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Questions tagged [analog-switch]

An electrical component which performs a similar function as a mechanical relay (conducts an analog or digital signal when on but does not conduct when off). Unlike a mechanical relay, however, it has no moving parts, and it may or may not provide galvanic isolation between the control signal and the switching terminals.

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Analog switch for controlling LED

I need help/suggestions for the implementation of my schematic: In the schematic image pasted below, particularly look only at the charging IC, boost converter, analog switch, and ATTiny 1616 ...
Tahoor Asim's user avatar
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A scheme to control a number of ceiling light bulbs being on with a single switch [migrated]

I have a ceiling light with two bulbs and only two wires (live and neithral) arriving to it (220-250v AC) and a SPST switch. I want to connect one bulb directly to those wires and I want the other ...
Hug you Nvidia's user avatar
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1 answer
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Level shifter (floating shifting ?)

I'm currently studying level shifters, and I have a question: Is it possible to design a level shifter that translates 0 and 5 volts to VSS (e.g., VSS = 5V) and VDD (e.g., VDD = 8V)? If so, could you ...
Nedou's user avatar
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1 vote
3 answers
134 views

Switch ELECTRICALLY SAFE between 3 resistive loads (16 A each) on a 16 A line

How to switch 3 resistive consumers (heaters), each having a current consumption of nearly 16 A alternate & ELECTRICALLY SAFELY (German standards)? So that only one of them heats at a time and the ...
Lux's user avatar
  • 111
6 votes
2 answers
298 views

Analyzing Diode Quartet Switch

I am trying to understand how this diode quartet switch works. I am having trouble dealing with the two current sources. I can think about what happens to the voltages in the circuit, but how do I ...
Axodarap's user avatar
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0 answers
38 views

Home a servo motor after power shutdown

Background: I'm trying to setup a servo motor 1171MG with a 555 timer and finetune the position with a potentiometer as it depends on various project aspects. The circuit is driven by a small board &...
Squiffy's user avatar
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0 answers
32 views

Power selector for 12V car battery and Li-Ion

I am currently using the following power selector circuit (based on this Microchip app note) to switch between a 5V (5V5A) supply and a Li-Ion 3.7V battery (...
Dan Alvarez's user avatar
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29 views

Better switch/mux type for laser diode

I recently designed and tested a laser driver board which can generate max 200mA current. One of the requirement was to be able switch that current source between 4 laser diode channels. I used ...
Derun Karabeyoglu's user avatar
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2 answers
66 views

Switching circuit with logic 3.3V control on p-channel JFET

The task is to derive sinewave (of higher frequency) chopped by step-function (also periodic but of lower frequency, i.e. several periods of sine wave are placed in that pulse). So I have a sinewave ...
Sombercy's user avatar
0 votes
1 answer
144 views

Timed momentary switch modifier

I would like to design a circuit that adds a power off delay What would you suggest, is it possible to solve that basing only on the circuits batteries? Modifier from the market uses own 9V power ...
JSK's user avatar
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3 votes
6 answers
1k views

Simplify one-time switch made using a flip flop

I'm trying to make a one-time, "turn-on-once" switch. I've made a simpler design before, but I seem to have lost it.  So basically, when the comparator is pulled to high, the switch turns on ...
Zipho Lunika's user avatar
4 votes
2 answers
546 views

Analog switch for AC

I'm looking for an analog SPDT switch which will block reverse current if in open state. The circuit operates in two modes: LED on (SW1 and SW2 in closed state) LED off (SW1 in closed, SW2 in open ...
Woyzeck's user avatar
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0 votes
1 answer
88 views

How to correctly switch between two analog signals before op-amp

I have two sources to generate a ramp signal to drive a voltage controlled oscillator. Source one is DAC of the STM32H743 and the second one is RF Synthesizer ADF4158's charge pump output. RF ...
Cenk's user avatar
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1 vote
1 answer
62 views

SN74LV4052APW as UART Switch

I am using SN74LV4052APW as UART switch with ESP32-S2 SoC Design. I have 3X UART in the design but since ESP32-S2 supports only two UART channels so I had to use this electronic switch to switch ...
Zunuran Nasrullah's user avatar
1 vote
0 answers
55 views

How do I interpret this analog switch logic diagram?

