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

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1answer
20 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!
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12 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 ...
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3answers
65 views

power selector switch [on hold]

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 ...
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0answers
29 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 ...
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0answers
33 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 ...
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0answers
42 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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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3answers
815 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 ...
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3answers
96 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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36 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 ...
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1answer
40 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
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1answer
59 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
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1answer
36 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 ...
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1answer
80 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. ...
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1answer
66 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
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1answer
50 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 ...
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2answers
34 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 ...
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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
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1answer
39 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 ...
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1answer
133 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 ...
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2answers
77 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 ...
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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?
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1answer
84 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 ...
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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. ...
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2answers
76 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. ...
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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 ...
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2answers
72 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 ...
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1answer
33 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
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3answers
444 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
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1answer
67 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
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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
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1answer
75 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 ...
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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
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2answers
109 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
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1answer
63 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
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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
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1answer
102 views

How Start/Stop Push Button Switches work?

how exactly this switch works? does it close the contacts when green is pushed and keeps it closed until red is pushed?
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3answers
56 views

Magnetic reed switch current ratings

I wish to use some 12 V, 5 W xenon light bulbs under separate shelves of a cabinet. I'd like them to power-on using a magnetic reed switch attached to the cabinet door. The magnetic reed switch I ...
15
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3answers
603 views

What does a “sad face with a bow tie” represent?

Some trains in the Madrid metro network have small metal boxes with this sign on them: There are no other signs on the box and some signs only have the "bow tie". I'm guessing it's two Zener ...
2
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3answers
148 views

How do Wi-Fi controlled light switches feed themselves?

There are smart light switches in the market that are Wi-Fi controlled like Plumlife (formerly ube) and Belkin WeMo. I wonder how they control the electricity that they operate on. When I unplug my ...
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36 views

Could you explain me how the Proximity Switches of the elevator work?

Could you explain me how the Proximity Switches of the elevator work?
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1answer
45 views

How do these switches work?

I have these switches in my home which you push once, they don't flip over just go back to the initial position. We have like 4 of those and I really want to know how they work. Can someone explain ...
0
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1answer
67 views

Adding a switch to an existing light

I've read about 3-way and 4-way switches but I don't understand something. I am aiming to create a bluetooth controlled home network. One of the modules would include a light switch. How would I go ...
0
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2answers
52 views

What is the function of switches in optical panel encoders?

I want to use optical encoder in my design. In the datasheet of the optical encoder, pin2 and pin3 are used as switches. Could you please explain how these switches work and how to use them? Thanks.
2
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3answers
240 views

Clap Clap Switch Modifications

I wanted to make a modification to the clap clap switch with a schematic diagram below but instead of a LED lighting I want to make it turn on a small fan..
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2answers
105 views

Switching an LM317BTG on/off using a microcontroller

We're using an LM317BTG to power a 4V modem (the LM is connected to a 12V battery). The modem can produce peak currents of up to 2A during transmission bursts. Under normal operations, the modem ...
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1answer
118 views

Calculate current using compensation

simulate this circuit – Schematic created using CircuitLab Okay, first I'd like to apologize if this question seems stupid, but I'm preparing for an exam, and don't know how to solve this ...