Tagged Questions

Devices to interrupt or route a signal or power one of several ways.

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0
votes
1answer
33 views

Use Arduino for switch a 12v powered remote control

I've a remote control powered by a 12v battery. I need to switch a button using arduino, can I use directly the digital pin without any relay or transistor? Thanks in advance
1
vote
2answers
80 views

MOSFET source to drain Current

Since similar kind of questions being asked before it.. They doesn't clarify how one can use it in circuit. I'm aware that a MOSFET is a bidirectional device and in one direction current can flow ...
1
vote
2answers
47 views

Trying to identify this rocker switch in a KRK speaker

I am trying to replace a broken (the rocker arm was pushed in) rocker switch on a KRK V4 speaker, and am looking for a suitable part number. I don't see a number on the switch and don't want to take ...
3
votes
1answer
448 views

Turn 9V device off using 3.3V logic level signal

i'm facing the problem to turn a 9V (battery) powered device OFF using the output of a 3.3V based microcontroller. To do this i already threw together the following circuit (which works - assuming i ...
1
vote
2answers
160 views

Jack barrel contact diagram?

I've come across this diagram, I researched a bit, but I don't get what this contact is supposed to do. The circuit below is an audio effect, and I'm confused because it apparently doesn't mean that ...
2
votes
3answers
58 views

Which diode to use on my RC switch debounce circuit?

I am choosing parts to build an analog RC switch debounce circuit. I plan to implement the circuit described here: http://www.ganssle.com/debouncing-pt2.htm (see "An RC Debouncer"). These are the ...
0
votes
1answer
68 views

Inductor held with hands

I have a fairly simple problem, but as I am a newbie in electrical circuits I was hoping someone might help me understand the principles of things. I have a circuit with an inductor of L = 0,102H a ...
0
votes
0answers
40 views

How to control a bulb operating on 230v using a switch operated at 5v

Hello Electrical engineering community, Maybe this is an easy question to answer but I am new to this so definitely need assistance. I want to control a bulb which is driven via 230v AC mains using ...
0
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0answers
43 views

How does this circuit work?

http://www.pcbheaven.com/circuitpages/Resistance_Touch_Button/ This is a very simple touch switch. I understand the basic working of this circuit but there are a couple of things I want to understand ...
0
votes
1answer
34 views

How can I switch multiple circuits using switches with limited pole counts?

I am trying to refine the design of an audio switch that I built a while ago. Since this is used to connect two inputs (two sound cards) to five possible outputs (speakers, tv, etc) with stereo audio ...
0
votes
1answer
40 views

Running a load off a solar panel connected to 2x 12V batteries.

I am having trouble figuring out what relay I should be using for my solar panel set up. I have a solar panel running to a solar charge controller. I then have the controller running into a relay. ...
1
vote
1answer
33 views

Make Bypass with Switches

I have the diagram below, but I don't understand how the switches are hooked up. Is that an special switch, or I can achieve that with an special connection? Thank you!
0
votes
0answers
15 views

SIM908 PCB Switch Current Contact Rating

I am working on a board with a SIM908 module. The board is powered from a 4.2V Li-po Battery. The user must be able to switch the board on and off with the aid of a slide switch. My problem is ...
0
votes
3answers
70 views

power selector switch [closed]

i'm still working on my usb meter. I still have a problem in my design, I would like to implement an external power supply and a battery. I was looking for a circuit that would switch automatically ...
0
votes
0answers
32 views

Two Sided Push Button Latch

so I have here a push button latch that is tried and tested and that works beautifully. But I need help making a variation of it that will switch between two circuits instead of just turning one ...
0
votes
0answers
35 views

Switch capacitor analysis without initial condition

The figure below is described as: C1 and C2 are the pumping capacitors but at given time and conditions of clocks (VCk and VCk'), C1 is being charged while C2 pumps its stored charge to CL (load ...
1
vote
0answers
50 views

MOSFET Behavior During Pulsed Operation

I am trying to use back-to-back MOSFETs/IGBTs to isolate my pulsed supply from my load. In theory, I will switch on the MOSFETs, and the pulsed supply will be attached directly to the load (but not on ...
0
votes
1answer
61 views

How do I realize this problem with a digital circuit?