The following is the logic diagram of a single pole double throw analog switch that I am trying to use. Specifically what I am wondering is if it connects one of nY ...
Busti's user avatar
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1 answer
80 views

Gate switching - Guitar signal gate controlled by another signal

The circuit below is based on a noise gate and a JFET based switching circuits. The idea is to mute the guitar signal when another signal pases certain threshold of volume (like a reversed gate ...
Electrical Voyager's user avatar
2 votes
0 answers
35 views

Soft power-off compatible with two different hardware architectures

I've been tasked with designing a single PCB that will (amongst other) provide soft-power off feature to two different products with different hardware architectures. The notable differences between ...
Lars Petersson's user avatar
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1 answer
136 views

Optocoupler as switch

I am trying to use an optocoupler as an ON/OFF switch for an analog circuit. When high/ON voltage is applied at input, the output side should be short circuited. Otherwise it should act as OFF/open ...
Soham Ghaisas's user avatar
4 votes
1 answer
257 views

Understanding Leakage Current specification in analog multiplexers

I want to build an analog front-end with a 16 channel multiplexer. On each multiplexer input, there will be a voltage divider made from resistors. On the multiplexer output, there will be an op amp ...
Mau5's user avatar
  • 314
1 vote
2 answers
64 views

Scaling PWM amplitude using analog switch at MHz timescales

I want to scale the amplitude (the High level) of a PWM signal by switching the output of a DAC. I am using MCP4822 12-bit DAC to generate 0 - 2.048V and switching it using a SN74LVC1G3157 analog SPDT ...
itheo92's user avatar
  • 11
4 votes
3 answers
676 views

Optocoupler as a switch for composite video sources

I want to switch between 2 video sources (cameras) to a common video receiver. Is general purpose optocoupler suitable for that? Here is the schematics: In more details, the video switch is ...
brigadir's user avatar
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0 votes
0 answers
84 views

Multiple SP4T switches in single package?

I am trying to make my own KVM switch with DisplayPort connectors. I have 4 inputs + 1 output (bidirectional), so I need a SP4T switch (I have chosen the Infineon Technologies BGSA14GN10 (which is an ...
YANNTASTIC5915's user avatar
1 vote
1 answer
59 views

PMV20XNER MOSFET Overheating

I am using the PMV20XNER as a simple switch. I am driving a load of about 8 Ω from a 24 V power supply. A schematic is below: When I apply 3.3 V to the gate (which should be enough to turn this ...
Chris 's user avatar
  • 13
5 votes
2 answers
431 views

Load Selector/Load Switch

Following the provided schematic, my goal is to design a circuit that can determine the direction of a Pulse signal based on a control signal (CTL). To achieve this, I am utilizing two pmos ...
Nedou's user avatar
  • 316
3 votes
2 answers
91 views

What kind of switching system can I use for a massive array of high-impedance electrodes?

My application: I am attempting to create a device to map redox potential in soils at ~1 mm resolution, using a grid of platinum electrodes. Background: Redox potential is a measure of the "...
user278411's user avatar
1 vote
1 answer
129 views

Isolate current flow in Ltspice using switch

I am trying to control the flow of current by the switch SW, I have used an independent current source I. However the switch is ineffective to isolate the resistor R1, because the switch is basically ...
Avijit Das's user avatar
3 votes
2 answers
134 views

Electrically controlled switch for pH-meter calibration [closed]

I need to implement a very low voltage drop switch controlled by a microcontroller. I need it to connect (short) two nodes in my circuit for calibration purposes. One node is the input of an opamp (...
Andrea's user avatar
  • 145
0 votes
1 answer
92 views

What does this MOSFET circuit do?

I have an N-channel MOSFET (Q6) whose drain is attached to the gate of a P-channel MOSFET (Q3). BAT+ (at the source of Q3) is +12 V. What is it doing? Is there a way to accomplish this same function ...
wgthompson's user avatar
1 vote
2 answers
582 views

Using a toggle switch as a momentary switch

On my boat I have a 12 V to 220 V voltage converter which is tucked away behind a cabinet. This converter uses a remote control to turn it on or off. Now this remote control is connected with an RJ10 ...
Okke Bakkum's user avatar
0 votes
2 answers
110 views

Selectable battery backup on a PCB [closed]

I have a unique situation where I will lose Vin to my device/voltage regulator for about 10 seconds. I tried the following circuit thinking it would solve the issue by using a 9V battery and enabling ...
outgoingerror's user avatar
1 vote
1 answer
188 views

Switching 4 SCART inputs: analog switch ICs or relays for signal quality?

I need to build a SCART switcher (like this one here: Lotharek's Hydra Revised, but with fewer inputs, simpler - no fancy features, just switching between a few inputs, and cheaper). I have some ...
KotBehemot's user avatar
0 votes
1 answer
88 views

Circuit that holds a PIN to GND and leave it floating after power on

I need a simple circuit that during power on fixes a pin of an IC to GND and after a while leaves this pin floating. Another circuit should be the same, but fixing another pin to -VEE (-30 V) and then ...
mtx4's user avatar
  • 91
4 votes
2 answers
590 views

Performance of a back-to-back NMOS for analog switching

I wanted to make an analog switch in a pinch, so I cobbled together a quick back-to-back N-Channel MOSFET analog switch using junk box parts. It actually seems to work quite well. simulate this ...
Nick Bolton's user avatar
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1 vote
2 answers
113 views

Can this switching schematic be simplified with digital control?

