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

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23 views

Led matrix 12x32

I need some help in building my summer project. I'm planning to build a 12x32 led matrix(384 individual LED's, Blue) AND PLACING IT ON A TABLE.. w/ an arduino mega 2560 with a power switch so that I ...
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1answer
30 views

Using BILATERAL SWITCH properly?

Summery: I am trying to figure out if I can use a bilateral switch as if it was a tiny relay capable of communicating UART signal, or are there things I am missing. Now, the long explanation. So, I ...
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1answer
40 views

Placing a diode between low and high beam on a motorcycle

I am trying to place a diode between the high beam and low beam on my motorcycle. My headlight is a skull, it has the two eyes as high beam, and the mouth as low beam. the way it is wired, when you ...
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2answers
48 views

Implementing a automated DB25 switch

I currently have an application that uses a DB25 switch to switch signals between two devices (it's not actually a parallel port - there are analog and digital signals as well as DC power on the ...
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1answer
26 views

Terminology for referring to a normally open switch vs the normally closed setting it is used in

Is there some standard way to distinguish between the normal state of a particular component and the environment in which it is used? For example, a reed switch would be considered normally open if ...
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1answer
36 views

Relay circuit with off switch

I've been searching for a similar circuit and only found latching relays with two momentary switches for on and off. I don't know if this circuit has a specific name or not, and since I am a complete ...
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0answers
16 views

A pulse triggered bistable switch circuit

I'm designing an IC but need a simple circuit to turn ON/OFF by a pulse and stay in its state until another pulse comes to switch it to the other state, I found several things like those on the ...
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0answers
63 views

Can some help me understand this ground switching circuit?

I am trying to understand a switch circuit related to a project that I am working on. Pin 1 - 12v signal for switch backlights Pin 2 - 12v signal for switch on/off indicators Pin 3/4 - Unused Pin ...
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1answer
39 views

Switch in Circuits

I am really confused about what happens to the circuit when the switch is open or closed. What does t=0 , t=0+ , t=0- , t<0 and t >0+ mean ? what does it mean if the switch has been in ...
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1answer
59 views

A switch that is only ON if the reference voltage is matched -+ 0.1 volts

Im a beginnerish will electronic and im looking for a switch that is only ON if the reference voltage is matched -+ 0.25 volts. So if i have a reference of 2.7v to match and i feed the switch a 2.75v ...
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1answer
33 views

DMM 1000 Volt switch [on hold]

I am trying to design a digital multi meter and the switch on the incoming voltage line needs to be 1000 V. Since all commercial DMM use custom made switches to handle the high voltages coming in. ...
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3answers
67 views

Double-throw switch with no common connection?

I need a DT, ON-OFF-ON switch to control two independent circuits with no common connection. I need something that behaves like either A and B, or C and D in the diagram below. Does such a thing ...
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27 views

Clutch switch for tractor [on hold]

I am working on a tractor with a hydraulic clutch controlled by a 12 volt solenoid. I need a switch that will mount to a 5/16 shaft (that extends from the clutch pedal). It should have 12 volts on the ...
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2answers
64 views

Logic level MOSFET switch

I am trying to use a FET to switch on a boost converter. simulate this circuit – Schematic created using CircuitLab From reading I have found that people like to use IRFML8244TRPBF for ...
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0answers
34 views

how to make high frequency toggling switch for household voltage? [closed]

I am a student who is under the project to make flash lamp produce UV pulse with duration of 1μs to 0.1s. I have to obtain it using household supplied current 220V. Is there any component which can ...
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1answer
29 views

Making a light switch timer?

I'd like to have a light switch that turns on for at most 1 hour. My idea is to put a USB charger (110AC -> 5DC) + arduino + relay inside the wall. When the switch is turned on, it will turn the ...
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2answers
34 views

12 volt switched by 5 volt

I have an issue with 12 volt DC LEDs installed on a 5 volt DC circuit. Switching must be performed as close to instantaneous as possible. So I searched around but nothing would do what I need. I ...
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1answer
25 views

Independently toggling two series switches to multiply two pwm signals

Preface It is known that one can synthesize a signal into a train of boxcar pulses (pwm modulation), each with the same amplitude, if proper low pass filtration is applied to this pulse train before ...
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2answers
168 views

Can I use pushbuttons with pull-updown driven by a gate?

