Questions tagged [level-shifting]

Level shifting is the process of converting between different logic levels. E.g. from 0-3.3 V logic to 0-5 V logic

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Using frequency-compensated resistive divider as digital level-shifter

We have all seen the "frequency-compensated resistive divider" circuit in, for example, 10X oscilloscope probes: simulate this circuit – Schematic created using CircuitLab Has anyone tried ...
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44 views

Level converter with noisy output

I have the following circuit setup to feed a sine wave into a microcontroller. This converts the sine wave into a square wave so I can measure the frequency. The output of the opamp (U1 - OPA4830) ...
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85 views

Levelshift distorts when freq is higher than 4kHz

I 'designed' this circuit to shift a level coming from an arduino to -5/+5v signal. It simulates well in EASYEDA. I also built it on a breadboard with a symmetrical powersupply and signalgen giving ...
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84 views

Boost converter 3.3 to 5V MAX756

I want to step up my power supply from 3.3V to 5V. For this I choose the MAX756 for his price and his availability. But I don't understand the pinouts... Pin 1 : I can leave it on fly ; Pin 2 : To ...
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67 views

12v to 3.3 v logic level shifter?

For my application I have to read 12V pulses from a optical encoder into a GPIO pin of a Raspberry Pi. What could be the best solution to convert 12v HTL signals to 3.3V for RPi GPIO input? Is a level ...
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ACS712 interfacing with MCP3208 and Raspberry Pi

I've managed to capture a voltage signal from a 10Vpp @ 50Hz source, level shifted to (0-3.3V). My ADC (MCP3208) is powered by 3.3Vcc. How can I measure the current flowing through it using ACS712 (5A)...
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76 views

Level shifter using LM324 Op Amp for ADC reading

I'm want to digitize an +/- 2.5 V signal using an ADS1256. Since the IC can't take negative voltages I designed a level shifter with a LM324 to translate the +/-2.5 V signal to 0 - 5 V but I was only ...
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63 views

which kind of design of level shifter suitable for high frequency data transfeing in range of 1MHz? [closed]

A circuit needed to convert 3.3V and 5V logical voltage. However, the issue was that the circuit was supposed to handle very high data transfer at or above 1 MHz and up to 16MHz. I thought of ...
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39 views

Need suggestion on 2 channel transceiver 5V to 3.3V level shifter

I need to Interface multivibrator output to control input of the analog switch. Where the maximum operating voltage of analog switch is 3.6V. So I need voltage level shifter from 5V to 3.3V. And the ...
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59 views

op-amp level shifter

I'm working on a brushed dc motor driver and I have to monitor the current. so I use ACHS-7121 current sensor. This sensor convert +-10A into 0V to +5V and have +2.5V in zero current. Now I want to ...
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88 views

Increase Rise and Fall Time of this Schematic

The following cirucit converts a 3.3V PWM signal into a +-12V PWM signal and works as expected. I want to increase the rise and fall time of the ouput signal to approx 2us. How can this be done? ...
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48 views

Overcurrent Protection Relay, How do I simulate it with Raspberry Pi?

I'm using RPi and MCP3208 to simulate an overcurrent relay. I managed to level shift the AC signal and now I get the voltage reading at 0-3.3V. As this is an overCURRENT relay, I was stuck for a ...
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47 views

Electrical Switch for LED’s (Providing enough MOSFET gate voltage)

I am designing a circuit to independently control (ON/OFF) up to 8 LED strips. So 8 independent channels The LEDs are of a single color (Not RGB). LED’s are also rated 12V. The controlling signal is ...
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91 views

Circuit to adjust -30V to +30V input to 0 to 3.3V for ADC? [duplicate]

Currently working on an oscilloscope design that would require each channel to be able to take in between 30VPP, -30V to +30V, which will go to an ADC which has a maximum input of 3.3V. What types of ...
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76 views

I2C Level-shifting? 2N7002DW

Can someone explain this IC? It seems to be a two-way n-mos (has two circuits in one). I have a master device that runs on 5V and multiple slaves that run at 3V3 and they communicate via i2c. Why ...
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Driving a 74HC245 in one direction with 3.3V when Vcc is 5V

