Questions tagged [switches]

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

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1answer
68 views

Discharging a capacitor to a battery supply [simple circuit]

If I have the following circuit... (resistor & capacitors values are made up) ...and I hold down SW3 until the capacitor is charged, then I release ...
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2answers
268 views

Passively Buffer Voltage

I am working on a project where I would like to use a single pole rotary switch as a mode switch, but also provide power to the MCU. By providing the common on the switch with 3V, I can identify what ...
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1answer
5k views

Wiring a 5 Pin LED Switch

So my problem is that I need to wire up a 5 pin LED switch to a motor and a car battery. Seems easy enough... But I need the LED to be on at all times. That is the bit I'm getting stuck with. ...
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2answers
778 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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2answers
3k views

Power N-Channel Mosfet as a Switch

I just want to use a BJT transistor to act as a interface between a microcontroller and a MOSFET. I need to turn on and off an N-Channel MOSFET for controlling a much higher current on high voltage. A ...
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1answer
254 views

How do I switch an 18V LED circuit on/off with the signal from my amp to my speakers?

I have an LED strip in my Peavey 6505+ guitar amp and would like it to only illuminate when I play my guitar. I could get 4 LEDs to light up well by just wiring them in to a 1/4" jack from the output ...
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2answers
980 views

Raspberry Pi GPIO

I need to make a connection between the "Device"'s 2 wires using a Raspberry Pi, but I am unsure how to go about doing this (and I don't want to just play about with it and get it wrong as I might end ...
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1answer
691 views

how to design switching regulator in battery operated device?

My device consists of ATMega, GPRS modem and sensors. Modem occasionally hangs and I need to reset it from mcu. The whole system is powered from li-ion battery. I can't find any switching DC-DC ...
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2answers
2k views

Switching RCA composite video, under uC control - circuit ideas & suggestions

Trying to use Arduino TV-Out to switch feed to a TV set, s.a. ones found in Clinics, to display some information, s.a. next patient, expected delays etc. The TV is normally playing regular programming ...
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3answers
3k views

Replacing a mechnical switch with a digital one

I have a circuit which allows me to manually (physically) switch between two VGA inputs (PCB push switches) to feed one VGA output (a standard commercial KVM). I want to be able to switch between the ...
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2answers
1k views

Can I use a silicon controlled rectifier to discharge a capacitor?

Can I use a silicon controlled rectifier to discharge a capacitor? If yes, can you provide a diagram of how this would work in, say, a coil gun?
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2answers
1k views

How to block/allow an i2c data signal to pass on to another device

I have three devices which I'm working on and one of them needs to control i2c communication between the other two. Each of the devices is based on an AtMega or AtTiny chip. The Controller (based on ...
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1answer
722 views

Shorting two pins using a headphone jack

I've managed to "build" a shutter release for my Canon SLR by shorting two wires connected to the appropriate pins on the Canon connector. I am looking for ways to extend this into an intervalometer ...
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2answers
430 views

4066N analogue switch rapidly switching ON/OFF when should be OFF

I have the following circuit that should light up two LEDs at the exact same time: (Edit: Removed incorrect 1.64V enable input because, though I now understand it's on the low side, it is not a part ...
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3answers
3k views

Switch 15V source with a MOS by digital 0/5V (dc)

I'm trying to switch on and off some 15V devices from Arduino Uno digital ports (0/5V). Each port must control a group of resistive loads (lights) of a train model. There are about 10 groups of loads, ...
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1answer
722 views

Using 1 momentary switch to toggle between two latched states. Plus relay question

I know there are many ways to do this, but I'm looking for the easiest setup, not necessarily the cheapest. I need to build a circuit in which a momentary switch alternates power between two 110v ...
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2answers
533 views

3 pins digital switch component for an Arduino project

I am trying to use a digital switch component to switch on/off SCL lines of some I2C sensors. On proteus, I can perfectly simulate that with a component name DSWITCH as shown on the attached picture. ...
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1answer
126 views

Resetting 555 via Transistor (optionally driven by Touchplate/Piezo)