I'm trying to design an indicating system for a vehicle if it crosses its speed limit. Of course I'd be using a potentiometer to realize the action of increasing speed. The input is given to the base ...
0
votes
1answer
28 views

Issues with Latching switch using push button

I'm trying to make a latching power switch based off this schematic (source: EDN) I emulated the circuit in Falstad and everything works like it should (link to simulation). However, it doesn't ...
0
votes
1answer
19 views

Ambient Light Sensor + Comparator

So I've been looking at options to create a way of controlling whether a flash will fire based on the amount of light in the surrounding environment. Early note: Everything has to be surface mount ...
0
votes
0answers
42 views

Relay is not isolating properly its sorrounding circuit blocks

It turns out I've been building up an elevator for a project (at College). In general terms, everything appeared to be correct, regardless that I hadn't simulated each part. I decided to begin with ...
4
votes
3answers
822 views

Is this a good way to debounce a switch?

There are plenty of debouncing circuits on the internet, but I couldn't really find one that fitted my needs / available parts, so I came up with my own, from what I had. There's nothing special about ...
0
votes
3answers
98 views

Momentary\Pushbutton Latch Switch

I'm trying to make a circuit that will latch on\off with a pushbutton. This is what I have, but the LED just stays on even though the current shows the latch is working. Thoughts? Thanks :)
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0answers
40 views

Driving multiple IGBTs with gate drive transformer

I am playing with a circuit I've been working on, which consists of a stack of 15 IGBTs connected in series. The end goal was to drive this "device" with a single toroid transformer, where the drive ...
2
votes
1answer
42 views

Automatic cut off after switch is pressed

I have a fun one for you. Here is my diagram: It's a 555 timer in a monostable one shot configuration. What I want to do is find a way to prevent the LED from staying on if the switch is held down. ...
2
votes
1answer
60 views

How to ON/OFF two fans with 3-state rocker switch?

I have a 3-state switch, It has 3 pins. It can have 3 state as you can see in the picture below. when it's off (i.e on O) the middle pin is not connected to ...
0
votes
1answer
41 views

Input protection circuit with P MOSFETs and SPDT for ON-OFF switch

I am making a circuit which may draw up to 3-4 Amps, so I am avoiding using a Schottky diode as fool-proofing it from incorrect polarity on the battery (12V, automotive style) input. I have used P ...
1
vote
1answer
91 views

High side P channel MOSFET power switch - gate question, and suggestions for my circuit?

My circuit is for switching a 12V battery to a load (LED lights, designed for automotive use), during my testing with prototypes, the lights consumed about 400mA, meaning they were ~5W LED products. ...
0
votes
1answer
69 views

Switch Vcc to Ground with a control bit

I have a device that is 1 ohm and it consumes 3Amp. I want to run my device in both ways and I have only one voltage supply. I want to switch ground to Vcc and vice versa with a control bit from mcu. ...
0
votes
1answer
52 views

Adding hysteresis to MOSFET used as a switch

I have a low-voltage detection circuit which I use to trigger one of two LEDs (green, and red) that is powered off of a +9V battery cell. As the battery discharges, its output voltage decreases, until ...
0
votes
2answers
35 views

Variable output PSU switch configuration

So I am designing a switchable voltage 9V/18V power supply and was wondering, what's the best way to switch between outputs, that's the current schematic I came up with: Original image size So my ...
0
votes
0answers
39 views

SC circuit equivalent

Can someone help me find the equivalent SC circuit for figure 3? Just like in figure 2 with its equivalent circuit in figure 1. I'm just confused with the drain of M6 connected to gate of M2 at node ...
0
votes
1answer
40 views

What is the current flowing through this switch?

I am looking at a circuit diagram like this: simulate this circuit – Schematic created using CircuitLab Switch 1 and switch 2 never are on at the same time (they alternate) I turn on S2 ...
1
vote
1answer
134 views

Why is my circuit not working?

