Questions tagged [small-electronics]

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45 views

Energy-efficient method to fit a 7-segment display + computing, into a tight space? [on hold]

Note: there's a 50/50 dis/agreement about this sort of thing on Meta (see here), so I'm hedging my bets that this will be allowed. I'm currently working on designing a device that has to be ...
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0answers
62 views

Save power to supply circuit for a short time (Capacitor? MOFSET?) [on hold]

I have a really simple circuit that make a Contactor that charge by a relay when relay change its direction, current flow interrupt for a really tiny time and I what to keep Contactor charged during ...
1
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1answer
52 views

Switch placement on electronic circuits on the positive wire

Why are main on/off switches in electronic circuits/appliances (any small, low power electronics) always placed on the positive wire (in case of DC circuits) between the power supply (batteries, ...
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2answers
1k views

Single pulse when circuit is powered on [closed]

I am new to electronics and I am wondering how can I use my Vcc to produce a short single pulse.
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1answer
79 views

Calculate resistance of an unknown resistor in a circuit

I am currently studying some old exams for the upcoming one and I got stuck on this question, I seem to get the right answer by eyeballing the circuit but I want to be able to calculate the value. ...
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2answers
103 views

How to convert 0-3 V (PWM range) to 0-24 V (device voltage requirement)

I have an Arduino with some PWM pins, output range is 0 to about 3 V and I need 0 to 24 V range. I need to active a solenoid - a hydraulic proportional solenoid A 12V and 5V source is also ...
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0answers
53 views

Is diode reverse recovery time related to diode capacitance?

The title. Is there some relationship between the two parameters? For example, fast diode recovery time indicates low capacitance, or even farther, can one be calculated from the other? Thank you in ...
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1answer
63 views

Can I use 13003 transistor in place of 2n2222?

I am working on a project which requires a npn 2n2222a transistor as recommandation. But as of now the transistor is not available to me. Alternatively I have transistor 13003 and c945 available as ...
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0answers
40 views

Choosing clock buffering circuit

The modular 5V-powered design's module is having two output clocks (21 MHz and 3.5 MHz) to other modules in the system. I am looking for the best way for buffering these signals so that they would be ...
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1answer
41 views

SPI pins logic level issue [closed]

I have ESP32 and the popular dot matrix module MAX7219 8*8 module to interface. It is connected through SPI pins. After a sample word printing on the maxtix it shows garbage outputs. Is it happening ...
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0answers
37 views

Difference between cutoff and subthreshold region of nmosfet?

I understand that some current does flow from drain to source when Vgs is below vth and Vds is greater than zero. But why this has a different name?(and a different region in Cadence virtuoso tool) ...
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0answers
35 views

Low power, low profile binary indicator

I am looking to find a way to communicate an alarm on a tiny device with a very low profile low power consumption component. The alarm is binary in nature, basically it is either on or off. LED does ...
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5answers
1k views

Does anyone have problems with micro USB connectors on PCB?

In a PCB I've been developing, I included a micro USB connector. The problem is that when I plug in and out cables on it, seems to get weaker and weaker and needs to be resoldered, even the pins on ...
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1answer
57 views

Can the FTDI Tx and Rx tension level be different that it's VCC?

I'm building my own FT232RL to convert a UART signal to USB. The source of power will be the USB 5V, but for reasons of the circuit i already have it would be easier to let more of the circuit keep ...
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0answers
45 views

Is it possible to measure impact force using Flexible PVDF Piezoelectric Film?

