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Questions tagged [switches]

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

3
votes
2answers
108 views

dpdt switch to spst switch

I am trying to build a raspberry pi gameboy emulator with a custom board inside of a gameboy adv sp shell. I decided to use an open-source board made by some guy on the internet and I will be ...
1
vote
1answer
29 views

Automatic transfer switch or some such solution

I have only rudimentary knowledge of electronics. I live in South Africa, where we are now experiencing rolling blackouts. (Euphemistically called "Load Shedding" here.) During the day it's just a ...
0
votes
1answer
42 views

Switch for low voltage, high current Shape Memory wire

I need a switch to allow current to pass through a wire to Joule heat it. This is a nickel-titanium wire (Shape Memory Alloy, SMA) which has been programmed to bend into a particular shape when heated....
0
votes
0answers
25 views

Is there a power socket selector/switcher (where only one of multiple devices attached is selected to get the power)

I'm looking for a device whereby I can choose which socket the power is directed to (in a similar way to a KVM switch for computers sharing a single (K)eyboard (V)ideo Display and (M)ouse, but in my ...
0
votes
0answers
20 views

Single key not working on DIY mechanical keyboard (xd75re PCB and Switch both work)

I have assembled my first mechanical keyboard using the xd75re PCB. I used a plate mount, and all of the switches were installed without issue (this PCB has hotswap). When I used keyboardtester.com to ...
0
votes
2answers
66 views

What type of switch is this push switch [photos]?

I suspect this switch isn’t functioning correctly and would like to replace it but can’t find one similar. What sort of switch is it? The front is a push with two states (in/out) and has a bulb to ...
0
votes
0answers
6 views

Need help wiring low beam and high beam headlights [migrated]

New aftermarket headlights on my daughter's truck have separate lights for low and high beams. I would like to wire them together so the low beam will still work independently, but they both will come ...
0
votes
1answer
50 views

Smart Wi-Fi Switch with No Ground

I want to install some smart switches in an older home without ground wires. I'd also prefer not having to purchase a "Smart Hub" as they seem to be going away and not necessary. Note, I use Google, ...
4
votes
1answer
99 views

How do I assemble the mechanical parts of panel mount switch? (lock ring, lock washer, nut, etc)

I'm sure this is a very simple question, but I'm not familiar with the different mechanical parts of a simple switch. For example, I've purchased this switch and it includes: Switch "Lockwasher" ("...
0
votes
4answers
59 views

4.5 V on gate of Mosfet while switch open

I have a strange behavior with the circuit below. (the bidirectional logica level should be read as: VL = Voltage Low GNDL = GND Low VH = Voltage High GNDH = GND High L1 = Low channel 1 (I did only ...
-1
votes
3answers
58 views

Help with making sure a correct use of a BJT

I'm designing a PCB that receives 3 power inputs 3.3v, 5v and 12v. I need simple way to switch all of them of in one go. Here is a schematic of my PCB My 12V line is for running a ws2815 led strip ...
0
votes
1answer
35 views

Latching switch to single pulse circuit? (monostable multivibrator with 555?)

I am looking at using a latching switch (SPDT) to momentarily connect two pins. This is for a power button for a raspberry pi, so to power the machine from a hold state you have to momentarily short ...
1
vote
0answers
65 views

switch without diode

I have a project where I need to put a switch in between the resource from tester and the DUT. My DUT is a 48 pin device (semiconductor IC), each of the pins has its own ESD diode. The switch, for ...
0
votes
3answers
104 views

Why is my crystal oscillator not working with KSZ8999 switch?

I am using KSZ8999 ethernet switch from Micrel and I have problem with 25 MHz external oscillator. There is constant 2,1 VDC on output pin which is VDD for the switch, so crystal is not oscillating. ...
0
votes
3answers
55 views

Question regarding ground when using teensy to control a mosfet switch

Despite the fact that I'm pretty new to electronics I'm working on a quite ambitious project which is basically a USB-Midi Controller attached to different devices that send different signals. The ...
0
votes
4answers
110 views

Can an optocoupler be used as a switch [closed]

I am trying to replace a analog switch (the switch is a momentary button in a low current DC situation) with optocoupler. Is it possible to use an optocoupler as a switch (i.e. just on/off)? ...
0
votes
3answers
51 views