Right now I am using a 555 circuit to generate a 1kHz square oscillation (not displayed below). Generally the reset is pulled down, but through a button I drive a transistor to output the square ...
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1answer
229 views

Switch array (crosspoint) and DC biasing of audio signal

For a project at my university, I am making a guitar effects switcher. Guitar effects work on instrument level audio signal which is AC only. I plan to use ADG2128 analog switch array (https://www....
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4answers
174 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 ...
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1answer
189 views

How to switch 7 wires with a single on/off slide switch

I am working on a project, where I want to build a raspberry pi into a nintendo 64 console, and be able to switch between with a single switch. By that I mean, I want to be able to use a single slide ...
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1answer
451 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 ...
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1answer
99 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 ...
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3answers
504 views

Micropuck LED driver gets really hot

I have a Cree LuxDrive LED powered by a 3.7V 750mAh LiPo Battery hooked up in a circuit with a latching switch. For some reason every time I turned it on, the driver gets really hot and almost starts ...
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2answers
651 views

Mosfet as switch for high output current

I'm working on an android controlled input/output/gauges manager for cars based on a pic24 micro controller. I'm really not an electronics expert so I had someone working on the schematics but he has ...
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2answers
117 views

Using switches installed across pins on AVR

I have the following layout, the switches are part of an existing hardware piece I'd like to reuse. I'd like to be able to detect button presses on the vol+ and vol- buttons. The plan was to actively ...
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1answer
369 views

Controlling NMOS gate switch with PMOS

The goal of the circuit below is to use a PMOS to turn an NMOS on and off which will blink the LED. A microcontroller is providing the square signal. Both MOSFETs are logic level and when I use them ...
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1answer
773 views

Caps on tactile switch

I know that caps do exist for 12x12mm tactile switches: and such caps are very standard, we can find a lot. But is it possible to fit caps on 6x6 mm or 8x8mm or 10x10mm tactile switches? (not sure ...
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1answer
220 views

What happens if the Forward voltage of a diode is not met?

Ihave been playing around with transistors and diodes lately, and thinking about switching methods and techniques. I'm not that educated on the matter of "Forward Voltage", but I illustrated a ...
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4answers
107 views

Distributing an electrical current? [closed]

New here and hoping you can help me out. I've been trying to work on a simple-ish PCB for a work project and need a hand. I'm trying to take one electrical input, and send it to 8 different outputs, ...
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3answers
1k views

How to/should I bypass switches?

I want to make a stage box (with light in it) so when the guitarist or singer steps on it, it lights up. In the box I want to use a 12W (or maybe later 2) LED lights (which have a normal EU power plug)...
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1answer
150 views

Light Activated Switch

Can I use a 12 V power supply as the source of electricity for this circuit? And where do I connect the positive/negative of my power supply? I'm a bit new to this so please understand, thank you.
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1answer
791 views

Soft latching push button circuit using 2 buttons

I'm building a control circuit for switching the VFD on my lathe. The latching push button circuit needs to use two momentary push buttons one for on one for off. I got a circuit working with a double ...
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2answers
349 views

Customizing Digital Thumbwheel Switches

Has anyone used a Thumbwheel Switch such as these: http://www.digikey.com/product-search/en?mpart=A7D-106-1&vendor=39 I am interested in changing the internal number strip. For examples I have ...
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2answers
63 views

How to convert light activated switch into dark activated switch [duplicate]

Can anyoe teach me how to convert this into light activated switch (https://i.stack.imgur.com/r6lZH.jpg)
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3answers
94 views

How To Make A Switch Close When Another Switch Close? [closed]

I want to use a rotary switch to switch between filters which I believe will give me different frequencies. But the problem is when I connect the positive feedback to the other filters too, naturally, ...
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2answers
301 views

making a switch [closed]

I am working on circuit, I need to make a switch. What I want it to do is; when the circuit is at 4 volts it goes somewhere and when it is 6 volts it goes somewhere else. I think I can use a BJT but ...

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