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

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1answer
17 views

Toggle state between two circuits with two momentary switches

I have two circuits each with their own 1.5v power supply. I would like to toggle state between the two circuits with a switch, so that hitting a momentary switch turns the light off on one and turns ...
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2answers
94 views

does half bridges ICs exit?

i can't find any half bridge ic (with integrated fets) for low power (2w around 12V), all i find is full bridges for the same power magnitude. and i don't even find them under the name of full bridges ...
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2answers
25 views

Reducing parasitic capacitance in momentary latching circuit

I'm using this circuit (http://www.edn.com/design/power-management/4427218/Latching-power-switch-uses-momentary-pushbutton) to get latching on/off behavior from a standard momentary switch (an Omron ...
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1answer
76 views

Relay or Transistor for DC Resistive Load?

I'm building a circuit that includes a resistive load that I have to switch, which is going to be supplied with ~200 VDC and 0.1 Amps. I've looked at different mechanical relays, and typically they ...
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1answer
26 views

Reverse current protection on power-switching MOS

It was suggested in "Select power supply voltage using MOSFETs" that a second MOSFET can be added in series to prevent reverse current flow. My question is, can I just reverse Drain and Source on the ...
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1answer
35 views

24V proximitiy switch, NPN transistor, Arduino interrupt input

I build circuit which take proximitiy sensor as input to circuit (24V). With this 24V we switch on and off NPN transistor. On the side is Arduino with interrupt enable when pin is LOW. So I need ...
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2answers
41 views

What type of switch am I looking for?

So I am making an audio switch, and I need a switch that takes 3 dual inputs and outputs one of them, or vice versa, taking one dual input and outputting it to one of three outputs. It needs to be an ...
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2answers
45 views

How to read decade counter with minimum pins

I just obtained some of these counters for a project: They have five connections for each slice labelled C, 1, 2, 4, and 8. As you increment the digit, the pins for the appropriate binary encoding ...
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0answers
24 views

Is there something similar to this NVR switch, with SPST? [closed]

I currently have a product that fits my requirements, but I do not need the extra functionality/cost. It is a no voltage release switch, that when losing voltage to the circuit, requires a manual ...
0
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1answer
23 views

quick question about AC SPST rocker switch

I'm replacing the motor control switch in this toaster and wanted to be certain about how it should be installed. It's a normal SPST neon rocker switch with A, B and C for terminals, and B-C being ...
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1answer
78 views

Coffee machine wiring diagram

First of all I am a beginner in electronics / electricity. I am currently trying to connect a coffee machine to a Raspberry Pi powered relay. No problem with that, but as I am going to put apart and ...
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2answers
29 views

Drum trigger controller

I'm planning to make a drum controller (something like arduino) for pc using a piezo transducer as sensor, some electronic circuit, keyboard PCB connected to usb and sampler for drums in pc. I found ...
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4answers
58 views

Inerfacing switch & led with any controller

I am trying to interface switch and led. I want to write a program in which if I press and release the switch led should glow and if I again press the switch led should turn off. I am not able to ...
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2answers
38 views

controlling a DIY spot welder with a momentary push button switch?

I have a 240v to 12v transformer even bigger than a microwave transformer and i want to control how long it is switched on for in the range of 50-300 milliseconds to spot weld things. I was thinking ...
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1answer
47 views

JFET Audio switch, does not work in simulation?

This is a circuit I've found online and apparently it is taken from the very rare audio book by National semi. The circuit is used to switch a signal on and off at a transition time that the user sets ...
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1answer
40 views

Is there a pushbutton that does what a latching relay can do?

