Questions tagged [level]
The level tag has no usage guidance.
57
questions
0
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2answers
70 views
Colpitts / Clapp oscillator crystal drive level
simulate this circuit – Schematic created using CircuitLab
As I understand this circuit has some initial gain at startup, then as the oscillation builds up gain goes to unity at some moment. ...
0
votes
1answer
59 views
FT232R TTL Logic Levels
I have an FT232R chip hooked up to my oscilloscope with the TX and RX pins joined. I'm sending characters directly to it via Putty. The logic levels I am seeing are 5V low and 0V high. I thought the ...
2
votes
1answer
48 views
Why do we ground the common probe on a 3 probe liquid level sensor?
I have a liquid level sensor with 3 probes, one us common, the other is for low level and the third is for high level. On the liquid level control relay diagram, I've noticed that the common probe ...
-1
votes
1answer
51 views
Level Matching Circuit
Somebody know what do this circuit exactly or how it works ?
Where VDD = 5V (MCU) and VDD_1V8 = 1V8
It is a recommended circuit to use uart communication when the voltage level are not the same, I ...
3
votes
2answers
251 views
What is the common name for this seal-in relay?
I'm trying to build a hysteresis water pump system with 2 water level switches. Please see the diagram and explanation of this setup I've taken off the web:
The first switch (L) is set at the minimum ...
0
votes
1answer
90 views
How to make a battery level indicator for arduino (The battery is powering the arduino also) [duplicate]
Hi I am building a pocket altitude, temperature and humidity meter with 1.8" TFT display. I have a 1000mah 3.3v Li-ion battery to power the whole system. I also need to display the battery level in ...
1
vote
3answers
124 views
Sensor For Continuous Water Level Measurement
I am designing water level controller for water tank and want to show the water level in LED bar Graph
I know how to transmit data to MCU and show level to LED bar graph but my problem is to find ...
0
votes
2answers
94 views
4-Channel Level Converter outputs voltage when it shouldn't?
I am converting 5V to 3.3V (for a rudimentary Raspberry Pi project). The level converter scenario below behaves as I would expect:
Because HV1 is connected to 5V, the voltmeter connected to LV1 and ...
1
vote
1answer
185 views
PCM5102A: analog output level not what I expected?
I cannot achieve a 2.1 Vrms mentioned in their datasheet (pages 4 and 9). I can only output 1.04Vrms from the 1kHz source. Do I measure it wrong or this is what I should expect? Or maybe I get such ...
1
vote
2answers
261 views
Tank Water Level Indicator Wire
I am building a simple water level indicator (approx like the circuit below) for my tank.
However, I am wondering about the wiring, for I suppose copper cables corrode in water and produce toxic ...
2
votes
1answer
76 views
Point Water Level sensor
The company I work for uses conductive point-level water sensors to determine water level in a small tank. The manufacturer of these sensors has proven to have very unreliable quality control and ~30% ...
0
votes
1answer
42 views
Automatic level shifting
I have a signal which can have a different offset voltage based on the requirements. However, I need the voltage to start at zero.
Since the offset is variable, I was hoping if there are any ...
0
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0answers
41 views
Is using a capacitor to transfer a 0.1 V differential between voltage levels reasonable?
The temperature of a terminal at -600 V and 500 deg C needs to be measured. I am using a thermocouple for this, and to achieve the most accurate reading the couple must be physically connected to the -...
1
vote
2answers
63 views
sn74lvc1t45 pullup on the DIR line
The part sn74lvc1t45 we are sing as an SPI translator.
We usually use B -> A which means DIR goes to ground, however in a new design we are reversing this, and as a result, as per the DS it (being ...
1
vote
1answer
234 views
Can anybody help me modifying a reverb circuit on a guitar amp to an FX loop circuit?
I have a solid state guitar amplifier with a reverb tank. I have done a bit of research as to how these work. I now want to replace the reverb tank with an FX loop for normal pedals (instrument level)....
1
vote
1answer
154 views
How does this circuit works ? Usart level shift
I'd like to ask how does this circuit works:
I understand how it works in principle, but not technically. It's a USART voltage level shifter. It's supposed to divide 5V to 3.3V by a resistor divider, ...
5
votes
4answers
641 views
Will this water level indicator circuit work for my project?
I have only rudimentary knowledge of electronics so I ask for your forbearance.