AC rocker switch on a DC circuit

I ordered a set of DC rocker switches that were advertised as "4A 12V DC SPST" I was planning on using one to power an Arduino based project using 5V DC which will draw no more than 1 to 2 amps. ...
0
votes
1answer
76 views

how to switch off multiple power source (+5/+12/3.3) in the same pcb

I'm designing a PCB that receives 3 power inputs 3.3v, 5v and 12v. I need simple way to switch all of them of in one go. Here is a schematic of my PCB I looked into using a relay but all the types I ...
0
votes
0answers
36 views

SMD Detector Microswitch Replacement

One of my son's toys stopped working and I decided to jump in to see what was causing the problem. I found that a number of the smaller detector microswitches had their tabs broken off. Therefore ...
1
vote
1answer
57 views

Override One Lamp in a Four-Lamp Circuit Using Transistor?

simulate this circuit – Schematic created using CircuitLab I have a circuit of 4 light bulbs, with single switch on the positive terminal that will turn all the 4 bulbs at once. EDIT: Light ...
1
vote
3answers
101 views

Can I use a 12v 20A DC switch for a 24v 10A DC load? [duplicate]

simulate this circuit – Schematic created using CircuitLab I have a toggle switch that is rated for 12v 20A (240 Watts) and I have a load from a battery that I want to turn on or off with this ...
0
votes
0answers
28 views

Slope of the Inductor current

this forum is very helpful in the term of power-electronics. I got a question about LT-spice simulation. I want to compare the slope of the inductor current in two circuits.The only difference between ...
0
votes
3answers
91 views

How to remove leakage current from nRES transistor switch?

I have this AVR reset pin design, which provide a 12V into the nRESET pin of an ATtiny μC. It's function can be describes as follows. (a) An input signal given by a "low" (0) on ...
0
votes
1answer
36 views

Using P-MOSFET with Gate and Source have same voltage to protect reverse current

I have a question when I am working on MP2639A 2-cell LIPO charger (+8V4) from USB +5V. The recommend schematic uses P-MOSFET to protect reverse current from Load back to a USB plug. taken from ...
0
votes
1answer
48 views

Lt-spice switch model

I have a very simple circuit and want to see the current in the inductor. But I do not know why switch is behaving like that... Actually, I supposed to get KA range current. but it gives me very ...
2
votes
1answer
75 views

Charge Injection Confusion

I'm having some trouble understanding the effect that charge injection has on capacitors - more specifically, when there is unequal charge on a capacitor. Consider the following circuit: My ...
1
vote
0answers
44 views

Snubber for Relay Contact Switching Resistive Load

I am working on a redesign of some circuit boards and am looking for a way to save space and potentially switch to surface mount parts. Some of the largest through hole parts in use are for an RC ...
0
votes
0answers
58 views

Any Self-turning switch?

I am looking for a switch, which can turn between 3-4 stages and also do it by itself. Do you guys know what I should search for? Thanks :)
3
votes
2answers
83 views

Electronically triggering contact pad buttons on a wired remote with a Raspberry Pi

I would like to control my AC with a Raspberry Pi. My system is similar to this one, although it is an older model from 2004. Currently the system has a wired controller. There is no bluetooth, wifi, ...
2
votes
1answer
45 views

Design ethernet switch for multiple devices on pcb?

I'm working on a pcb design with a Raspberry Pi CM module and a microcontroller with ethernet capacity. The goal is to connect the devices to the internet. I'm currently using a normal ethernet ...
0
votes
0answers
14 views

Non-overridable timed autocut switch

I need a switch which upon a single press turns off for a fixed, constant duration (here 8 hours) and even if the user manually represses the switch during this duration or keeps it overpressed, it ...
0
votes
2answers
84 views

How do I connect a four way key in a potentiometer?

I asked this question in Physics stack exchange and had an answer, but I couldn't understand it well. A comment said this stack exchange was a better fit for the question. Question: How do I connect ...
-1
votes
1answer
81 views

total newbee question : use transistor as a switch

Ok, I don't know anything about transistors, and my knowledge about electronics is basically limited to U = R . I and ...
8
votes
5answers
1k views

Switch for DC application

I have two solar panels in series totaling a maximum of 80 VDC and 500 Watts. I believe that would be a maximum of 6.25 Amps. Could a 20A 120/277V AC switch handle that since 6.25 Amps is a ...
0
votes
1answer
54 views

Addition of limit switch for power supply stops circuit from working. Circuit works fine without the switch?