I built a very simple circuit from a schematic I found online, but it is not working. It is a touch switch circuit in which I touch a metal object connected to the circuit, and the LED2 connected at ...
1
vote
2answers
82 views

Replace mechanical switch with transistor? MOSFET? Relay?

If I have a switch in some consumer electronics that I take apart, and want to replace a mechanical switch with a digitally controlled one, which component should I use? The only problem I see with ...
0
votes
0answers
29 views

Naming of “automatic” switches (relays, transistors, etc.)

Is there a name for the general concept of a switch whose output can toggle other switches (or itself), such as happens with relays, transistors (in digital electronics) and other specific switches?
0
votes
1answer
89 views

Switching Between Two Circuit Branches Using Basic Components

I'm working on a project that uses an LDR to switch between two mutually exclusive functions. So, when it's bright and sunny, do X and when it's nighttime do Y. The daytime function will involve a ...
1
vote
2answers
106 views

Is there any notification system that can turn on a LED pulse?

I have an idea, and I searched if it exists and didn't find anything. I'm a live sound Engineer, and many times my musicians want to call for my attention, and I'm distracted with other sound things. ...
0
votes
2answers
91 views

Controlling AC mains using Arduino and removing control easily

I am planning to for an Arduino to read status of a switch, and accordingly switch on and off AC appliance, for a demo purpose. I want to add a feature to it of easy recovery to manual switch control. ...
0
votes
0answers
42 views

Slewing sensor across entire 5V input signal using potentiometers

I am trying to slew a vacuum sensor in my car. My trouble is, use of a single potentiometer only allows for slewing of the lower range of the input signal, that is, from 0 - 100%, the signal can only ...
1
vote
2answers
77 views

Designing an ABBA circuit (3 input, 2 output) inputs: (GND, +V, Logic)

I'm working on a relatively simple Arduino project and want to reach an elegant solution for a circuit. I'm not sure if there is an existing IC for what I want to do, but here is a diagram for what ...
0
votes
1answer
34 views

Fastest resistive touch panel response time?

1/ What is the fastest response time of touch panel? 2/ It seems resistive panel can get under 10ms, but I want a faster panel, is there any one with under 1ms or microsecond response time? 3/ Why ...
3
votes
3answers
452 views

Automatically switching from 9V battery to DC wall adapter on insertion

I have a simple circuit that runs off of a 9V battery. I'm re-designing it so that it can also run off of an external 12V DC source (ie: a wall adapter). I want to design the circuit so that if both ...
0
votes
1answer
69 views

Adjustable charge current from programming resistor for Li-Ion charger - how to change on demand?

I am designing a device which has an integrated Li-Ion battery (single cell, for simple low power portable digital device) and normally charges by way of a buck converter which goes from 12-16V ...
2
votes
2answers
53 views

Protecting a comparator in a tension measurement device

I am building a device to measure the tension of a conducting wire using an Arduino. The basic circuit concept consists of two stages: The wire is placed in a strong magnetic field. Then the ...
0
votes
1answer
76 views

How does this PMOS circuit work?

I've been trying to figure out how this PMOS circuit is functioning. B_VCC is 5V coming from a USB port on the board, while VCC5V is used elsewhere in a regulator to create 3.3V but otherwise does ...
-1
votes
1answer
59 views

Switch shift by voltage

At \$t=0\$ switch A opens, switch B closes when there is a voltage, U2. U is a DC voltage source \$> 0 \$ also is the circuit until \$t = 0 \$ in stationary state. My question is whether switch B ...
3
votes
2answers
113 views

Switch on computer with microcontroller

I'm making a simple microcontroller based circuit to turn on a computer when certain events are triggered. I am interfacing it using the PCs soft power switch pins on the front panel header: There ...
0
votes
1answer
64 views

Quick-connect terminals - how to mount/connect them? Or Alternative PCB switches

I am currently designing a product for use in the automotive industry, and it will be used externally to the vehicle. I am at the awkward stage of trying to combine PCB design with product ...
0
votes
1answer
37 views

Help me about system switch control ladder light? [duplicate]

We all know about the system of two switches controlling one lamp(at the ladder) like the picture. Could you help me design a system of four switch to control one lamp ? thanks