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

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31 views

Can a higer-voltage switch be used in my circuit?

I'm playing around with my first circuit assembly on a project I'm working on. It very basic, just three AAA batteries (4.5v) and several LEDs. Everything is working perfectly in a simple, direct ...
0
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1answer
18 views

Interconnected ground planes on signal/component-layer

From what I understand, RF- and microwave-circuits needs separate ground planes to avoid coupling between signal and DC/digital currents. I'm currently involved in an RF-project where we're going to ...
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1answer
30 views

How do you construct a dual-input switch using transistors?

I have part of a circuit that I wish to disable power to depending on two input signals (digital, active low). How do I realise this, preferably using transistors? Application The two signals comes ...
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3answers
55 views

Power switch placement

When building a circuit, are there any conventions as to where the on/off switch should pe placed? As in between the negative pin of the battery and ground, or between the positive pin of the battery ...
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0answers
25 views

PIN Diode T-R Switch for use with RF Power Amplifier

I would like to use PIN Diodes to actuate the T-R switching of my RF Power Amplifier, however, I am having trouble understanding the proper way to accomplish this. I would rather use a solid state ...
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0answers
20 views

Switching power supply of a modem with a microcontroller

I want to measure the power consumption of a modem in a certain scenario. Modem can drive current maximum 2A. The scenario is that, every 5 hours the microcntroller will turn on the modem power supply ...
-1
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0answers
30 views

pci-e physical switchbox? [on hold]

I have a farm of workstations, several with pci-e expansion chassis. One workstation has no expansion chassis, and when I want/need to run several cards (GPU, Tesla, Pci SSD, etc.) with assurance each ...
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4answers
103 views

Optimize PNP/Diode Schematic

I am trying to design a circuit which has four switches, numbered 1-4 as in the diagram. The circuit should function such that closing switch n turns on light ...
1
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1answer
48 views

Mosfet won't turn fully on

I have a IPB011N04LG N channel MOSFET configured as a switch in the following circuit: It works, but doesn't turn fully on. If \$V_{\text{BAT}}\$ is \$23\$V I get \$11\$V on the load side If ...
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1answer
33 views

ic relay.. is there any delay for the responz of <İC insıde the circuit

Regarding SPDT ic relay TS5A3157. Do we have a delay responz inside the İc/ do we have a click sound. Because im startıng for a new project that can switch wireless, bluetooth or ir. What i need on my ...
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1answer
53 views

Semiconductor SPDT-switch - use outputs as inputs?

Can the outputs of a semiconductor SPDT-switch be used as inputs if I reverse the switch? I can't see why it shouldn't work, but I though I'd ask anyway.
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2answers
41 views

Lighted SPST switch waiting problems

I am trying to put together a model rocket launcher for my son and am having issues with wiring. He wanted it to look "cool" so I have two SPST switches that light when powered, and a single SPST push ...
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0answers
27 views

Controlling a three-wire valve via µC and transistor-based SPDT

I am building a garden watering automation thing. An MSP430 controls a 12V three-wire motorized ball valve (CWX15Q CR-02). One wire is GND, one is OPEN and one is CLOSE. Now I need a circuit to ...
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1answer
238 views

Why use a N channel MOSFET as high side H bridge switches?

I've seen N channel MOSFETs as high side switches of H bridges quite often, which requires a charge pump to drive. Wouldn't a P channel MOSFET be easier, simply isolating the microcontroller command ...
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0answers
30 views

Confirm my suspicions about astable 555 “always on”, dumb mistake?

got a astable 555 timer schematic here, worked fine with a through hole NE555P when I didn't add the switch to pin 4. Now, in my SMD NE555PSR, the pulse is simply always 'high' or always 'low'. Am ...
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2answers
40 views

Latching switch turning back to off on power loss

I can't twist my head around the proper use of my latching switch problem. In detail, the latching (or maintained) switch should switch a 48V DC source power supply for a cisco router. The 48VDC power ...
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0answers
24 views

Issue in SPST Switch IC adg1401

I am using ADG1401 IC for my application.. I have given +/-5V Supply for the IC... I used 100k pull-up resistor in the IN pin... And I have given a 3V 10Khz Sine Wave as the input signal...I'm ...
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0answers
21 views

how to wire a timer without negative using ground [migrated]

I have a switch i would like to replace with a timer like this http://www.amazon.com/forum/-/Tx3DCN3HLSARWFS/ref=ask_dp_dpmw_al_hza?asin=B004SOZHXY i only have a positive wire in my switch box, ...
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3answers
35 views

Why does switch change parallel current after junction?

