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Using 1.8V digital signals with TPS281C100A and AP22653A

I plan to use the following two devices: AP22653A and TPS281C100A and drive the enable pin from 1.8V logic. They are specified for minimum 3V3 operation, but for both inputs the VIH is 1.5V. Would ...
Cez Chi's user avatar
  • 25
3 votes
6 answers
336 views

Water level monitoring: simplest way

I like to develop a water level monitoring for my cistern tank: empty level, low level, mid level, high level. One of my booster pumps broke because it runs even when there is no water in the cistern ...
Carlo S's user avatar
  • 31
1 vote
2 answers
104 views

Level shifter controlled by external voltage (VL,VH)

I used a MOSFET to design a level shifter, but it must be adjusted according to this value by receiving an external power source. For example, if VL = 1V and VH = 4V, the output should be between 1V ...
aAa's user avatar
  • 11
0 votes
1 answer
209 views

Parallel resistor in line-level output

I have a mono line-level output and I want to share it with two devices which will receive the line level output and use it. In one of those devices I need to use a 10 kΩ potentiometer in order to ...
amandanovaes's user avatar
0 votes
1 answer
255 views

What is a feasible way to measure water level in a pool skimmer?

I need to implement a wireless autofill system for a pool. The skimmer is the only place that I can install the sensor (nine inches in diameter, made of ABS). When the pool is full it is 2" from ...
RDocG's user avatar
  • 13
1 vote
0 answers
69 views

adding a low fuel light

im wanting to add a low fuel level light to my car. it has a fuel gauge, 33 ohms full 270 ohms empty. the tank has two terminals, one to the body for ground and one directly into the back of the gauge....
smyffe96's user avatar
0 votes
0 answers
176 views

How to do a pulse generator whose pulse width is controlled by a voltage measured in proteus without using a microcontroller or an analog circuit?

how are you?. I'm trying to emulate the behavior of the HC-SR04 distance sensor in proteus but using variables. I succesfully could make a simulation of a water tank whose level is indicating by the ...
vram's user avatar
  • 158
0 votes
4 answers
935 views

Confusion about edge/level triggering interrupt

I have read this answer. My understanding is, there are actually 2 lines logically: clock/gating line event/interrupt line And the clock/gating line can make the circuit take event input at an ...
smwikipedia's user avatar
  • 1,192
1 vote
2 answers
1k views

Are those electric fields dangerous?

Is 8.6 amperes per meter, 70 microtesla, 0.70 gauss, 695 milligauss, safe on long time exposure? I am just worried.
Paul Delaunay's user avatar
1 vote
1 answer
60 views

Control R channel volume from L channel

I have a mono line level (signal and GND) and I want to create L and R channel from it (to output sound to 2 separate speaker) BUT I want to be able to control the volume of the R channel.   Creating ...
user314164's user avatar
3 votes
1 answer
437 views

Get resistor values for voltage divider/attenuator

I have a 10 V audio source that I want to bring to line level: 1 V. That's pretty easy: I just need to use a voltage attenuator, 10:1, like in the image below. I used resistor values of 1 k\$\Omega\$ (...
user314164's user avatar
0 votes
3 answers
256 views

Using the same power supply produces no sound [closed]

AS SOME OF YOU ASKED, here is the video showing the connection and the problem: https://photos.app.goo.gl/GRsxQ783Rec6jVxo6 One clue that I got today: the problem happens EVEN if I disconnect the ...
user314164's user avatar
3 votes
1 answer
455 views

Water level indicator LED lights up even though circuit is open

I have built a water level indicator with a 555 timer. The supply is a 12 V SMPS adapter, the output of 555 timer is a square wave with a 21 kHz frequency. I pass this signal into AC coupling to ...
Dhaval's user avatar
  • 41
0 votes
1 answer
325 views

Humming sound when not touching wire

I explained this problem in a video so you can see with your own eyes the problem... touching the GND wire makes the problem go away, however touching the signal wire creates the problem. Even ...
user314164's user avatar
0 votes
2 answers
971 views

Convert speaker level to microphone level

I have a digital piano without line output (not even earphone output) but I would like to record what I am playing. So I decided to convert the speaker level to mic level so I can record the audio in ...
user314164's user avatar
2 votes
2 answers
2k views

Line level to microphone level to record

I have a digital piano with an earphone output where I can connect a simple earphone (like in the picture below.) It works fine. I would like to connect this earphone output to my smartphone jack (...
user314164's user avatar
0 votes
3 answers
1k views

Voltage divider from speaker to line level generates noise/huming

I have a really old device and I can only access the speaker wires of it. I want to setup a line level from the speaker so I can connect it to another device. I used a very simple voltage divider (2 ...
user314164's user avatar
0 votes
2 answers
398 views

Water level indicator using transistors

I'm trying to designing a water level indicator using npn transistor(BC548). I tried simulating the circuit on PSpice, but I don't know what to add for the sensor. I want a graph. The circuit will ...
Saf's user avatar
  • 1
0 votes
1 answer
78 views

How to score glass to shine straight horizontal laser line through [closed]

I’m trying to make a DIY laser level, I took apart a cheap one to see how to shape a laser spot into straight lines, it turns out that a simple laser beam passes through a small piece of glass (or ...
ThePolarCat's user avatar
0 votes
1 answer
278 views

The reason behind LEDS getting dim (Water level indicator using ULN 2003) [closed]

** Whenever I switch on the circuit, the LEDs glow fully for a second and gets off. After 2-3 seconds they start glowing slowly. What might be the reason for the above?
Rafi Md.'s user avatar
2 votes
1 answer
198 views

Picking a FET for Logic Level

I've always been confused when picking a FET to be used for logic level signals. There are so many factors to look at for FETs, I get overwhelmed. In this case my supply voltage will be a 3 alkaline ...
Pete's user avatar
  • 155
-1 votes
1 answer
2k views

What are the voltage levels in 100 Base-TX Ethernet?

