Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [level-shifting]

Level shifting is the process of converting between different voltage ranges or logic levels, e.g. from [-1 - 1 V] to [0 - 3 V], or 3.3 V logic to 5 V logic.

649 questions
34
votes
9 answers

Bidirectional 5 V to 3.3 V level shifter

How do I interface 3.3 V Input/Output to 5 V Output/Input? I need it primarily for an Arduino Due but any general purpose bidirectional circuit (or IC) would work. Some people advised me to use the SN74AHC125 and CD4050 ICs, but I don't understand…
3bdalla
  • 865
  • 1
  • 12
  • 25
26
votes
2 answers

Level shifting a +/- 2.5V signal to 0 - 5V

I have a front end module that generates an (ECG) signal that varies from +/-2.5 V. I want to shift this signal to 0 - 5V. What is the best way to do this? Would a summing amplifier like the below circuit good enough? With R1 = R2 and V1 = 2.5V, V2…
govind m
  • 403
  • 1
  • 4
  • 6
9
votes
6 answers

Increasing Voltage

I have a binary signal, 0V to 1.4V, which I can't change directly. What circuitry, (on a PCB) can I use to increase 1.4V to at least 2.5V. Do I need a transistor? I guess I'm looking for a switch that will "close" when there's 1.4V? I'm a complete…
Jonathan.
  • 457
  • 3
  • 5
  • 11
5
votes
3 answers

Voltage level shifter

I need to make a voltage level shifter. It needs to translate a TTL logic level into a 12 V logic level. I have applied the 5 V at the base and 12 V Vcc and took the output from the collector (not using any emitter resistor). The output was good,…
SaM
  • 902
  • 1
  • 8
  • 13
5
votes
1 answer

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 bandwidth but bring the power consumption down? Adding…
Charlie Skilbeck
  • 427
  • 3
  • 11
5
votes
4 answers

Level shifting 5V to 3.3V - can I just use a zener diode?

simulate this circuit – Schematic created using CircuitLab My problem is the ATmega328 is running at 5V. I know I need a bidirectional level shifter. However don't really want to spend much more money on this if I can. I don't want to blow up an…
Ageis
  • 3,353
  • 14
  • 45
  • 67
3
votes
3 answers

How can I translate logic signals from 5 V to 3.3 V?

I have a range of data signals and clock signals that I want to translate down from approximately 5 V to the 3.3 V range. Is there an IC available to perform this task? The various signal frequencies are 60 Hz, 3.5 MHz, 238.6 kHz. The required…
Rob Holmes
  • 147
  • 3
3
votes
2 answers

Level shift 3 V digital signal to 5 V with fewest possible components

I'm trying to convert a digital signal which, when high, is a bit less than 3 V, to an equivalent signal where the high is 5 V. I have at my disposal the signal wire, a ground wire, and a 5 V wire. This signal runs at around 2.5 MHz. I know there…
Paul Accisano
  • 133
  • 2
3
votes
3 answers

level shifter alternatives using passives

I have always used level translators when communicating between 2 systems(or controllers) of different voltage levels. For eg txb0108 is a commonly used one, among a host of others. Now, why should one use such an ASIC. Why can the same be not done…
Board-Man
  • 1,929
  • 1
  • 27
  • 75
2
votes
3 answers

Connecting a 3.3V circuit to a 5V bus

I would like to connect a 3.3V (not 5V-tolerant) circuit (a Xilinx XC3S200 FPGA) to a TTL-level 5V asynchronous 16-bit bus (very similar to qbus) with about 30 mostly bidirectional lines. (The bus belongs to a Elektronika BK-0011 homecomputer with a…
aiju
  • 21
  • 3
2
votes
1 answer

3.3V to 5V logic converter

I'm looking to drive some NeoPixels off an 3.3V Arduino Nano. I've read that I need to use a logic shifter as the NeoPixels run off 5V. Adafruit recommends the chip 74AHCT125 but I want a surface mount chip. Would the chip SN74HCT04DRG4 be a good…
user2508385
  • 139
  • 5
2
votes
1 answer

High level logic level

I need to read a high level logic level betwwen 0 to 30 volts on a microcontroller input, is this is correct, thank you
1tact
  • 51
  • 1
  • 3
2
votes
3 answers

Level shift + amplify

Let's say I have a signal where 1v is digital 0, and 4v is digital 1. I am a little lost how can I use PNP+NPN transistor to have +11..12(for 1) or -11..12V(for 0) output, provided that I have +12/-12 PSU? UPDATE: This is for low-power MOSFET…
BarsMonster
  • 3,327
  • 5
  • 46
  • 80
2
votes
1 answer

Why would a 5V input to a 74HC04 pull it's V_CC from 3.3V to about 4V

I have the following circuit: simulate this circuit – Schematic created using CircuitLab The SN74HC00 (from TI) has input clamps, so I am expecting the 5V logic input to be clamped to about 3.3V at pins A and B, and (5-3.3)/1000 = 1.7 mA to flow…
rudolfbyker
  • 163
  • 7
2
votes
4 answers

What is the simplest op amp level shifter?

What is the simplest op amp level shifter? That is, no gain and both inverting and non inverting configurations, for AC coupling
user32885
1
2 3 4