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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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 ...
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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 ...
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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 ...
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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 ...
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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 "...
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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 ...
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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 (...
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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 ...
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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 ...
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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 ...
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BJT selection for the reference circuit
I have simulated the below circuit in LTspice and found that the BJT (Q203) is having less power dissipation (~1mW) then the Q202 BJT.
However, the designer selected a 200mW package for the Q203 and ...
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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 ...
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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 ...
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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 ...
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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 ...
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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.
...
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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....
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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 ...
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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, ...
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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) ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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) ...
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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.
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How does a basic SPST analog switch differ from an ordinary switch?
In the test circuit I'm building there is a 1 kHz PWM signal passing through a DG467. As far as I know, the DG467 was placed there to interrupt the signal if needed, like an electronic on/off button ...
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N-Channel JFET analog switch clarifications
I've read a few other questions on here which helped me understand analog FET switches better but I still have a couple of questions/clarifications which I'd like to understand better.
Consider a ...
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Switching multiple I/O lines to one of two ports using one button?
I'm trying to design a switch box so that I can connect one input device (a Thrustmaster TH8A shifter for sim-racing) to two different outputs, with a single switch to change between them. I have a ...
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capacitor discharge circuit
I'm designing a capacitor discharging control circuit. Its principle is as follows:
Voltage monitor 1 function:
switch, Short 2 and 3 for less than 14.85v
Voltage monitor 2 function:
upper limit, ...
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Compact relay banks [closed]
I'd like to switch about 20-30 audio signals. By "audio", I mean non-DC that is low-voltage (<5V peak) and low-current (<50mA peak).
I'd like this switching to occupy the smallest ...
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Evaluating make-before-break impact
I'm exploring the possibility of using TI's TS5A3160 analog switch to implement a "buffer" for a square wave. The idea is, to use a square wave with a low driving capability as the control ...
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How to electronically switch the output of an LED driver between two different 10W LEDs?
I have the circuit in the image below working with the PT4115 driver. I use it to light a 10W LED from a 24V DC source. The LED draws close to 1A. I can control it with a 5V PWM signal from an MCU.
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Automatic multiple switch ON when power is applied
I have made a switch as shown in the schematics to turn ON/OFF 24 loads. When I apply a pulse on the ON-signal the load gets 24 V and when an OFF-signal pulse is applied the 24 V at the load gets ...
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Switching between Vin and regulating voltage when unit turn on
I am trying to find way to switch between power supply on common pin of overlay (or button). I came with simple p channel Mosfet circuit I just want make sure if this will work. (all overlay button ...
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Latching an analog signal on a trigger event
I am looking for sort of an analog equivalent of regular digital latches. I want it to mirror its input (voltage) to its output (voltage, with or without gain) only at a trigger edge/pulse and ...
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Can I control 5 V input on a CD4051 but power the IC with 3.3 V?
The datasheet of the CD4051 says:
Wide Analog Input Voltage Range: ±5 V Maximum.
CD54HC and CD74HC Types
Operation Control Voltage: 2 V to 6 V
Switch Voltage: 0 V to 10 V
In my circuit I power (...
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How to use current sources correctly
In this simulation the circuit generates a AC signal at "Electrode". Here I am using two SPDT-Switches (Ron = 4 Ω).
My first question: Why isn't the signal correctly rectangular? And how ...
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Analog mux with active low enable.I/P and O/P state when enable is High
I am using this mux (74LV4051D,118)from Nxperia for one of my applications.The functional table is given below.
When the Enable is High S0, S1, S2 are don't care, and the switch is off.
May I know ...
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Simulation of MOSFETs as high-speed switches
I’m trying to simulate high-speed switches (2xSPDT) made of MOSFETs.
The MOSFETs should switch so that while “I2” flows into output, “I1” flows into “U_1” (or vice versa).
I couldn’t interpret the ...
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Overvoltage on input pin of analog switch
I'm building a device, where I need to switch pin between analog signal 0 V-5 V and 12 V digital signal. I was thinking I could use a BL1551 (datasheet) or similar analog switch to shut off the analog ...
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Why does this NPN transistor operate differently if it comes before the switched element?
I'm simulating turning an LED on with a transistor switch in LTSpice. To my bewilderment, the current through the LED in Circuit 1 is ~51 mA and the current through the same in Circuit 2 is only ~6 mA....
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Pulling the common I/P of analog multiplexer/demultiplexer to Vcc
I am using an analog MUX/DMUX (74LV4051D,118) for enabling/disabling a transistor that is driving a reed relay.
The MUX_DMUX selection lines are controlled by Arduino Nano. The common input/output is ...
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CMOS (analog) switch output has a few hundred mV offset when output is disabled
I'm using an TS12A4514 CMOS switch in order to isolate some digital lines from one device to another. Power rails are 5V & 0V (GND).
While the switch is enabled (enable input is 5V), input ...
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Power switch for 8Pin ATX Connectors
What would be the best way to make a power switch for the 8-pin ATX Power Connectors? Can I just join all the yellow (12V) wires together and then use a high current switch to toggle them ON/OFF? Also ...