I have a 5V device that accepts parallel data in. That data is buffered by a 74HC245 IC (TI datasheet, NXP datasheet) where the Dir pin is hard wired to drive in ...
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58 views

Bi- directional level shifter 1.8 - 5V <-> 3.3V

I have the following issue: I2C data from various devices with VCC/IO level from 1.8V to 5V should be handled from my controller, but this just tollerates voltages up to 3.3v on IO pins. I had a look ...
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37 views

Single chip level shifter from LVCMOS to 12 V

I'm working on a nixie clock based on a STM32L476RG microcontroller and HV5530 chips. The microcontroller uses 3.3 V logic while the HV5530 really needs 12 V logic, which is a pain to implement. There ...
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142 views

Raspberry Pi with 74HC14 connecting to LED strip (WS2812B)

This might be a stupid question, but I can't seem to figure out how to convert 3.3V to 5V with the 74HC14. I have a power source which can supply 5V (see the power adapter at the left), and use it to ...
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23 views

Adding DC shift to modulation wave

I wanted to add 12V dc shift to a modulating wave of 10Vpp amplitude and 5k frequency. Can you please suggest appropriate resistor and capacitor value to be used. Best regards
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69 views

Could a resistor work as well as a signal diode in this level-shifting circuit?

The following hackish circuit uses the internal circuitry of one "sacrificial" WS2811 LED to level up the logic voltage to 5V for the remaining strip by placing a signal diode in series with the power ...
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109 views

Why do I get constant DC 2.5V when level shifting +/- 5V to 0-3.3V (LM741 op amp)?

I'm using RPi 3b+ with ADC (MCP3208) to monitor AC signal (+/- 5V). Since the ADC can't read negative signals, I tried to level shift it using an op amp (LM741). I tried to make this connection (the ...
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69 views

How to chain I²C level shifters?

How can I chain two level shifters in a multi-master I²C system? The following picture shows the I²C bus. Due to low-voltage to the masters, the A side (low-voltage side) of the level-shifter needs ...
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45 views

Voltage Translator (SN74LVC1T45) Locking Up?

I am building a programmer for Atmel AVR devices that includes dual (5/3.3) voltage selection and an integrated FTDI chip for serial diagnostics. I'm using the TI SN74LVCxT45 series for voltage ...
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52 views

Shift 10-15v to 0-5v

I'm looking to shift 10-15v to 0-5v to read with the Analog input of an arduino. I've seen some solutions with an OpAmp but all require a negative rail which I do not have. I know I could use a ...
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56 views

Stepping Down Logic Level of a Differential Signal

simulate this circuit – Schematic created using CircuitLab Suppose I have a unipolar, differential 24V signal, and I want to step it down for use with a 5V differential receiver (such as RS-422)...
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76 views

Need help level shifting

I have an AC signal (500 - 1000Hz) 1v peak to peak that sweeps around 0v. The signal needs to be shifted to 0.5 -2V, a gain of 1.5... The power supply is +-10V. Just looking for someone to point me in ...
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448 views

How to reduce power consumption in level shifter

I need to level shift a 3.3v digital signal to 5.8v at around 1MHz. The circuit below works but the power consumption is very high. Can anyone suggest a modification which will still allow the ...
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1answer
85 views

Connection between 3v3 and 5v I2C without have a reference voltage

I've two board that must communicate trough I2C BUS. One operates at 3v3 and the other one at 5V. I unfortunately can't use a reliable level shift IC becouse the physical connector on the board share ...
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39 views

Need help with level shifting and amplifying a signal

I have a 1V pk to pk analogue signal and need to shift and amplify the voltage to 0.5-2V.The supply into the amplifier is ±10V. The frequency of the signal is 500 - 1000Hz. What sort of circuit ...
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104 views

“One way” level shifter for PWM 4PIN fan control

I'd like to make a 4 pin pwm fan control using 3v3 uC. Fan is 12v powered and I have a 12v to 3v3 converter to power uC (VCC gate is 3v3 uC power). I want to isolate 3v3 VCC and 12v as much as ...
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41 views

Voltage follower with shift

I am trying to figure out a simple application/ circuit that would allow me to shift the voltage a little bit. Lets say we have an input voltage of range from 0 to 1 V. I need an output voltage of 0.2 ...
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39 views

Significant noise observed on channels of TXB0108

We're working with a ADC chip test setup that uses the TXDB0108 to step up 1.8V data lines to 2.5V that are connected to Kintex7 FPGA. The pin-out is as follows: VCCA is 1.8V, while VCCB is on a 2....
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43 views

How to convert a +/-12 V digital signal to 0/+5 V?