I am having an issue with a limit switch to turn on and off a circuit. I am using a L7805 5V regulator with a regular 9V battery as the power supply for my circuit. When I plug in the 9V battery ...
3
votes
4answers
222 views

What types of mechanical switches are appropriate for a 200 V DC 20 mA circuit

I have looked at many switches, most recently I considered snap action switches (micro switches). What I prefer to use is a PCB mounted switch, but I cannot find any that can tolerate the V DC ratings ...
0
votes
2answers
70 views

Non-shorting Rotary Switch “dead” Time

Is there a nominal dead time for rotary switches? Obviously all switches are different, so this value will not be precise. For making a reasonable situation, let us assume that a detent style switch ...
0
votes
1answer
49 views

Identify part orientation

I have a part that looks like this under my microscope: and it is a TPS22810 load switch (datasheet). But, how do I know which side is which?
0
votes
4answers
97 views

connecting panel mount switches to PCB

I have a set of panel mount switches I'd like to connect - via cables - to a pcb. The pcb won't have any components on it, it will just be a wiring loom. the concept is that having the complexity on ...
0
votes
2answers
54 views

Rotary switch for bench supply ammeter

I plan to build a bench supply using a used ATX desktop computer PSU, with 3.3v, 5v and 12v binding posts as well as a cheap voltmeter-ammeter combo module (DSN-VC288). I know it's going to be ...
0
votes
1answer
88 views

Triac BT 136 getting shorted when load is given to T1

We have a optocoupler switching circuit which triggers the TRIAC with ZCD. Everything is working fine with all inputs. Connection is T2 as a input T1 as output Gate as Trigger from Optocoupler As ...
0
votes
3answers
55 views

Checking how many inputs (reed switches) are active using minimal GPIO pins [duplicate]

I've been a programmer, for a while, but I am new to the hardware aspect of things so I apologize for my lack of knowledge. Just for a fun project to try to get better with hardware, I've decided to ...
0
votes
2answers
68 views

Siren sounds weird when driven through NPN transistor

I'm trying to drive a 6-28VDC siren from an Arduino Nano output pin. The latter provides 5V (max 50mA). I've connected Arduino output to base of NPN through a 100k resistor, with emitter to ground ...
2
votes
1answer
55 views

2N7000 NMOS only switches properly when gate and source is connected with 1MΩ

I am building a circuit on a breadboard to see if I can get a 2N7000 NMOS to switch using a 3.3V V_gs signal. As far as I know, I've set up the circuit properly: simulate this circuit – ...
0
votes
1answer
30 views

Simple NMOS simulation error. High voltage drop across the nmos when trying to make a MOSFET switch

I have this simple NMOS configuration in ltSpice. I would imagine that when V2 (Vg) goes high, Vds would go close to zero. But this simulation suggests that there is a very high voltage drop across ...
0
votes
0answers
30 views

Can a MTS 101 2 pin ON-OFF switch rated for VAC be used in a DC circuit?

I'm currently looking at buying a bunch of MTS 101 rocker switches which are rated for: AC 125V 6A, AC 250V 3A For DC the rating is not available http://www.massuse-relay.com/details/MTSSeries.pdf ...
1
vote
2answers
88 views

How to fully shut off an LED indicator when used with a Smart Switch?

Update See added comments at end of question. I am working on a project to implement a remotely lit indicator when triggered through a wireless connection. To make this work I am trying to use ...
0
votes
1answer
112 views

MOSFET is always on

I have this circuit my boss wants me to check out: He says even when the "HEATELEMENT" is un-soldered, pins 1 and 2 present a voltage of "Batt" across them and he wonders why. Any suggestions? One ...
0
votes
1answer
62 views

How do I combine 3 batteries in series and parallel with different outputs?

I'm looking to combine the 2 circuits shown in the picture below using a switch.(ON-OFF-ON) I would like to keep the 12V output seperate from the 24V output. This is to maximize efficiency when using ...
1
vote
3answers
131 views

USB hub inside modular keyboard for comunication

I'm working on a personal project which consists on a keyboard that also serves as a hub in order to connect more keyboards. For example, I could have the main keyboard with the letters and symbols ...