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.
154 questions
3 votes
1 answer
182 views
Switch for CAN bus
I'm trying to route two CAN bus (CAN-H, CAN-L) lines to a single line. To achieve this goal, I'm designing a switch made up of PhotoMOS (model AQY212S or similar). This is the design: simulate this ...
- 301
3 votes
1 answer
194 views
Control voltages for for driving a CD4067B multiplexer
What control (address, enable) voltages do i need if i want to drive a CD4067B that is powered with +/-12V? The datasheet is confusing. Is it 0V to VDD or is it VSS to around 0V? The part only accepts ...
- 307
1 vote
1 answer
80 views
Muxing PCIe differential reference clock and Power on the same signal line
We have a case where the Mini PCIe plug-in card outputs a voltage (power) on the Mini PCIe 100MHz REFCLK+ line. This means instead of an input clock signal, this can also be a power output! This is ...
- 304
6 votes
4 answers
491 views
How is saturation defined for a bipolar transistor?
Considering this output characteristic of a BJT: Image taken from: https://cdn.sparkfun.com/assets/d/5/e/5/d/BC547.pdf and adapted. It has no real practical value, but: how is the "saturation ...
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1 vote
2 answers
125 views
How to make two components trigger together?
I have a feedback circuit for a device I am designing. The goal is to sense temperature changes with thermistors and then if certain conditions are met I want to use an analog switch to disconnect a ...
- 305
6 votes
3 answers
1k views
FET Switch Not Shutting Off
I am looking at a circuit that seems to be having a problem. This circuit is being used to switch a supply from an automotive battery. It delivers voltage to a quite dynamic load, normally at 6A but ...
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0 votes
1 answer
105 views
Will disconnecting USB host make the device go into "Suspend" mode (CH340G)
I've a sensor MCU which cannot be reprogrammed. That MCU constantly sends values over Serial and doesn't care if there is another device listens or not. The whole device is powered by an onboard AC-DC ...
- 912
2 votes
0 answers
110 views
Interfacing to an Antique Phone
Hello fellow engineers, I have a project where I'm trying to create a "virtual exchange" for these ancient Ericsson wall mounted telephones. The virtual exchange is based around a RasPi ...
- 21
0 votes
0 answers
38 views
MIC2309 I-LIM Pin Voltage/Current for Resistor Wattage Selection
For the MIC2039AYMT, I'd like to understand the voltage and current characteristics of the I-LIM pin, as this will help me determine the appropriate wattage rating for the external resistor. Currently ...
- 1,947
4 votes
1 answer
195 views
MCP73871 Low Output Voltage When Using Battery
I designed a board based on the MCP73871 (datasheet) that seems to not output a proper voltage when the only source is the battery. Here is the schematic. Note that, during the described testing, I ...
- 819
8 votes
1 answer
129 views
What are the other MOSFETs doing in the HC4066 analog switch, compared with the HC4016 transmission gate?
I never noticed this before... the 4016 analog switch contains two CMOS transistors as a transmission gate: But the 4066 analog switch contains 5 or 6 transistors: CD74HC4066: 74LVC1G66: SN74HC4066 ...
- 14.5k
2 votes
1 answer
145 views
Conflicting Logic Thresholds in MAX4514 Datasheet for +12V Operation
I'm planning to use the MAX4514 with a +12V supply to reset integrator and sample-and-hold capacitors. In the "Logic-Level Thresholds" section, the datasheet states: The logic-level ...
- 447
1 vote
2 answers
138 views
stacking up switches in an analog switch
I want to use an analog switch to short out resistors in a resistor ladder and create different resistors with doing so. My resistors in one range are 10K, 20K, 40K and 80K so I guess on-resistance ...
- 375
0 votes
1 answer
115 views
Control thermostat with two separate temperature sensors
I have a thermostat that is controlling a heating element that is heating two separate zones. The thermostat only has one temperature sensor input. I would like to send the resistance value of the ...
- 109
5 votes
4 answers
712 views
I need help understanding a transistor logic circuit. What is the reason behind diodes D1, D2 and D3?
I am trying to understand what is happening with the buzzer control circuit in Figure 2.95 from The Art of Electronics, 3rd edition which "simulates" a seat and car door alarm for a car. ...
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