Questions tagged [bidirectional]

Bidirectional implies that a single pathway allows for power or signals to flow in both directions.

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Issue from my buck/boost converter

After my simulation, I am getting this in my output, which does not look good at all. I find it difficult to find a spice model for DC/DC isolator that can give me a positive, negative supply, and ...
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2 votes
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79 views

1 wire to 2 wire bidirectional UART

I'm working on diagnostics program for my old GM diesel, the old GM diagnostics uses a 1 wire bi directional serial protocol, 5v HIGH, 0v LOW, with the PCM data line being held high when idle, and the ...
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MOSFET heats up quickly in High power 14V DC-DC bidirectional charging circuit

I am currently design the following circuit to charge a 14V LifePO4 4 cells battery while running a high power motor at 14V 24A. There are some issues that I am currently facing: Without any diodes ...
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250 views

Using bidirectional optocoupler instead of two identical optocoupler

I have two types of PNP & NPN proximity sensors and intend to use one connection socket for both types. I design a circuit with two normal optos for each line however to save the parts and space I ...
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(Update)Using a bidirectional optocoupler for attaching any PNP & NPN sensor type [duplicate]

I have two different 12 V PNP & NPN proximity sensors. My first design was for each sensor type, having an identical PCB design with a normal optocoupler with a dedicated wiring arrangement. My ...
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resistor type and wattage for VM & VS* inputs on TB67H410 motor driver

I am looking to use a TB67H410 for a T-Jet flow control valve rated at 12V/2.5A. I will be using an ESP32 running on 3.3V. I understand most of the datasheet, except for the VM & VS* pins. As far ...
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2 votes
1 answer
81 views

Bi-directional Line Termination using series resistor (s)

I am designing a PCB for an ST micro MCU with external SDRAM. On the demo board, ST is using one(1) series resistor termination for the bidirectional data lines. ST places this resistor at about 30/70%...
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Bi-directional Three State IO and microprocessor gpio

I want to use an MP5010B Electronic Fuse IC. I will enable or disable it by using the Enable/Fault pin which is billed as a bi-directional three state IO. I will enable or disable this pin using a ...
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How to form a 8-Bit bidirectional shift register using two 4-bit bidirectional shift registers?

I really had some trouble with one design question in my homework (the deadline has passed). We were asked to design a 4-bit bidirectional shift register using D-Flip flops and after that to create a ...
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5 votes
1 answer
166 views

A simple analog neural network to implement the XOR operation

I am reading this paper and wanted to replicate some of the results as part of a learning process. I'm more of a digital guy but obviously have had some analog design as part of my studies. ...
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1 vote
1 answer
385 views

Two directional FET switch. Is it possible?

Is it possible to have a high side MOSFET switch that will allow any direction of current? I was trying to design one but without the success. Or should I use a relay?
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2 votes
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Is there a simple IC for disconnecting a power source?

I'm looking to create a simple circuit to connect/disconnect a power storage capacitor to/from a larger circuit. In the model railroading world, we use capacitors as "keep-alives" to keep ...
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93 views

8-bit quasi-bidirectional I/O port

The schematic attached is from a very old device. It's using the microcontroller SAB 80535. According to the datasheet P5.7-P5.0 is an 8-bit quasi-bidirectional I/O port. There's a keyboard, a LCD and ...
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Digital isolator says it is bidirectional but its block diagram does not follow that statement

I am wondering if ADUM1285CRZ is Bidirectional or unidirectional digital isolator. It says it is Bidirectional, but the block diagram says otherwise. Tha datasheet block diagram shows one direction ...
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Analogue switch TS3A475 does the direction matter?

