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Questions tagged [transceiver]

For questions about devices that are both transmitters and receivers.

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How have fiber optic bandwidths improved over time? [closed]

I want to build a sense of how fiber optic transceiver technology has improved over time, and what relevant physical limits constrain it in the limit. For instance, ChatGPT tells me that in 2010 ...
Jsevillamol's user avatar
0 votes
1 answer
50 views

Piezo tr switch no echo signal

I set this circuit to use piezo as transceiver. I can perfectly transfer the transmitter signal (10 burst pulse) but as transmitter still connected onto piezo , any reveived signal is disappears. When ...
ali demir's user avatar
1 vote
0 answers
56 views

Piezo T/R switch

I try to use single piezo as transceiver. Is this possible if i can T/R switch using FET or BJT ? I found this schematich but not sure if it works. https://www.researchgate.net/publication/...
ali demir's user avatar
0 votes
0 answers
61 views

Using piezo as range sensor

My objective is to use a single piezo as a transceiver and calculate the distance between the sensor and the object that sound echos from using time of fly. I use ...
ali demir's user avatar
3 votes
2 answers
75 views

Sending arbitrary bitstream to SFP transceiver: minimum bitrate?

I'm trying to use a Small Form-factor Pluggable (SFP) as the laser source for a homebuilt laser gas analyzer, which means I don't actually care about transmitting data. The plan is to send an ...
ewineteer's user avatar
0 votes
0 answers
73 views

How does CAN transceivers output CANH=3.5V and CANL=1.5V? [duplicate]

This is a questions that has been asked but did not find a clear answer. How it is the 3.5V achieved on CAN_H? Assuming there is 0.5V voltage drop on the internal diode, 0.1V on the internal MOSFET ...
Florin Adrian's user avatar
0 votes
0 answers
14 views

Load pull testing transceiver LNA input, impedance tuner DIY alternative

Transceiver vendors not always provide best components for input impedance matching in all variety of frequencies range that transceiver itself support, often provide impedance matching network ...
Tremax's user avatar
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0 votes
1 answer
78 views

Match 50 ohm impedance to LNA input impedance

I have following PCB version of circuit: on SMA input we have antenna strictly matched to 50 ohm, then we have regular RF switch IC, after RF switch impedance matching network and final stage is ...
Tremax's user avatar
  • 65
0 votes
1 answer
90 views

Is GND connection required for two independent modules to communicate in MIL STD 1553 protocol?

I use a Holt IC 2130 MIL-STD-1553 transceiver. When I connect only the A and B differential lines in two independent modules, I can't communicate between the two modules, but when I connect the GND ...
Electronx's user avatar
  • 756
1 vote
1 answer
61 views

Why doesn't the output of a step-up transformer overload low-voltage inputs?

I'm working on a proximity sensor using a piezoelectric ultrasonic transceiver. While looking at driver ICs, I came across the following example in the datasheet for TI's PGA460-Q1: On the righthand ...
danavee's user avatar
  • 155
0 votes
0 answers
84 views

Designing a circuit for wireless interrogation of a temperature SAW sensor

I'm currently working on a SAW-based temperature sensor. The gist of how it works is this: when the external temperature changes, the resonance frequency of the SAW resonator shifts. To detect the ...
Adrian's user avatar
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3 votes
2 answers
165 views

Difference between Single-supply and Dual-supply CAN Transceiver

I was about to choose the MCP2558FD CAN Transceiver for a personal project. I found on the datasheet the following diagram: If my understanding is good, I can use it as a dual-supply Transceiver. But ...
Bouboubi's user avatar
  • 154
1 vote
2 answers
189 views

What is the purpose of the choke inductor coil in this qrp radio transmitter?

After building and testing these circuits, I want to understand the purpose of the choke coil in these qrp trans(ceiver)mitter circuits. https://www.qsl.net/py2ohh/trx/curumim/curumim.htm I ...
Aditya Chugh's user avatar
1 vote
3 answers
450 views

Do I need to put a ferrite bead near a RS485 receiver device power pin?

I'm using a MAX3094ECSE+ RS-422/485 receiver receiver datasheet for an application that is receiving quadrature encoder wires. Those wires are power, positive and negative signals from quadrature ...
Suvi_Eu's user avatar
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1 vote
1 answer
54 views

What is the operation of this RS485 transceiver having this connection?

I am confuse with the R1 and R2 function. The "Direct Connection" wire is connected to another transceiver's DE/RE. When the DE/RE is high, driver is enabled, and when the DE/RE is low, the ...
yessi's user avatar
  • 11
2 votes
1 answer
77 views

How to connect a full duplex line driver

I need to use two line drivers for the communication between two PCBs. I am currently using MAX3081 from Analog and this is what I see in the datasheet: Image Source: Analog - MAX3080-MAX3089 ...
mdir's user avatar
  • 115
1 vote
0 answers
51 views

Is it possible to use RF signal wires to let a model car center itself on it using phase differences?