I have a digital circuit, which generates a signal passed to another part (let's say a flip-flop) and I want to be able to force this signal 0 using a pushbutton. Do I need to use any additional logic ...
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2answers
23 views

Step Response RC Circuit: Current at Capacitor

I have a problem understanding why is that ic=0 at t<0 if the switch is closed for a long and only opened for t=0? My friend told me that at t<0, the ic will always be 0A regardless whether ...
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1answer
95 views

Help explain how this ac switch circuit works

Below is an ac switch circuit. COIL1_EN is used to enable or disable the switch. Does any one know how this ac switch work? I think it may be a standard design, can anyone give the related ...
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2answers
90 views

Is there a kind of switch that after being pressed, even if not released, will open the circuit again?

I want my sliding door to turn off the tv. So I opened the remote control of the TV, soldered a KW12-3 switch to the pads of the original ON/OFF momentary button, and everything is working good, I ...
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1answer
107 views

Best way to control power with MCU gpio pin

This is my circuit. An MCU gpio pin should control the power of another IC. Because the component requires more current than the gpio pin can drive, an N-Channel MOSFET is used. This is IC has no ...
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5answers
174 views

DPST switch control 5vDC and 220vAC

I would like to make usb-charging sockets from two sides of the bed, and I don't like the idea of power supply working 24/7 so I decided the following scheme to have power ON while me or my wife are ...
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2answers
36 views

Built-in air conditioner timer switch wiring

I'm not sure if this is specific to this model only, but I was unable to find any standard wiring schematics for this type of switch. This is for a Haier HPAC9M air conditioner unit. I want to ...
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2answers
70 views

MOSFET-N as a switch for several ICs

I want to use MOSFET-N (MTM232270LBF) as a power switch for several ICs in my project. It should poweron the devices when logic level is high (3.3V) and poweroff when 0V. I want to ask you if ...
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2answers
41 views

Help with DC switch current

I have a DC switch rated at 2A at 36VDC, if I were running the switch at 4VDC what would be the maximum current I could safely run through it? I'm assuming I can't simply use the wattage to calculate ...
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1answer
42 views

Switching circuit or relay [closed]

I'm new here and don't know much more about electronics.I need a switch/relay that help me off DC line when AC (grid) line is available and automatically turn on when AC (grid) line is not available. ...
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1answer
34 views

Mechanical Contactor for High Voltage DC - Substitute with Semiconductor

To switch 1kV DC at 5A, I usually use a mechanical contactor (<- Wikipedia) that switches both highside and lowside of a resistive load. Any suggestions on a semiconductor (or non-mechanical part) ...
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0answers
17 views

How to use switch in line-in audio jack connector to (de)activate electret microphone?

I have a megaphone with an electret microphone. The voltage at the microphone is about 3.1V and the microphone has a resistance of about 1 kOhm: I replaced this microphone with a little circuit to ...
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1answer
48 views

450mA in CK1050 rotary switch

So i bought CK1050 rotary switch i now i realized that it's rated only for 150mA 250V AC/DC on the data sheet. I need to use it with 12V DC at 450mA so will it be safe? If you think the watts it ...
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3answers
60 views

Read the state of a 12v illuminated switch from an Arduino Uno

I've got an Arduino Uno, and I want it to be able to read the state of a 12v "Illuminated Switch" in a way that allows the switch to properly illuminate. I have an external 12v, 1.5A power supply ...
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1answer
26 views

Add line in to electret microphone and mute the microphone when plug is connected

I have a megaphone with an electret microphone. I want to modify the megaphone so that I can optionally conntect a notebook's headphone out to the megaphone. So I want to add a line in connector to ...
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2answers
48 views

lowest loss for switch

Are there any other options for an extremely low loss switching circuit with extremely low switching frequency (about 4 times per day) and voltages from 0-3V with currents <2mA. Current ideas ...
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2answers
52 views