Does the "direction" of the signal matter? signal is 1/3Vcc to 2/3Vcc
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Bi-directional on/off toggle soft power latch

I need a one-button on/off toggle power latch to connect/disconnect a 36V battery to two VESC-controlled 500W motors with regenerative braking. Most of the designs I found for soft latching circuits ...
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3.3V to 5V logic level shifter with 3.3V microcontroler board and 5V arduino sensor

I would like to use logic level shifter like the one above. 3.3V logic level would be connected on NodeMcu 3.3V microcontroller board pin, while 5V level would be used for Arduino sensor. What ...
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Bidirectional buck boost converter [closed]

I am searching for a bidirectional buck boost converter evaluation board for charging and discharging the batteries. Input= upto 30V DC Output= upto 10V to 20V DC Current= less than 10A I always ...
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121 views

VFD Motor Bidirectional Control

So I have a control panel which controls the speed and direction of a motor in a sliding mechanism. the direction can be inverted using a tri-state selector on the panel. the selector input is a ...
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232 views

Common Source vs. Common Drain for N-Channel Switches

Most discrete load switches I have seen (Using N-Channel FETs) have been in the common-source configuration. What, if any, are the operational differences between this and the common-drain ...
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1 vote
2 answers
489 views

How to control the non-isolated bidirectional buck-boost converter?

I have been working on a control software for below given bidirectional buck-boost converter. The planned usage is for charging and discharging of a traction battery in electrical vehicle. I am not ...
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Power factor down after solar connection

We installed solar plant in factory. After that power factor goes down to 0.16. Normally it never goes below 0.85 in history even if we keep APFC off. We always maintained it to 0.99. Note - Main ...
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-1 votes
1 answer
152 views

SMD potentiometer direction

I currently struggling with a circuit and trying to identify the parts which may cause the problem. The circuit needs a trim potentiometer. Mine looks like with the symbol Does the direction have ...
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4 votes
2 answers
161 views

Bi-directional electronic switch for external circuitry

I am in the process of designing a PCB that is powered by a 10V / 1mA supply from a fandeck (incorporating EC/DC fan motors). One of the functionalities include having continuity between 2 pins on ...
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3 answers
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How does an auto bidirectional voltage translator work?

I'm trying to understand how the auto bi-directional voltage translators work. Background: I have to choose a part that can translate signals in both ...
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1 answer
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How to make a bidirectional power switch for negative supply rail controlled from logic level MCU

I'm looking to build a bidirectional power switch for a negative power rail. I have a +12V, +5V, +3V3 and -5V supply to switch. For the positive supplies, I'm using two P-channel mosfets in a common ...
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1 vote
1 answer
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Question about bi-directional pin from Roth reference

I now am studying the tri-state buffer from the reference "Fundamental of Logic Design", 6th edition, By: C. H. Roth and L. L. Kinney. I found that circuit of a bi-directional pin as application of ...
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1 vote
2 answers
867 views

How to find a truly bi-directional level shifter?

I'm trying to create an interface PCB to a 32 channel USB GPIO device which has 3.3v IO, and I want the flexibility to use 1.8, 3.3 or 5v - across all pins, or at most in 2x banks of 16 - I don't need ...
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DC Motor Controller: hacking it bidirectional?

I just picked up two of these DC motor controllers (https://www.amazon.ca/Controller-Yeeco-Universal-0-01-1000W-Generator/dp/B00RZ97DDQ/ref=sr_1_10?dd=1QzB1w0bE3cxmYrmXew-NA%2C%2C&ie=UTF8&qid=...
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Can I use TXB0104B bidirectional level shifters on the Intel 8085 NMOS CPU buses?

I want to connect an old Intel 8085 CPU to an FPGA board. The basic issue is that the 8085 works at 5V while the FPGA will not accept any voltage avobe 3.3V so I decided to use the TXB0104 / TXB0108 ...
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state-space model for bidirectional buck-boost with input capacitors

I'm having some trouble simulating the behaviour of a bidirectional buck-boost converter for battery charging purposes. The circuit looks as follows: I would like to create an averaged state-space ...
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2 votes
0 answers
255 views

How can I size the current ripple of a DC-DC converter for lithium batteries

I am designing a bidirectional DC-DC converter to charge and discharge batteries on a DC bus. The power of this converter is 50 kW and the average current in the inductor (the same as that on the ...
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1 answer
2k views

bidirectional buck/boost converter vs separate buck and boost converters

I have recently leared about bidirectional buck/boost converters. They can be used in hybrid vehicles for optionally charging a 12v battery from a higher voltage battery or vice versa. How would one ...
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2 votes
1 answer
2k views

Verilog - connecting multiple bidirectional buses

I've been designing a retro computer in verilog as an exercise and so far have a simple 8-bit CPU that communicates directly with a single RAM chip via a bidirectional data port. This works great in ...
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256 views

Transmission gate simulation

When the voltage on node n-mosfet is a Logic 1, the complementary Logic 0 is applied to node active-low n-mosfet, allowing both transistors to conduct and pass the signal at IN to OUT. When the ...
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How do the parasitic elements behave in a bidirectional power switch made from back-to-back MOSFETs?

