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0 votes
0 answers
20 views

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
334 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
254 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
933 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
435 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
969 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

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