I know what the differential voltage looks like. If you measure across Tx+ and Tx- it goes from -1V to 0V to 1V and so on, but how are these voltage levels actually transmitted? Does Tx+ go from 0V - ...
VicTic's user avatar
  • 61
3 votes
3 answers
2k views

Simplest way to check if an audio level is line or micro?

I can check level audio on a VU Meter or dBFS meter. What's the simplest way to check if an input audio level is line or micro? Can I use a multimeter?
ark1974's user avatar
  • 175
0 votes
1 answer
156 views

lowering output level of a phono preamp

I built a RIAA phono preamp that works great from these schematics: But the output level seems a bit too high. What would be the best way to lower it?
brunobhr's user avatar
  • 140
2 votes
0 answers
706 views

Sound level meter using a microphone with ADC

I'm working with STM32F4, MAX4466 amplifier and a condenser microphone. In other words, Adafruit 1063. I want to get the sound level in dB unit. I know: Microphone sensitivity: 0.0063096 V/Pa ...
sabruri1's user avatar
0 votes
0 answers
179 views

Level sensor Transmitter

I have a level sensor and transmitter(4-20mA standard) of Qidian Automation for sensing level of liquid in tank having capacity of 1000 litres. On transmitter it is displayed 0.516 when tank is half ...
Jashanjot Kaur's user avatar
2 votes
0 answers
71 views

Strange levels on UART TX

I am trying to get the boot chatter from a UART on IOT device. When powered up TX line goes high as expected (3.3V), but when it starts "talking" - scope shows that hi/lo levels swings are ...
user41224's user avatar
1 vote
2 answers
3k views

How to control one motor with two float switches

I have 2 tanks , one is under another and hopes to pump from under tank to upper one using a 0.5 Hp single phase motor.By connecting float switches for both tank,can I control the motor to turn on ...
Charit Udyounger's user avatar
1 vote
1 answer
327 views

Audio line level conversion from consumer to unbalanced (presumably) pro 1/4" jack of unknown sensitivity and impedance. 400W 1980s PA amp

I have a lovely pair of speakers that achieve their almost flat response by dampening spikes. Consequently they eat amp power for breakfast. I have been given a 400W RMS per channel 19" rack mount ...
Rinderpest's user avatar
1 vote
1 answer
110 views

Need help in understanding the working of battery level indicator

I have got hold of a battery level indicator on net. I works but I am not able to understand how it is functioning. I am new to electronics and I just dont want to build a circuit from a diagram. I ...
EleticalAmit's user avatar
0 votes
3 answers
215 views

Water level sensor. How to read it?

I have a water level sensor in which by varying the level of the water, an inductance change his value in a mobile coil. The sensor have the internal simple schematic like this (i don't know the value ...
daigs's user avatar
  • 83
2 votes
2 answers
2k views

RS485 transceiver supplied with 3.3V. What voltages can I receive?

I'm designing a print for RS485 with the LTC2854 transceiver, but I don't know in what exact situation it will be placed in. So I don't know what voltage levels the other devices will communicate on. ...
ehrickk's user avatar
  • 21
1 vote
2 answers
1k 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. ...
Vincent's user avatar
  • 69
0 votes
1 answer
393 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 ...
Joe's user avatar
  • 183
3 votes
1 answer
694 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 ...
Ph3ng's user avatar
  • 347
3 votes
2 answers
4k 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 ...
ebeygin's user avatar
  • 31
0 votes
1 answer
758 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 ...
Suhail Jr.'s user avatar
1 vote
3 answers
540 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 ...
Jay Vadoliya's user avatar
0 votes
2 answers
355 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 ...
Eric D's user avatar
  • 3
2 votes
1 answer
2k 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 ...
user1258202's user avatar
1 vote
2 answers
1k 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 ...
pr2h's user avatar
  • 11
3 votes
1 answer
164 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% ...
John Taylor's user avatar
1 vote
2 answers
162 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 ...
MattyT2017's user avatar
2 votes
1 answer
985 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)....
Hendriks3D's user avatar
5 votes
5 answers
1k 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 ...
Ptolemy's user avatar
  • 61
1 vote
2 answers
1k 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 ...
Gerbe's user avatar
  • 11
2 votes
0 answers
71 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 ...
user1824971's user avatar
1 vote
1 answer
2k 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-...
daniels_pa's user avatar
0 votes
1 answer
931 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 ...
user avatar
0 votes
2 answers
130 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 ...
CarolusM's user avatar