Questions tagged [level]
77 questions
47
votes
5 answers
Why are things like RESET/MCLR active low on most ICs?
Convention?
Easier to implement?
Another reason?
Is there a reason things like MCLR or RESET on microcontrollers are active-low, that is, you have to pull them down to reset the IC, and pull them up to "run" the IC.
I'm just curious because this…

Thomas O
- 31,546
- 57
- 182
- 320
44
votes
4 answers
What does edge triggered and level triggered mean?
I am studying 8085 microprocessor architecture and the terms edge triggered and level triggered confusing me really very much. Can anyone explain me it in layman's words ?
While studying the interrupts of 8085 named RST 7.5, RST 6.5, RST 5.5 and…

ATR
- 1,213
- 2
- 11
- 9
23
votes
5 answers
Why edge triggering is preferred over level triggering?
I am trying to understand why edge triggering is preferred over level triggering. In my book it is not explained clearly. After searching online I came to know that edge triggering is insensitive to glitches whereas level triggering is sensitive.…

avi
- 605
- 2
- 8
- 13
5
votes
5 answers
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 circuit clearly works when demonstrated with a…

Ptolemy
- 61
- 4
4
votes
2 answers
How to reduce an audio signal to proper input level?
I'm working with an audio ADC that supports a max audio input of 500mVRMS before it will start clipping. This is sufficient for lots of equipment that does a 1VPP/.35mVRMS line level, but I'm finding that lots of equipment like computers, and MP3…

ArraysStartAtSeven
- 907
- 2
- 8
- 9
4
votes
3 answers
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 what to do if amplifier is more powerful than that.
So…

LiskoSlayer63
- 65
- 1
- 2
- 7
3
votes
3 answers
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 use a float-switches.
This got me wondering as to…

jay
- 258
- 3
- 12
3
votes
1 answer
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\$ (\$R_1\$) and 100 \$\Omega\$ (\$R_2\$) and it…

user314164
- 85
- 8
3
votes
1 answer
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 convert it into an alternating square wave between…

Dhaval
- 41
- 2
3
votes
3 answers
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
- 175
- 5
3
votes
1 answer
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 is grounded. Why is this so?
Any information…

Ph3ng
- 337
- 1
- 9
- 20
3
votes
2 answers
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 liquid level desired in the tank. The second…

ebeygin
- 31
- 1
- 3
3
votes
1 answer
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% of the sensors we buy for them fail in the…

John Taylor
- 61
- 4
3
votes
2 answers
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 to a CD4047 (pin.3) on the second circuit. But…

Dimitri Petrucci
- 431
- 6
- 17
3
votes
1 answer
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 the sensitivity of the microphone is -44dB @…

J.Jay
- 131
- 1
- 5