This is an image demonstrating the use of a pull up resistor. I've just started studying electronics and have been learning about ohm's law. Ohm's law says that current within a circuit is equal to ...
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2answers
34 views

Will a I2C switch boost the overall bitrate?

I am currently working with a wired I2C bus system consisting of 6 individual bus lines with 4 slaves on each. They are currently all connected to one I2C bus and for each slave i add the bus becomes ...
0
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0answers
65 views

Voltage divider biasing circuit switch, which resistors should I use?

Goal: To turn on (open) a solenoid valve valve for irrigation when the soil moisture sensor reports a value below X% and shut it off (close) above X%. X should be able to be changed between say 20-80% ...
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0answers
66 views

Transistor switch help

For starters this is the circuit I have made. I don't have the same relay board, but it is active low. My problem is it seems my PN2222a transistor seems to be leaking current when the base signal ...
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0answers
74 views

Simplest way to switch between power sources?

As I mentioned in another question, I have a battery charging setup where currently AC power feeds a AC-to-DC power supply which outputs 48VDC to a battery charger. The limis for the charger are: ...
0
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1answer
51 views

LM311 Current Sensing Switch

I need to create a current sensing switch and am looking for ideas. I have very little experience with op amps / comparitors (as you'll see) but this seems to be the way to go. I am monitoring 24VDC ...
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2answers
191 views

Make-Before-Break Relay with Very High Continuous DC Current

I need to use a relay in order to do field sweeps with my electromagnet, which is hooked up to a couple very beefy monopolor power supply. (My magnet's impedance is ~2 Ohm, and I am putting ~40 Amps ...
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4answers
1k views

What is a push-up/pull-up resistor? [duplicate]

A.S. The question A question on pull up resistors answers only a part of my question as already mentioned in "EDIT" made shortly after this question was asked & answers here (below) are much ...
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1answer
42 views

Control connectivity of resistors in voltage divider arrangement

I am building a device to measure the resistance of a resistor using a voltage divider. I added multiple resistors so that the range of the divider could be changed by switching to another ...
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2answers
38 views

25V for PMOS switch VGS?

In a load supply using P-MOS, the input to source is 25V. We found unfortunately that the MOSFET we chose and soldered has only 20V maximum gate-source voltage. Although there are voltage dividers ...
2
votes
2answers
72 views

2 LED Parallel circuit help?

I need to make a circuit with 2 leds, 1 green 1 red. If the current flows, green led will light up, if there is a break in the circuit (open circuit) it will light up another led as red. I don't ...
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2answers
43 views

Alternating between two LEDS using BJTs and SPST Switch

I made a circuit based on this post, Alternating between two LEDS using BJTs. It seems to work in the simulation just fine but when I'm connecting it with real components, I get funny behavior. ...
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2answers
43 views

Momentary to Toggle Switch for Tiny Application

I need to put a circuit into a pen to turn on and off an LED using 3 AG3 or LR41 batteries connected in series. The LED will be on the tip of the pen and the switch will be on the side surface of the ...
1
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1answer
62 views

How can a remote-controlled (wall) light switch operate without a power source?

A few days ago, i bought this remote-conrolled light switch. When installing it, i wondered why i had only two lines to connect (the one going to AC power and the one to the lamp); i thought i needed ...
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2answers
54 views

What do you call a rotary switch that does not have a max turn degree?

