What is the best method to do this? Noise is critical.
1
vote
2answers
91 views

Are “switching circuit” and “circuit switching” related?

"Switching circuit" is a concept opposed to logic circuits. Both are used for implementing digital circuits. The first link says From 1934 to 1936, NEC engineer Akira Nakashima published a ...
1
vote
0answers
46 views

PIN Diode Switching

I am using a Skyworks APD0505-000 PIN Diode as a switch for a bank of capacitors for my oscillator circuit at 4-6GHz. I use the Shunt SPST Switch configuration from the manual, but I can't get the ...
0
votes
0answers
58 views

pmos latch switch

We have a power distribution board for our robot that is responsible for switching power to various modules (controlled via stm32 gpio). The first implementation was pretty simple. we used a high side ...
4
votes
5answers
2k views

Pressing a physical button, but digitally using an Arduino in an existing circuit

I have a pair of speakers that by default select their input as bluetooth and I have to press a physical button (every time I power them up) to switch their input to auxiliary. So I'm thinking of a ...
1
vote
2answers
75 views

DC Relay Module for Switching ~200 VDC @ 1.4A with Arduino Controller

The context of the problem is that I am trying to switch a ~200 VDC Meanwell Constant Current Supply @ 1.4A, to selectively power on a number of COB LEDs connected in series. My initial approach was ...
2
votes
2answers
117 views

A contactor switches 800 amps from two 26 volt batteries in series in a resistive circuit. Can I use a mosfet

The batteries are Lithium Iron Phosphate 26 volts each. There is no inductive or capacative load. The gating circuit should use either the 26 volts or the 52 volts. The switch will operate 8 times per ...
0
votes
0answers
18 views

Is it possible to enable wireless switching between two EV charging circuits using a relay and an ESP32 controller?

I am working on a project where the end goal is to enable bidirectional charging in an electric vehicle. The vehicle is equipped with a unidirectional OBC that connects to the 230V AC mains via a ...
2
votes
0answers
37 views

Reduce switching noise on autotransformer

I am trying to achieve the same thing they are talking about in this post, which is controling an autotransformer via software. I accidently even got the exact same autotransformer, but instead of a ...
1
vote
2answers
93 views

Powering Two Motors through a Three Conductor Cable

I am working on a custom pan and tilt system in which the "pan" and "tilt" motors will be powered with a pair of PWM motor drivers. In other words, each motor will have its own ...
1
vote
0answers
45 views

Two linear regulators from a single buck converter

I have a switching regulator giving 12V and 5 amperes maximum current,and I have a CW7805 linear regulator IC (5v 1.5A ) at its output. The problem is due to my circuit taking almost 1 amp of current, ...
0
votes
0answers
89 views

How to increase the peak current to 12 kA in my circuit?

I am simulating a circuit with a capacitor bank. I am getting maximum peak current to 8.8kA. I need to know how can I increase the peak current to 12-15 kA without increasing the input voltage. The ...
1
vote
3answers
436 views

How to automatically turn off a Fan after a fixed amount of time?

I have an exhaust fan in my bathroom (used for removing the steam generated by a hot bath). Currently, it can be turned on and off by a regular switch. My goal: Exhaust fan should automatically turn-...
1
vote
1answer
101 views

Triac BT 136 not working with load connected to MT1 terminal but working with load in MT2 Terminal

Triac BT 136 not working with load connected to MT1 terminal.. but working with load in MT2 Terminal. Please see the below connection diagram in working and non working cases. If its bidirectional ...
1
vote
0answers
103 views

What switching speed limitations will this H-bridge circuit have?

I would like to use an H-bridge to switch higher voltages (between 5v and 48v using an adjustable linear regulator as the input voltage to the circuit VCC below) on a small piezo electric buzzer (...
0
votes
2answers
60 views

Toggling tilt switch

I’m looking for a simple digital version of the functionality of a pull chain switch, but controlled by a tilt switch. I want to put it into a book on my book case. Tilt the book and the circuit ...
0
votes
2answers
160 views

Make a button to control both AC and 12V DC light [closed]

I want to make a button which control both ac and dc light When button is on If there is Electricity Then AC bulb will be on Else DC bulb will be on And if button is off both ac ane dc bulbs should be ...
0
votes
1answer
168 views

Charged Capacitor discharge into LC circuit (with Freewheeling diode)

With A capacitor initially charged to Vc (assuming ideal diode and ideal switch), I'm curious about determining the max current through the inductor and total discharge time (the switch stays closed). ...
0
votes
0answers
56 views

Fast switching constant current buck output capacitor

I'm using a 1A constant current buck LED driver (the TPS92518 from TI), in order to implement "shunt FET dimming", where the load (1A LEDs) is short-circuited using a MOSFET in order shut-...
0
votes
1answer
73 views

Switching Relay at Zero_Cross Point

I'm controlling 4 Relays(10A) with a controller. While randomly switching it without zero-cross my controller gets restart. To avoid this I'm switching relays at the zero-cross point, But my question ...
0
votes
1answer
98 views

How do I switch a PIN diode using a TTL control signal?

I'm designing a transmit/receive switch for an antenna using a PIN diode. The PIN diode I'm using is UM7512 make: Microsemi. I need to switch between -400V (off) to +5V (on). The switching time should ...
0
votes
0answers
87 views

How to drive led with transistor?

I'm trying to make a very simple circuit to switch an led using a transistor. My supply voltage is 16v, my control signal is 3.3v from an esp8266 GPIO, and my transistor is a 2222a NPN. My led has a ...
-2
votes
1answer
76 views

How do I wire this switching power supply

https://www.ebay.co.uk/itm/124258506002 How do I wire this power supply? It doesn't seem to have any connections and in my mind, it needs two for mains voltage, 2 for 12v out.

1 2
3
4 5
16