I would like to know how to determine the value of the total internal gate mesh resistor (Rg) and different parasitic capacitors especially Cgs and feedback capacitor Cds of a bidirectional power ...
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1 vote
1 answer
4k views

in SPI, can MOSI and MISO be connected together?

I'm using an 8051 series microcontroller, and documentation states that if I use serial mode 0, then its RXD pin can function as a bi-directional pin (both input and output) while TXD is strictly a ...
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2 answers
1k views

Replacement Triac

I have a simple dimmer module with a busted Triac MAC97A6. I want to replace that component so that the module will work again but stores near my area don't have that specific component. One store ...
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Choice of the right stepper motor

I need to make a precise angular rotator for my directional antenna. The goal is to rotate the antenna at a precise angle. Arduino stepper motor library has functionalities to run a stepper motor for ...
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0 votes
1 answer
1k views

Bidirectional USB Type C charging

Recently I bought a ready PCB that is basically a power bank when 18650 batteries are connected This. It has a micro USB port to charge the 18650s and two USB type A one of which output is 1A and the ...
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1 vote
2 answers
1k views

Pull-up resistors needed for quasi-bidirectional push-pull PCF8575/PCF8574(A)

I wonder if I need pull-up resistors when using the PCF8575 I/O extender. It's not directly mentioned in the datasheet (http://www.ti.com/lit/ds/symlink/pcf8575.pdf). The datasheet does remark that ...
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3 votes
2 answers
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Does the Bluetooth protocol inherently support bidirectional data transfer?

Bluetooth is used for a lot of devices that send data in one direction: keyboards, mice, headphones. If it was designed for that, I would think that it was originally specified to only send data in ...
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0 votes
1 answer
167 views

Reverse current in a wire (flip flop current directions)

I'm working with 0 to 5 volts. I was wondering if there was any way, preferably with transistors, less preferably with ICs, to "flip flop" the 5 voltage magnitude across a single wire. For example, ...
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2 votes
3 answers
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How do you find out if a MUX is bidirectional

I've used this MC74VHC157 in a project thinking this would be bidirectional but I'm not sure. How do you find out if any MUX is bidirectional?
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10Mbps bidirectional wireless transmission with an MCU [closed]

I have a Teensy 3.6 microcontroller it has the following specs 180 MHz ARM Cortex-M4 with Floating Point Unit 1M Flash, 256K RAM, 4K EEPROM Microcontroller Chip MK66FX1M0VMD18 (PDF link) USB High ...
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Help with Flash memory to GPIO pins on FPGA dev board

Been trying to access the FLASH memory on this DE1 dev board, but having no luck. I'm using this to interface with a Super Nintendo system, and I'm trying to read a small test ROM file stored on the ...
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0 votes
2 answers
831 views

Can I drive MOSFET gate with an isolated voltage source?

I have two N-channel MOSFETs. I want to make a simple bidirectional solid state relay by using them. I want to place them back to back as seen in the schematic below, and drive them with a controlled ...
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1 vote
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Bidirectional Converter Switching problem on Mosfet

I want to ask. I designed a bidirectional converter with synchronous buck converter as the circuit configuration. The problem is, the switching mosfet. When i applied lower voltage at the input (10V), ...
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1 vote
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592 views

Analysis of a Bi-directional DC-DC converter

I'm building a bi-directional DC-DC converter that will be used to charge and discharge a supercapacitor stack. The design we came up with uses a 4-quadrant chopper, to allow buck-boost both ways. I'...
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1 vote
2 answers
1k views

help me make a bi-directional motor circuit? [closed]

the first circuit is supposed to make the motor moves clockwise and anti clock wise according to the potentiometer. the figure's components are IC1: 741 op-amp Q1: TIP3055 NPN Q2: MJE34 PNP (yea it's ...
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