What would be a simple way to convert RS-232 +/-12 V digital levels into +5/0 V respectively? I considered an optocouple, but I can't find one that can withstand -12 V reverse voltage. I considered ...
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48 views

12v Fan Control with 3v3 uC

I need to control 12v Fan with 3v3 uC. I need to stop and start it using uC gpio pins. I tried to use this schematic first: But when I set uC gpio (14 in my case) to 0, fan starts to make a weird ...
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Buffer-cum-Level shifter using dual MOSFET

I am putting together a Buffer-cum-Level shifter using dual MOSFET to deal with PWM signal for display backlight control. This 3.3V PWM signal is driven by MSP430G2452 and would be reaching the ...
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2answers
365 views

Need to map 0-5V DAC output to 0-10V output

I am using a TLV5618 to take a 16 bit SPI package to produce a voltage between 0-5V with 12 bits of resolution (4 control bits). Now I need to shift this signals from 0-5v to a 0-10v signal. I do ...
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109 views

Shifting level voltage of a signal

I have a signal, which can vary from 400 to 7000 Hz approximately. It is a kind of pwm signal and has the time of high level, Ton, 30 times longer than the time of low level, Toff. The shape of the ...
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120 views

Replace an inverter and a MOSFET with an IC for 3v3 to 5v level shifting?

First, I'll go through what I think is going on in this circuit. If I understand it correctly it's basically a logic converter. The 3v input comes from STM32 GPIO and the output goes to a floppy disc ...
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152 views

Low frequency level shifting using single supply opamp

Referring to this discussion, I want to ask whether this can be done using single supply? I have a similar problem where my input is a triangular wave swinging between 130mV and 500mV at 250Hz ...
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151 views

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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1answer
59 views

Level shifting between SD Card and Lipo-powered microcontroller

I have an ATtiny861 microcontroller powered directly from a Lipo battery. My circuit is designed to operate on supply voltages from 3V - 4.2V (bonus if it tolerates up to 4.6V). I need to interface ...
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114 views

Changing output voltage of a buck converter by electronically swapping the feedback resistors

I am going to design a circuit which is going to output some digital signals. The output stage of the circuit will have some level shifters. The level shifters will give flexibility to the user to ...
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58 views

LEDs flicker when I move my circuit

I'm building an LED driver circuit, CD4504B and TLC5916 controlled by a Raspberry Pi: simulate this circuit – Schematic created using CircuitLab I'm finding that sometimes when I move the ...
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368 views

1.8v to 3.3v level shifter logic family [closed]

I have been looking for a level shifter capable of doing 1.8v to 3.3v. For whatever reason it seems almost everyone carries 2v to 3.3v shifter but 1.8v to 3.3v are few and far between. For practical ...
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549 views

Level shifter for WS2811 led strip

I'm trying to control a WS2811 Led strip with an ESP32. I'm using a logic level shifter to convert the 3.3V output of the ESP32 to 5V. I bought this level shifter (txs0108e) https://fr.aliexpress.com/...
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219 views

How to speed up level shifter?

I have a level shifter that uses a transistor to control the gate of a high voltage P-channel MOSFET, like this: simulate this circuit – Schematic created using CircuitLab This is designed to ...
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2answers
166 views

10-30v to 3.3v Level Shifting [closed]

Could someone point me towards a level shifter IC or circuit that can handle 10-30v to 3.3v shifting? It doesn't need to be fast or bidirectional just want to data log the state of some 12v and 24v ...
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118 views

How does a LSF level-shifter work?

I'm trying to interface an Arduino with an eMMC chip to bit-bang it. eMMC uses bidirectional lines, and one of them (CMD) is first used in open-drain mode (for identifying devices on the bus) and then ...
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70 views

The simplest “adaptive” downward level shift solution?

I want to build a level shifter circuit for the RX pin of my ESP-12S. The goal is to convert any level between 3.3V and 5V to 3.3V as I might use many USB to UART breakout boards with different output ...

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