Is there a small (around 1 cubic inch) pushbutton that does the same function as an NVR (No Voltage Release) switch or a latching relay? Functions needed: -Must press button when circuit loses ...
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1answer
49 views

Help with On/Off Flip Flop Switch

I'm still fairly new to electronics and have been teaching myself as a hobby. Currently I'm working on a project that detects a red laser beam, and once detected will turn AC lights OFF if they're ...
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3answers
52 views

Protecting complementary MOSFET switch

I have a complementary MOSFET switch that turns ON/OFF a DC voltage offset of 2.25 V that is provided to another circuit. The switch is controlled by a digital signal, Vctrl, from a PIC18. Simulation ...
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2answers
31 views

Circuit with switch - express the current for different times

Consider the circuit below consisting out of a capacitor C and two identical resistors R. For \$t<0\$ the switch is open and the capacitor is uncharged. At \$t=0\$ switch is shut and the circuit ...
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1answer
41 views

Good way to switch AC/DC (Rectifier) in welder

I am building a homemade welder out of microwave oven transformers. I would like to have ideally an on off switch and then an AC/DC switch or just having one switch would work too. AC 120V 60Hz ...
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1answer
53 views

Z80 Binary Front Panel Design

Hello fellow engineers, I need some design design help with a Z80 based computer I am building. It will feature a binary Front Panel. The following functions may be performed via the front ...
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2answers
47 views

Two limit switch signals affecting each other

I'm trying to make circuit which will allow me to sense some platform presence at the ends of some rail. I'm using the limit switches, here is schematic: SENS-* signals connected to MCU pins, that ...
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2answers
35 views

Load switch correctly wiring

I need to use this load switch http://www.semicon.toshiba.co.jp/info/docget.jsp?type=datasheet&lang=en&pid=TCK106G . This load switch will be controlled by an MCU. Since at startup MCU have ...
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1answer
39 views

Substrate Connection when driving a Bi-Directional Switch

I am very confused about the way the below circuit functions. Below is an excerpt from a research paper which shows two NMOS transistors connected such that the body diodes face each other back to ...
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1answer
69 views

LED and light bulb in series

I have this electrical system: a switch connected to a 120V 60Hz 21W light bulb. I wanted to add two outlets one for a LED, another one for something else like a laptop or a fan. I tried to plug in ...
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2answers
127 views

How a transistor works?

I know this question is asked a lot and answered well in many posts, however, I'm still confused. A switch transistor works by using a semiconductor to pass the current from an emitter to a ...
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2answers
81 views

Need a switching device. Should it be a relay?

I am trying to build a system where first i would charge the battery (3.7V,40A), and then discharge it through a high wattage Resistor. For this purpose i will be connecting a power supply (15V-50A) ...
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1answer
18 views

Operating flow switch on a DC voltage

I plan to buy a low flow switch for my heater protection from Mcmaster (2371K4, 0.1GPM set point). The catalogue says that the switch operates on 120/240VAC supply. Would this switch be able to ...
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0answers
39 views

Low-noise SPDT switch

I need to produce an extremely low noise SPDT switch. This switch will take two different inputs to a single 16 bit ADC. The inputs are 50 ohm BNC outputs from trans-impedance amplifiers. The ...
0
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1answer
53 views

Reverse audio jack for front and back speakers

My problem is a strange one. I have a computer connected to front and back speakers via 3.5mm audio jacks. Sometimes I use the computer with the monitor at my desk. Other times I'm using it to watch ...
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2answers
91 views

NPN transistor: collector current flowing to emitter without connecting base?

I have a circuit where a LED has its cathode connected to the collector of my C8050 (or SS8050) NPN transistor, with the emitter grounded. Even though the base is left floating, the current is still ...
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0answers
31 views

circuit for switching on and producing desired high pulse then circuit turn off without using micro controller

i have no prior knowledge about electronics , but i am trying to make a circuit that turns on the switch after 10 seconds and then produce a desired length high pulse say 30 seconds then it turn off ...
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1answer
40 views

Switch high frequency AC on/off at zero crossing

I have a 3 phase generator which is powering some system. (50Vrms @3A, with variable frequency from 50-5KHz). I've used mechanical relays to control each phase to the load. However, there was no real ...
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3answers
69 views