How to calculate voltage and current of a circuit with input / output MCU pins

I would like to know the method to calculate both voltage and current in a circuit that use MCU input / output pins In this example, how can we find the V / A of all resistances and Capacitors.. ...
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1answer
30 views

Automatic and manual clock managing. Errors with ring counter but not with 4-bit counter

I'm building an 8 bit computer and I've just developed the clock. I used a NE555 (datasheet) with some other integrated (74 series) to manage it. The operator could stop signal from 555 (with a ...
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1answer
55 views

how to add switches to the end of the rotation that will cut off a stepper motor so I don’t damage anything at the extremes of the motion? [closed]

I need to work on how to add switches to the end of the rotation that will cut off a stepper motor so I don’t damage anything at the extremes of the motion. I'm using a Dual - H Bridge to control the ...
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2answers
51 views

How might this RF double pole switch be constructed and perform?

So I'm aware that there are some high speed RF SPDT switches e.g. Single-Pole Double-Throw (SPDT) switch offering 20nS switching time. I'm interested in a switch like the following picture. This is ...
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0answers
25 views

Latching and Momentary Combo Switch

I am looking to recreate a switch circuit I have seen on an intercom system. The switch allowed for two functions, while using one momentary switch. When the switch was pressed and emetily released, ...
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0answers
19 views

Circuit for auto repeat switch off/on USB Data-

I recently aquired an APC UPS and connected it to my (Mac) server through USB. However, the load percentage is only updated (via pmset -g ps) when unplugging/plugging the USB cable. I found out it's ...
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2answers
86 views

Adafruit Powerboost latching switch

I am trying to design a circuit that will completely turn off the Adafruit Powerboost 500 (by connecting the ground and EN pins) automatically. As part of this, I have come up with the attached ...
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1answer
48 views

Triggering a LED and interrupting it quickly (with a PIR sensor). What do I need for this?

I'm an artist working on a interactive installation. I'm a beginner in electronics and I'm feeling a little bit lost here, can you help me? I have a 5v circuit with a PIR sensor activating a LED and ...
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1answer
53 views

Is a “self-bootstrapping” zero-crossing AC power switch possible?

As a follow-up to this prior question I'm looking for a zero-crossing mains (120V) power switching solution to mitigate the bounce-related EMI I'm getting using the "stock" traditional ON/OFF toggle ...
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2answers
58 views

How suppress bounce-related turn-on spikes in DC bench power supply?

I'm taking a refining pass on my DC Bench Power Supply design. It generally works quite well on veroboard, so I thought I'd move on to SMD PCBs and refine the design while working out a few of the ...
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2answers
64 views

How to determine a capacitor value across a switch carrying DC

The tiny rocker switches I'm using in a current project are supposedly good for 3A DC, which is at least 2X what I'd expect to draw worst case. It is supplied from a hefty Li-ION battery source ...
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2answers
92 views

Is it possible to read a 10 by 10 switch matrix with 8 by 8 I/O pins?

I was asked this question on an interview: given 8 output pins and 8 input pins on a microcontroller, is it possible to read a 10 by 10 switch matrix without using multiplexor and demultiplexor chips? ...
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1answer
81 views

IC to patch pins arbitrarily?

Is there an IC that will support patching pins together arbitrarily for AC or DC signals going in both directions across any patched pair of pins? I'm pretty sure it could be done with an FPGA though ...
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1answer
45 views

Remove pin to close switch

I'm looking for a small fairly rugged normally open switch that closes when a "pin" is removed. It needs to take about 12V It needs to be passive and not require power. Is there such a component? ...
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2answers
25 views

Resistance network

I'm looking to create a circuit which will be used to test external PCBs. One of the external circuits features four switches with three resistors in what I believe is known as a resistance ladder (or ...
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2answers
49 views

On - off - on rocker wiring

I am wiring an "on-off-on" style toggle switch from the AC mains to turn a power supply on and off. I don't need the second "accessory" line from the switch, should I just leave the third pole ...