There are many water level indicator circuits, of the type shown below, listed online and demonstrated on YouTube.
The ...
1
vote
2answers
459 views
Selecting a logic level MOSFET compatible with 3.7V power source
Continuation of prior question: Logic level mosfet to switch on 3.7v battery
I am a 'mature' entrepeneur Arduino level electronics noob, apologies. Want to build a flashing alert using 3W LEDs in ...
2
votes
0answers
63 views
Need a simple buzzer/LED circuit for espresso machine [duplicate]
I have an espresso machine that I tore down, reassembled with fewer components then modified it to fit a specific setup -- kind of DIY project.
The machine has an autofill circuit. After I removed ...
1
vote
0answers
307 views
RS-232 Level Shifter
Most PCs don't have RS232 built-in anymore. So the only option is USB-2-RS232 adapters or RS232 PCI-E card. While I expected the adapters to output a low voltage it turns out most RS232 PCI-E card ...
0
votes
1answer
90 views
Level Conversion RGB LED Strip Noise Resistor (3.3 to 5)
I recently prototyped my circuit on a breadboard that controls a WS2812b RGB LED Strip.
The PDIP (breadboard friendly) ATMEGA644 uses 5V logic while TQFP uses 3.3V logic.
The LED strip specifies a ...
1
vote
1answer
948 views
Water level indicator with PNP transistor
I wanted to create a circuit that Lit's up an LED when water level rises to a certain level.
I have created the following schematics following the https://www.electronicshub.org/water-level-alarm-...
0
votes
1answer
340 views
Capacitor in RS232 level shifter. Data is strictly half-duplex
I have created a level shifter very similar to the schematic at: http://picprojects.org.uk/projects/simpleSIO/ssio.htm except for the capacitor I use 47nF because the page claims:
at high bit rates ...
0
votes
2answers
80 views
I2C Level Converter
I have an Intel Edison communicating with a Olimexino-85S by i2c. The Intel Edison works with 1.8V levels while Olimexino does it whit 5V levels. I am using a Level Converter with pull-up resistors in ...
1
vote
0answers
203 views
CP2108 with level converter txb0108 - UART communication TTL and LVTTL
My project uses four different modems (one 3v3 LVTTL(?) and three 5v TTL) for AT communication.
Each modem has a UART interface (TTL compatible).
For my application, i chose the CP2108 to ...
1
vote
2answers
1k views
Negative level shifter
I need to connect two circuits that use different PSU voltages.
The first is a microcontroller clock generator, it outputs a clock 0V to 3.3V at 150KHz as maximum freq.
I need to connect this clock ...
0
votes
0answers
2k views
Basic insulation level for a 22 kV system
In the lab we tested a surge arrestor bracket for a 22 kV system with a 1.2/50 impulse. It was found that U10 for the bracket is 102 kV. I found this table for IEC standard of a 22 kV system
I read ...
2
votes
2answers
874 views
Level shifter to convert dc voltage
Can anyone help me to design a circuit which outputs 0v dc when the input is 2.6v dc and 5v dc when the input is 5v dc?
0
votes
1answer
2k views
transistor negative edge-triggered detector
This is a circuit I whipped up for an attempt to make a negative-edge triggered detector with inverted output.
The logic needs to be the following:
If input is high, output is high.
If input goes ...
0
votes
1answer
617 views
turn level-based input to edge-triggered input [duplicate]
I'm trying to figure out with the most minimal part count how to convert an input of a digital IC to an edge-triggered input.
I am using the 82C55 IC and the input on it I want to make negative edge-...
0
votes
1answer
109 views
can contactor, water level sensor and heater all live in parallel on the same circuit
I want to connect my 3000w (220v) water heating element to a 220v water level sensor Automático de Nível so that the heating element won't turn on when there is no water present.
But the level sensor ...
1
vote
1answer
63 views
Continous liquid level measurement loop connection device
I have 4-20mA loop device for measuring liquid levels. It was working well until I connected a motor (heavy load) to the same outlet(120Vac). I have this device ON and as soon as motor turns ON the ...
0
votes
1answer
115 views
Voltage difference between two individual voltage sources
I have two voltage sources. The first one is 230VAC to 5VDC cell phone battery charger while the another is output from Raspberry Pi's Ground and 3V3 pins.