If it is possible , should i use integrator circuit first to hold the signal then follow it by other signal processing signals (amplification and noise filtering ) ? , knowing that i tried to connect ...
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1answer
75 views

Where do I start to look for an automatic off feature on a circuit? (Guidance) [closed]

My child has a light up toy that turns off after 20 minutes and she likes it all night when she’s sleeping. I’m trying to figure out where to start looking among the circuit for the automatic off ...
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0answers
51 views

Unable to find data sheet for MAX8918ITM

I am quite new to electronics, so I apologise for the inevitable mass of stupidity in this question. I am trying to find the data sheet for the LCD driver MAX8918ITM, from a Nikon COOLPIX L110, and it ...
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1answer
57 views

Common ground for different voltages

I see there are a number of questions regarding this but none made it clear to me, so I'll risk being virtually stoned and go ahead and ask it again. I have a 12V battery which powers some 12V ...
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0answers
44 views

What can i do with a WM8192EU USB module?

I recently came across a wm-8192eu usb module from an old electronic doorbell. It had a socket on the board that it just slid right out of. When i googled the chip it showed a bunch of usb wifi ...
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0answers
112 views

Shift square wave down for electromagnet as load

I generate a rectangular wave (from an NE555) with a frequency which can be as low as 0.25 Hz. The rails are 0V and +10v. The output signal after a 33uF capacitor swings between 0V and 5V and is ...
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3answers
91 views

3mm and 5mm LED

Why can't we use a 5mm LED as the flasher in this circuit? What's the difference between a 3 mm and 5 mm led? How do you identify one?
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1answer
54 views

What will be the effect of changing the order of the filters on the sound coming from each speaker in my audio system?

What will be the effect of changing the order of the cross over filters on the sound coming from each speaker in my audio system?
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1answer
35 views

Problem with PSPICE simulation

I am having a problem replicating some lab results in the PSPICE/capture CIS program for an assignment. I have this circuit right here: which is an oscillator using the uA741 op-amp which is supposed ...
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1answer
32 views

Problems with capture cis simulation

I am trying to run some simulations on capture(PSPICE) for a school assignment and then compare the results of them with the results that i got when trying these circuits in the lab. However the ...
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1answer
71 views

Limitations of sound card oscilloscope

I’m supposed to build a buffer circuit for pc oscilloscope using the sound card of the pc and a software “zelscope”; however there’re limitations: Not possible to display DC because there’s a DC ...
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3answers
69 views

Flat line on output of single supply sawtooth generator

I have built the following sawtooth generator using LM358 opamps: In simulation everything works fine, however in reality I get only flat line on output. Anyone got any idea what's going on?
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1answer
64 views

Compensated vs uncompensated Op Amps [closed]

What are the advantages/disadvantages of compensated and uncompensated op amps? Thank you in advance.
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1answer
80 views

AD5933 is not working with external clock

I am using AD5933 impedance measurement chip. There is an option to connect an external clock. I am using a function generator to give 250 kHz, 2-volts peak square wave signal to MCLK pin, but it's ...
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0answers
94 views

What is maximum symmetrical output voltage swing in this case?

I'm pretty new to Electronics and hence the following doubt. I could not understand how the authors reasoned out the swing limits for this problem ((b)-part only)
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1answer
93 views

How do I design my own FFC cable

I need to design a custom FFC cable for an electronic device (about 10cm and 34pins) I messaged a manufacturer who could make custom ffc but he needs a layout or something and I don't have experience ...
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3answers
116 views

Is it possible to wire car speakers straight to a 3.55 mm jack? [closed]

Is it possible to re-wire car speakers (model JBL GT7-5) to a headphone jack (3,55 mm stereo plug) directly without an amp? And if not, what do I need to-do? This what I know about the speakers: ...
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6answers
1k views

Operational amplifier basics

In closed loop (negative feedback) configuration of a OP AMP the input voltages are same that means the differential voltage is zero Vd=(V1-V2)=0 ,then how we obtain the gain? where the output is come ...
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1answer
137 views

How MCU pin reads whether it is being pulled up or pulled down?

I am a beginner in electronics. I searched on the web about Pull up and Pull down concepts. As far as I know, 1) When an MCU pin is pulled up, a small amount of current pass through the pull-up ...
1
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1answer
46 views

Can I leave it unconnected pins in the level shifter?