Exactly like on the Logitech G35 or Logitech F540; not a rotary switch because those have notches and a physical limit. Instead of turning clockwise, or counter-clockwise, you rotate it 'up' or ...
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0answers
49 views

Convert a NO push button into an On/Off button

I'm building a boombox, and it needs a couple of switches for main on/off, voltmeter on/off and LED lights on/off. Since I don't have any metalworking tools I am going to buy a premade front panel, ...
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0answers
42 views

Switch based on battery voltages

I have two batteries. I would like a circuit which looks at their voltage, and puts them in parallel if they are the same. If they are not the same, the one with the higher voltage should be taken out ...
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0answers
26 views

Help understanding and building a switch circuit with the CD4066B

I am wanting to use a 4066 chip to control current flow through a circuit. (data sheet for the chip - http://www.ti.com/lit/ds/symlink/cd4066b.pdf) I will be inputting 3.3v into the control pins as I ...
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1answer
95 views

Shut off circuit when under a certain voltage?

I have three batteries wired in series, in order to produce 9v. If one of those batteries dies, I need the whole circuit to shut off. The best solution I've found is to use a comparator, but the ...
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0answers
16 views

Does a switch's Utilization Category AC-15 include a desktop PC?

For reasons beyond explanation, I'm trying to source an industrial limit switch to control the power to a desktop PC. It's run on a switch mode standard computer PSU. Most of the limit switches I've ...
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0answers
32 views

What on / off switch to use from a 2S Lipo to a Switching Regulator

Last time i used the Slide Switch for my application, everything worked well. The system has 2S (7.4v Lipo) Battery - Fuse - On/Off Switch - Switching Regulator - load ( Beaglebone + Wifi Module). ...
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0answers
28 views

3 way dimmer installation

I'm installing a three way dimmer on a 3 switches line for a light. In the dimmer notes the installation is done by replacing the three way switch on the load side. Can I replace the one at the line ...
0
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0answers
25 views

Solenoid Circuit: MOSFET switch help

I am trying to operate a 5V solenoid using a IRLZ44N power MOSFET. My problem is I cannot get the MOSFET switch to work. My circuit: 5V into solenoid and diode (1n4004) in parallel into the drain of ...
3
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1answer
145 views

Using a MOSFET to switch a High Voltage on a Capacitive Load

I am trying to bias the filament of an electron gun to -575 V, but I need to switch it on and off using a TTL signal. I have an idea for how to do it, but I would like to know if it will work before I ...
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0answers
22 views

Creating a pulse when the circuit opened and closed [duplicate]

I would like to send wake up and halt signal to a linux board. I just want simulate the power button on the board so I will replace it with a circuit. So: When I the car's ignition line is on it has ...
0
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0answers
30 views

PCIe switch connection

I have designed a board with a SoC (I.MX6) and a PCIe switch (PEX8605), everthing it's working in the board exept the PCIe switch, we can't even recognise it with lspci, dmesg..., so I wanna check if ...
5
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1answer
548 views

Rubber push-button

On lots of electronic devices, such as this Korg drummachine/sampler, there are some soft rubber push buttons. What are they called? (I'm looking for the most common name, so I'll can find them ...
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1answer
71 views

Request for guidance on sources to help me figure out how to do simple thing

I have 9 3w leds (white) and 2 1w leds (blue). I have one led driver with sufficient output to drive only the white leds (either in series or parallel.) Therefore, I figured I will get a separate ...
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2answers
83 views

When and how is a protective diode applied to the collector of a transistor switch?

I'm confused about a passage in "The Art Of Electronics", by Horowitz & Hill, regarding protective diodes in transistor switches: ...
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2answers
73 views

How can I protect a DC switch from arcing and sparks?

I have a DC switch that is being used as the main power switch for an audio amplifier project I am working on. The schematic is shown below. (a few things are wrong with that circuit, but have since ...
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0answers
28 views

Design of PWM controller for Wound Rotor Induction Motor

I want to make a controller for Wound Rotor Induction Motor in which effective external resistance on rotor side is varied by changing the duty cycle(PWM controller) with the help of a chopper.What ...
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2answers
44 views

Integrated TTL in SPDT-switch

Found a switch for a project, and want to make sure I understand it correctly. This is the switch: (Mini-Circuits SWMA-2-50DR+). Now, it has a TTL driver circuit with the inputs +5V, -5V, and TTL ...