I feed the 5VDC output for an Arduino. What ...
2
votes
1answer
2k views
Calculating SPL from voltage output of a microphone with MAX4466 amplifier
I'm using Electret Microphone Amplifier - MAX4466 with Adjustable Gain and I'm getting the output voltage ranging from 1.5V to 3V (which, to my knowledge, is already amplified by MAX4466). I know that ...
0
votes
2answers
839 views
Convert TTL levels to RS232 of FTDI USB<->Serial
Have this small interface FTDI FT232RL to connect a Serial device to the computer via USB.
It has been working well for most of my Serial applications, except today when I tried to use it for a ...
1
vote
1answer
2k views
Logic level P-channel Mosfet switch
I need to switch a load with a 3.3 volts logic level (pic microcontroller) is this design is correct?
1
vote
1answer
897 views
How to Shift the DC Level of Positive-going Op Amp Input Signal into the Negative Supply Region
I have a 1Vpp 1Hz repetitive arbitrary wave signal that resides entirely above the DC line. IOW there is no negative-going excursion. This is output from an LM358 inverting op amp buffer powered ...
0
votes
1answer
337 views
Logic Level Conversion. Different Voltages on High Side
I've used this circuit before to do logic level conversion. The diagram is labeled to reflect I2C however I am using it for UART.
Usually my scenarios have been where the low side is 3.3v and the ...
1
vote
5answers
22k views
how to convert UART voltage from 5v to 3.3v? [duplicate]
I have PIC18F4455 connected to spark core wifi chip. I send data from PIC18F4455 to the spark core by using UART. The problem is the output data of pic18f4455 equals to 5v, and the spark core accepts ...
0
votes
2answers
47 views
Level Adjustment Component
I am developing simple project of water level alert when water reaches to a certain level (adjusted by user) in inches.
Which electronic component i should use where user can adjust inches?
Like 5, ...
1
vote
1answer
2k views
liquid level switch and solenoid valve circuit
I am trying to make sure that I have this circuit hooked up right before I actually put it to use. I’m planning to use the liquid level switch (McMaster PN:50195K93) to open the solenoid valve (...
1
vote
0answers
67 views
Should I drive control lines of an IC at voltages higher than VCC
I am designing a circuit that will be running from a single cell LiPo battery. The battery will provide the input voltage to a boost converter that will output 5V, which will power a microcontroller.
...
0
votes
1answer
376 views
Level-triggered mono-stable multi-vibrator running at 12+ volts.
I need a CMOS (preferably dual) level-triggered mono-stable multi-vibrator that runs at least 12V (better at 15~18VDC), perhaps in the CD4000 family. Everything I have found is edge-triggered only or ...
2
votes
1answer
1k views
Clearing/acknowledging of level triggered interrupts
I am confused with the clearing/acknowledgement of level triggered interrupts in an SoC. When an interrupt is level triggered should the clearing be done in the interrupt controller or the bus ...
0
votes
2answers
2k views
Does the VU meter on audio amplifiers measure the input or output level?
Does the VU meter on commercial audio amplifiers measure the level of the input signal or the level of the amplified signal?
1
vote
3answers
276 views
How one uses level sensor?
I have bought a level sensor. I cannot find any documentation except this on the linked page. How do I use it with Arduino or anything else?
4
votes
3answers
4k views
Speaker level to line level
I want to reduce my amplifier output to line-level.
I found this tutorial, Connecting speaker signals to line level inputs, which is compatible with 50 W output power. There is also mentioned ...
2
votes
3answers
1k views
Level shift 4v peak to peak to 0 - 3.3V
I need to convert a 4v peak to peak signal (-2v to +2v) into a 0 to 3.3V signal to get it into my ADC on LPC 11u24. I have tried several designs but the problem is that all of the designs I found are ...
2
votes
3answers
4k views
Electrical conductivity to determine reservoir water level to switch on/off pump
Did a survey of the commercial products available in the local market, which are broadly classified as 'Automatic Water Level Controller' or 'Automatic Pump Controllers', and found that all of them ...
0
votes
1answer
842 views
Bidirectional level shifter circuit problem
Ok, so here is my problem:
I am trying to create a small 3.3V to 5V signal level shifter, using a BSS138 transistor.
This is my source for the circuit: a SparkFun circuit.
This is my circuit:
As ...