Is it possible to change direction of DC motor using a 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 anything. When it's on I, the middle pin is ...
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2answers
63 views

6 pin vs 9 pin switches

So I currently have a 9 pin switch, that looks like this: And the project I'm doing calls for a 6 pin switch like this: I'm kind of an electronics newbie and I was wondering if I could just use ...
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votes
1answer
37 views

Is matching an infinite switch rating to a heating element required? [closed]

I want to use a Robertshaw universal infinite switch rated at 15 Amps to power a heating element to boil water in a stainless steel tub. The voltage is 240 VAC. A heating element greater than 3600W ...
0
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1answer
127 views

5 pin push button switch with LED AC wiring question

Thank you in advance for any help you can give. This is really my first project like this. I built a shelf in my house based on this picture. and I'm integrating an Eddison bulb lamp into the ...
0
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1answer
72 views

How to wire unusual R13-112 rocker switch

Can someone assist me in wiring this switch so the indicator and load can "light up" from 12V battery. By using terminals 1 & 2 I can power on the unit but I have no indicator light. Thanks
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votes
1answer
47 views

What is the right way to wire a power inlet to a switch to a dual-primary transformer?

I have a fused power inlet with a voltage selector (Schaffner FN1394-10-05-11). I want to connect it through a separate DPDT switch to a transformer with dual 115V primary windings, and make ...
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1answer
38 views

Turntable Circuit

I have a 33 rpm turntable and I would like to put a switch in it to play 45 rpm records. I don't know where to start. I would appreciate some help with which electronic components I'll have to buy.
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1answer
100 views

Using a Normally Closed PCB mounted Solid State Relay

Summary: Continuing my search for a solution to my problem, I have landed on normally closed solid state relays (NC 1 FORM B SSR). Could you tell me if I'm doing this right? What I need: What I need, ...
0
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1answer
59 views

Having to double press a tact switch?

I have created a simple circuit consisting of a 4017 ic, a tact switch, and arduino. The arduino is just for debouncing purposes. For some reason i have to double press the switch for the input to go ...
0
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2answers
47 views

How to seamlessly switch between dc lipo power sources

I have a question which has been asked a few times on here with some very detailed replies ...which would be great, if I had any idea what they meant! I've been building my own RC FPV setup and ...
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3answers
106 views

PNP Transistor Leak

I have a problem with a circuit that should be simple but has caused me some annoying problems. Summary: I need a switch that closes when the power is off and opens when the power is on. My solution ...
10
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4answers
1k views

Why are some generic door alarm magnetic switches built using Normally Open reed switches instead of NC type?

Some generic, low-cost "door alarm" magnetic switch components are made of using "Normally Open (N/O)" type reed switches, ie, when the magnet is in proximity, the current stops flowing. If I were ...
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1answer
33 views

working of Relay switch for driving high voltage ac appliances

Explain the working of relay switch for driving high voltage ac appliances? also explain how it works in embedded system?
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1answer
49 views

Connect arduino to COM pin of a NO NC button

I probably have a basic question but i'd like a confirmation on my solution. I have finished my arduino breadboard prototype which is using some basic momentary push buttons along with pull down ...
0
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1answer
78 views

What happens to the output of Optocoupler input voltage is negative

Here is an example of circuit using VIshay Optocoupler 4N25 5V to 3.3V GPIO Output (Inverted) Logic +5V Input ---> 0.0V output GPIO LOW +0V Input ---> 3.3V output GPIO High What happens to ...
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1answer
72 views

High Side P Channel MOSFET damaged after turn off

The circuit below is a power switch controlled by a push button. Basically, the switch (Q1) is controlled by a On/Off IC controller. During testing on the real circuit, a DC Electronic Load is ...
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1answer
25 views

“Buffering” spikes between switch positions

I'm using a 6 position 2 pole rotational switch to change the resistance of two input voltages. Each position adds a resistor on each input, thus increasing the overall resistance and lowering the ...