This is a portion of the schematic of an old (80s) audio synthesizer/effect (Roland Juno 6). The two inputs are triangle waves (opposite phase). The circuit shorted by TR8 and TR17 is not shown for ...
Dimitri Petrucci's user avatar
1 vote
0 answers
72 views

How to model a single-pole, triple-throw switch in PSpice?

I would like to model the following circuit in PSpice: It is a single-pole, triple-throw switch implementation. I have tried to model it using Sbreak like below, however, I get a floating node error. ...
Efanatic's user avatar
  • 113
0 votes
2 answers
65 views

Why PCA9306 2.9V coming at lower side even after removing the pullup

Below is my schematic for PC9306. The high side is connected to 5V and it is going to an Arduino Nano. SDA from our ASIC is coming to J113 (SMA connector marked in RED). The voltage at this side is 2....
Confused's user avatar
  • 2,593
0 votes
0 answers
75 views

Relay activation and power step down

I have one single pin and I would need to activate a relay. After half a second I need to step down the voltage of the relay from 12V to 3.3V. I've been able to accomplish this task using an LTV6994 ...
mapomapo's user avatar
1 vote
1 answer
247 views

Self keep-alive MOSFET circuit

Is it possible to make a power-control circuit, that once activated by a switch will keep itself alive as long as there is an input voltage? Like an N-channel MOSFET that gets a one-off input to gate, ...
BewilderedEngineer's user avatar
0 votes
0 answers
68 views

Using an analog switch to charge/discharge a series of capacitors

My circuit requirement is very low power consumption to allow/disallow voltage (V1 which is variable 0-5 V) to go through some capacitors (cap1 and cap2) by controlling analog switches (DG2535EDQ) ...
Aalsubhi's user avatar
3 votes
1 answer
220 views

Connecting I2C sensors with the same address over 16-20 metres in a daisy-chain with 1 cable

I'm trying to solve the following problem: "How to connect 3 to 8 I2C sensors with the same address over 16-20 metres in a daisy-chain with 1 cable without having to deal with address clashes or ...
Noideas's user avatar
  • 109
1 vote
0 answers
148 views

Connect and disconnect Ethernet line

I need an IC to connect and disconnect the network cable line (TX+ and TX- lines to connect/disconnect) Can I use an analog switch IC?
hossein fathbag's user avatar
0 votes
3 answers
121 views

CD4066B switches in parallel to lower Ron

In a music synthesizer design, I use two CD4066B gates (with complementary control) to switch on or off a VCO control voltage. One is in series with the control voltage and the other connects the ...
Synthlink's user avatar
0 votes
1 answer
119 views

Circuit help for dual-role pushbutton

I would like to have a pushbutton play two roles: Power up my system by connecting battery power to the EN pin on a boost converter, which then powers an MCU Act as an input for the MCU when the ...
Andrew Mowry's user avatar
1 vote
1 answer
197 views

Best way to disconnect voltage source from GPIO when MCU is powered down

I need to measure a battery voltage (0.9 - 1.5 V) with a GPIO input, and the battery voltage is still present when the MCU is powered down. What is the recommended way to disconnect the battery from ...
Andrew Mowry's user avatar
0 votes
0 answers
286 views

Max switching speed on CMOS

Is it possible to generate a 500 giga hertz square wave on CMOS technology in order to switch a circuit? If not what's the max frequency CMOS can switch?
Charlizard's user avatar
0 votes
1 answer
51 views

Can we design multiplexer that input -vdc?

I'm research about signal 2 state(+V ,-V) .So I have a question about multiplexer.I know that multiplexer is Digital circuit then input and output must be only 0 or 1 But in my research i need Analog ...
Phongpit Sribua's user avatar
3 votes
2 answers
520 views

Square to triangle wave converter frequency range adjustment

I am working on a synth module that converts a square wave (generated digitally: High - 10v; Low - 0v; Duty cycle = 50%) to triangle wave output. I've found this schematic that works for an already ...
Ivan Demyachenko's user avatar
3 votes
2 answers
761 views

CD4066 has a simple A/B Switch with a simple design

I want to replace my mechanical A/B switch (lots of pops and clicks) for my headphone/speaker on my PC and I was looking into the CD4066 (cmos quad bilateral switch). I look at a lot of design and I ...
Steve S.'s user avatar
  • 163
0 votes
1 answer
196 views

Multiplex array of photodiodes [closed]

I have a linear array of 10 photodiodes that I want to connect to a single transimpedance amplifier to produce signals. I'm envisioning some sort of analog switching circuit (U2 in the diagram below) ...
Thomas Holle's user avatar
1 vote
1 answer
94 views

How to control high current voltage with small current voltage linearly?

I want to make an 18650 charger without a microcontroller for fun, I was designing a very simple circuit but I had a problem with adjusting the voltage if current/voltage excceds max current/voltage. ...
AhmedH2O's user avatar
  • 359