I'm looking for a way to let a model car (1/24 to 1/18) know how centered it is on a road. I thought about using a buried wire in the middle of each lane of the road. Would it be possible to detect ...
Luca's user avatar
  • 11
3 votes
4 answers
401 views

MAX3232 capacitors voltage rating

I'm having a doubt about the voltage rating of the capacitors of the RS3232 (a UART to RS232 transceiver). For C3 and C4 (storing the +- voltage rails for the transceiver), the never exceed voltages ...
Sandro's user avatar
  • 7,697
0 votes
1 answer
252 views

Can USB-to-SERIAL dongle be used to drive an RS-485 transceiver?

Pictured below is a simple arrangement used to read the Temperature sensor from the PC. Standard/Protocol is MODBUS RTU RS-485 Half-Duplex. I've used this arrangement with both modpoll.exe and ...
Noideas's user avatar
  • 109
0 votes
1 answer
101 views

WiFi Transmitter/Receiver [closed]

I want to create a small, battery-powered electronic device to detect the presence of AC voltage after a power outage. It would then transmit notifications to that effect. The two components of the ...
ChuckE's user avatar
  • 1
1 vote
1 answer
84 views

No light detected from 1310 nm IR optical transceiver AFBR-5813TQZ

I am trying to build a test application circuit for an AFBR-5813TQZ IR (1300 nm) optical transceiver. For now, I am only trying to verify that the transmitter works, so I have breadboarded the ...
Ahmad's user avatar
  • 13
0 votes
1 answer
250 views

Using transceiver between DALI and microcontroller

Does anyone have experience using a transceiver between a microcontroller and DALI bus? Please see the attached wiring diagram. I am not sure what is wrong with the circuit, but when I measure the ...
Mickolini's user avatar
1 vote
1 answer
162 views

RF design_output impedance of the SX1280 LoRa transceiver

I searched the datasheet of the Semtech SX1280, but I can't find the output impedance of the SX1280 (RFIO's pin). Where can I find it?
Steven's user avatar
  • 11
1 vote
1 answer
88 views

Estimating max total supply current of all CAN transceivers on the bus

I'm designing the devices that should communicate via a long CAN bus (500+ meters). The power (24V) to the devices is delivered via the same bus cable (UTP5e), by the rest 3 pairs. The limiting factor ...
Aleks Y's user avatar
  • 35
7 votes
3 answers
2k views

Must RS-232 devices use the same logic level?

I want to interface a microcontroller with the RS-232 COM port of my PC. My PC uses a 75232G IC, which uses +/-12V logic levels as per some multimeter tests. Currently I'm planning to use the ...
StefanoN's user avatar
  • 490
0 votes
0 answers
67 views

How do transceivers interact with the Ether bus in classic Ethernet?

I am reading Computer Networks 5th Edition [Tanenbaum/Wetherall] and there is the following diagram section 3.1 about classic Ethernet. I am a bit confused on how to interpret the physical connection ...
shafe's user avatar
  • 363
1 vote
1 answer
73 views

Transceiver VCSEL failure analysis

We've had a number of optical transceivers fail recently and I am trying to track down the cause. It has happened with two different models: HFBR-53A5VSEMZ (now obsolete), and the TSP-D1CH2-C11. Some ...
sbell's user avatar
  • 1,661
2 votes
3 answers
909 views

CAN controller with UART interface IC?

Recently I have new request to add CAN interface for communication, but there is no CAN interface in current MCU. Then I found I can add a CAN controller with SPI interface to achieve. My question is ...
user214577's user avatar
1 vote
1 answer
129 views

Operating QSFP-28 at data rate other than 25Gbps per lane

We are designing a custom board for AD9082 and serdes of which are mapped to QSFP-28 port.This board will communicate with FPGA board using QSFP-28 module. AD9082 and FPGA will linkup using JESD204C ...
Lalit's user avatar
  • 41
0 votes
1 answer
47 views

How can I improve my 20m transceiver microphone amplifier?

After weeks (on and off admittedly) of debugging, I finally figured out why my homebrew 20m transceiver was oscillating on transmit. Despite all attempts to improve grounding (I have a single copper ...
Buck8pe's user avatar
  • 1,694
3 votes
2 answers
1k views

Why are capacitors and resistors commonly used with CAN High & CAN Low lines?

I often see resistors and capacitors connected to the CAN high and CAN low lines but in my experience, communication between nodes is still functional without these components. Can someone please ...
Ernesto Ruiz's user avatar
3 votes
3 answers
1k views

How can I design a CAN BUS hardware interface for STM32? (TTL and CMOS issue)

I am designing a PCB based on STM32F446 and I want to include CAN BUS communication. I know I need a transceiver (from CAN_H and CAN_L to TX and RX) and a CAN Controller. I have thought about MCP2551 (...
Developing Electronics's user avatar
1 vote
2 answers
67 views

Kenwood transceiver output to amplifier buzzes when connected [closed]

My fire department uses a Kenwood TK690-H as a base radio. The system was used to (poorly) power 3 in ceiling speakers throughout the station. Recently, I rewired the paging system in the station with ...
Ramrod's user avatar
  • 225
1 vote
1 answer
386 views

What chip is this? I suspect it's a CAN transceiver

I couldn't find this part number after googling.. both chips appear to say: NXP A42/3C EVG000 (or EV0000) nD921 but it's hard to read. Here's a pic below. I'm guessing they are the NXP TJA1042, ...
K_T's user avatar
  • 185
1 vote
1 answer
265 views

What conditions can cause a PCB fuse to fail and act as a resistor?

