Electrical Engineering Stack Exchange
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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.

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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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 supply of 9 VDC with an AC guitar signal. With…
Luke Galea
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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. The circuits are identical except for the…
steelswords
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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 controlled by a logic input. However, somehow this…
KSEEV
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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 circuit – Schematic created using CircuitLab I also…
Nick Bolton
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High-current analog switch

I'm looking for an SPST analog switch (or alternative device) capable of handling >=150mA (5VDC) across its switch, controllable by a logic-high signal. I've been looking on digikey, and haven't had much luck finding anything capable of handling…
MyFingerHertz
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Analog switch on an instrumentation amplifier input

I'm working on a project for school that involves a configurable input stage (AC/DC coupling and variable input impedance) connected to an instrumentation amplifier. I am wondering whether I will experience any major DC offset issues if I connect an…
Caleb Reister
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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 wire length limitations? RS485 is not an…
Noideas
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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 extended range of frequencies - 470Hz to 20kHz: It…
Ivan Demyachenko
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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 see many using input coupling capacitors with…
Steve S.
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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 can I correct that? On the second circuit I am replacing the…
Electrofreak
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Solid State Relay capacitance causing distortion

I designed a relay network board. The idea is to select one differential measurement points from a high voltage device. In order to do that, I used these solid state relays. You will see the board below: The board has two differential probes…
Alper91
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SD card communication failure with USB2244 and TS3A27518E

I'm facing a very peculiar issue on a hobby project of mine, and would appreciate any insight. The schematic for the relevant part of the project is attached at the end of this post. What I have is two microSD cards (J1 and J2 on the schematic)…
Michael Bikovitsky
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Programmable gain Transimpedance amplifier for 4-5 decade resistance measurement using Pulse voltage/current

As you can see from my previous question, I am trying to measure resistance within the range of 200k-60 ohms (around 4-5 decades). I will be using a pulse (5us pulse width and 50ns each rise and fall time) voltage source of 200mV (max) across the…
paulplusx
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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 signal of the switch, which will have as its inputs VCC and…
MPA95
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Measure battery voltage from a device that powers up/down periodically

I have a MCU that powers up periodically to log some data and then powers down (full power off -- not sleep). When powered on, it runs off a battery and I want to connect the battery to an analog pin on the MCU to measure its voltage, but I don't…
kr4sh
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