My concern is that pins are connected between DB25 and TXS0108E, but are not connected between TXS0108E and the Header 5x2. There is only the tracks between TXS0108 and the Header 5x2, but there is no ...
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1answer
78 views

Both sides of a voltage level shifter connected

The TXS 0108E is a level shifter circuit, performing, in my project, a shift level voltage from 3.3V to 5V . Because of a design error in the wiring diagram, I left some pins with the same name on the ...
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4answers
2k views

Indicator light circuit

I'm an electrician and my work is to maintain boats. I have a problem. On the boats are sailing lights, and for each sailing light is another light inside the boat that tells you if the sailing ...
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2answers
43 views

Can I connect a 15A surge protector to a 13A extension cord?

As someone who’s studied engineering, I should be able to answer this question. However, a quick search online has me confused. Provided what I’m plugging in (a laptop drawing relatively little power)...
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1answer
72 views

Avrisp mkii not recognizing atmega 328p chips

I have three different sets of chips, the attiny85, 328p, 328p-au. Initially, the avrisp mkii, was programming the atmega328p, however now it is not recognizing this chip (i.e. 328p) or the 328p-au. ...
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1answer
106 views

How do I stop signal looping with I/O port in this communication system

I am still a student. When I am designing communication system I am facing this problem: As shown in the figure I need to communicate with Master and Slave. But Master and Slave have single I/O port ...
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1answer
100 views

Would these traces cause a short?

I recently designed a circuit board, but now I'm looking and I believe that once the diode and capacitor are connected, they might be shorted. Thank you for your feedback.
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1answer
44 views

ibeo lidar 4L setup

I am having difficulties in finding information regarding ibeo lidar sensor power connection. Lidar has 3 inputs/outputs one is Ethernet, CAN and power terminal. As CAN only needs 4 pins (high out, ...
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3answers
87 views

Operational Amplifiers

I was going through a problem on inverting Amplifiers and got the output voltage of the op amp as -10V. Can someone explain how the load current flows upwards from a grounded terminal? I know the ...
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3answers
2k views

Does anybody know what this IC is?

I tried different search keywords combinations, but I couldn’t find a datasheet, nor a hint of what this IC could be. Maybe someone who’s familiar with it could give me a clue. The IC is on a board ...
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1answer
134 views

I'm having trouble understanding the properties of this circuit

The objective of this question is find beta, which is ( Ic/Ib) The 3V is supposed to be 2.3V The 27 k ohm is supposed to be 20k The 230 ohm is supposed to be 230 ohm I first found Ib = 4.3 v- 2.3v /...
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1answer
60 views

240V to 110V using a Step-Down Transformer

I was wondering if there is anything I need to be concerned about in regards to using a step-down transformer to power my Weller WES51 soldering iron which is rated at 110V in the UK (mains is 240V in ...
0
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1answer
113 views

555 Timer Giving Unexpected Output (Astable Multivibrator)

I am using this design with the only exception that C2 is 150nF to change timing slightly. When I plug in the circuit and attach an LED across GND and pin 3 output the LED is static on. However, on ...
0
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3answers
131 views

What enables the home appliances and electronics to work on single-phase?

Talking about the home appliances and electronics, if it is single phase that we are using in houses and currents get to zero every half cycle, how do the home appliances (using AC) and electronics (...
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1answer
56 views

Impedance matching between CSR8675 and a MM20 microphone

I'm building my own (rugged) headphone. I am planning to use a MM20-33639-000 microphone with CSR8675 DSP. My question here relates to impedance matching. Based on what I have read, most modern ...
5
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1answer
139 views

How the PCB-A are designed?

I don't know if the question is straightforward. I am not interested in the manufacturing process, soldering, testing, etc. When I am working on a school project, first of all I try my design on a ...
31
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9answers
14k views

Does wire color matter in electronics?

I'm fairly new to electronics here. But I can't seem to find any clear answer anywhere on the internet. Are wires special depending on their color? Or they have all the same purpose with just colors ...