Context: Tx circuit that shoots 24V pulses into a transformer to get 240V out of it. The purpose is to drive a piezoelectric transducer. The circuit itself has a fuse protecting it at the entrance (...
Simon MH's user avatar
2 votes
3 answers
334 views

CAN bus fault protection

Question: Is there a way to implement with discrete components the 70V CAN bus fault protection found in some transceivers, such as TCAN1051H-Q1? Background: We are using the CAN transceiver ...
lmlmlmlm's user avatar
0 votes
0 answers
116 views

Ethernet 100 BASE-TX Question

I'm using this Ethernet transceiver PHY to study the working of the RGMII interface. I just want to understand 2 things. 1. What would be the output and input differential voltage levels on the pins 2,...
user avatar
0 votes
1 answer
1k views

What is GTP short for?

Xilinx uses so called "GTP Transceiver". What is "GTP" short for?
t1fpga1's user avatar
  • 25
0 votes
1 answer
456 views

voltage translation 1.8V and 3.3V using passive/active components

I have a chip that operates on 1.8V Vcc and has a digital interface I2C that also obviously outputs 1.8V signals and receives 1.8V signals. The datasheet says anything above 2V on VCC or digital input ...
DEKKER's user avatar
  • 787
1 vote
2 answers
133 views

Horrible buzzing on custom car bluetooth

I've got an older vehicle that is wired for a CD changer. I'm using a few components to trick it into playing Bluetooth. Components MCP2025 Transceiver for car's LIN bus Regulates voltage (>12V ...
kevin's user avatar
  • 143
4 votes
1 answer
1k views

Troubleshooting CANbus 2B comms on ESP32-WROVER-based custom PCB (ABOVE WARN, ERR PASSIVE, BUS ERROR)

I am building an ESP32 WROVER-based custom PCB which includes CANbus 2B communications. This PCB is a copycat of my breadboard project. Though on my breadboard version, the CANbus works like. charm, ...
Stéphane de Luca's user avatar
0 votes
0 answers
412 views

CAN bus termination resistor

I'm trying to design a CAN device where the user can select which device is the beginning/end device and activate the 120 ohm resistor accordingly. I've seen some examples using a switch, but I'm ...
cy1125's user avatar
  • 201
1 vote
1 answer
850 views

Intra Pair Length Mismatch Tolerance For 12.5Gbps signals

I'm making a high-speed transceiver design and want some direction regarding layout of trace length from P to N. The speeds will be up to 12.5Gbps. I have been informed by a equalizer manufacturer ...
Chance K's user avatar
  • 141
0 votes
0 answers
59 views

RFM69HCW Digital IO connection setup

I'm working to setup an RFM69HCW transceiver with an ARM microcontroller. I've read over the datasheet for the RFM69HCW and I see that DIO0 is the interrupt signal, so I've broken that one out, but ...
richbai90's user avatar
  • 201
1 vote
3 answers
1k views

RS-485 communication with slave microcontrollers driving addressable LEDs?

I am trying to figure out how to achieve the master-slave configuration shown below. The aim is to individually address an array of 150 mA LEDs, driven by the IS31FL3265A PWM driver. For this specific ...
user11271728's user avatar
2 votes
2 answers
1k views

Maxim MAX3485ESA+T vs SP3485EN-L/TR

I have a question about the MAX3485ESA+T RS485 Transceiver. I ordered a PCB with a MAX3485ESA+T and the project doesn't work. The previous design was with a SP3485EN-L/TR and it worked well, but I had ...
Eli Saadon's user avatar
1 vote
0 answers
195 views

How to create an RS485-compatible line driver with an adjustable slew rate?

I need to make an RS485 compatible line driver, capable of 12Mbit/s with fast slew rate, but with the capability to reduce the slew rate to about 50ns rise/fall time when operating at lower bitrates. ...
Timmy Brolin's user avatar
1 vote
1 answer
42 views

Ethernet Transceiver Modem block scheme: 50:50 device in block scheme

This is a system architecture of the Optical Ethernet Transceiver Modem (OETM) which allows a bidirectional transmission of optical signals and electrical signals (Ethernet). Given an optical input ...
Anna Koroleva's user avatar
0 votes
1 answer
185 views

Invert signal from optical transceiver

I want to achieve electrically HIGH state in this receiver (Vo tag), when there is HIGH state in the fiber. What I get now is 5 V when there is no pulse in the fiber and 0.48 V when there is (RXVCC=5 ...
Jesús Álvarez's user avatar
0 votes
1 answer
60 views

force output on a MAX3232 RS-232 transceiver

I need to probe the output RX (DOUT1/2) nets (connected to one MCU's UART) of a MAX3232 RS232 transceiver, for this I'll use the PCB test points, but I'd also like to "force" logic levels on ...
strange_bakery's user avatar

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