Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [small-electronics]

The tag has no usage guidance.

-1
votes
0answers
36 views

Need help on a DIY project [on hold]

I have extracted the microphone circuit from my earphones. I want to be able read frequency values and all from the output of the microphone using an Arduino. How do I do that?
-1
votes
0answers
39 views

Black lines on laptop appear even laptop is switched off? [on hold]

This definitely doesn't make sense, but the persistent black horizontal lines on my laptop appear even when my laptop is switched off. The normal Color of laptop screen when switched off is a bit ...
0
votes
0answers
22 views

Small power supply for nixie tube from 3.7V battery

I would like to build a nixie watch like this one I presume that this kind of watch is powered by a lipo 3.7V battery. Do you have any suggestions on how to build a step-up converter in such a small ...
0
votes
1answer
33 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 ...
1
vote
0answers
33 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)
0
votes
1answer
42 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 ...
-2
votes
3answers
103 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: ...
0
votes
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 ...
-3
votes
1answer
114 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
vote
1answer
33 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 ...
0
votes
1answer
66 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 ...
6
votes
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 ...
1
vote
2answers
33 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)...
0
votes
1answer
44 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. ...
0
votes
1answer
90 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 ...
1
vote
1answer
89 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.
0
votes
1answer
36 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, ...
1
vote
3answers
86 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 ...
1
vote
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 ...
0
votes
1answer
86 views

Current sensor connected with fan regulator

Circuit diagram is shown. Input of FAN is connected to current sensor through a regulator My question is: Is it ok to measure AC current through this sensing IC (ACS712) when fan speed changes?
-3
votes
1answer
131 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 /...
0
votes
1answer
56 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
votes
1answer
89 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
votes
3answers
115 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 (...
0
votes
1answer
39 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
votes
1answer
135 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 ...
32
votes
9answers
12k 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 ...
0
votes
1answer
469 views

Beginner Question - Solder won't stick to a certain wire

I am trying to tin some wires as they won't stick to the IC pins that I'm soldering them to. The problem I am having is that the solder won't stick to the wire. My iron is fine as can solder other ...
0
votes
1answer
37 views

Common Collector Amplifier and its name

Why is Common Collector amplifier is also known as Emitter Follower?
1
vote
3answers
161 views

Learning electronics [closed]

I am perplexed about learning electronics. I have basic understanding of components such as inductors, capacitors, etc. But I don't know how to proceed further in field of electronics. *Please suggest ...
1
vote
0answers
43 views

Help required to design a suitable energy harvester for TENG

So I am in the process of desgining a scalable Triboelectric Nanogenerator(TENG) through which I can easily harvest and store electricity in a battery or a capacitor. A TENG can be modelled as voltage ...
5
votes
0answers
81 views

Contact a very small area (impedance matched)

In my current project, I want to apply a voltage to a capacitor (top electrode on a thin film heterostructure) very rapidly. Since capacitors have their own charging rate \$(\tau = R \cdot t = R \cdot ...
0
votes
2answers
156 views

Name of an electronic component

Can anybody kindly tell me what this electronic component in the picture is called? I've seen this component in: Mobile phone circuit WiMax modem circuit GSM Module circuit I tried but was unable ...
0
votes
1answer
85 views

finding small R in series RLC circuit

Hello! I have an device which is equivalent circuit is RC as follows in the image I shared: R is supposed to be 0.5Ω and C supposed to be 30nF, but it can vary a little bit between device to device. ...
0
votes
1answer
51 views

Sockets for T1 3v led?

This is more a 'presentation' and 'usablity' question. Is it possible to get an array type socket, prewired and capable of accepting several small (T1 or T1-3/4) led? Ideally, I am looking to ...
0
votes
2answers
90 views

OpAmp Comparator Circuit Design for High/Low voltage measurement

I am new to this. I want to make a circuit to measure the voltage from (0 ~12 V), which can have 2 op-amps as comparator to give the output positive, when the voltage goes from 8 V to 12 V and give ...
1
vote
2answers
113 views

Confusion with short circuits, and when you can ignore a loop

For the image above, when t<0, howcome it's safe to ignore the loop with the 50V source, and the 60 and 200 ohm resistors? How do you know when you can ignore a loop, or when to ignore a part of ...
3
votes
2answers
69 views

Why is the 240VAC-12VDC giving both 12VDC and 26VAC as output?

I was using this adapter to power a 12VDC LED strip and felt electric shock from the output wire. When I measured the output with a multimeter, I found both 12VDC and 26VAC on it's output. What could ...
0
votes
0answers
45 views

Communication Between PIC and PC via PL2303

I constructed a simple circuit. Main purpose is to use RDA intrerrupt when interrupt occured an LED will blink. But I can't get response. I used HYPERTERMINAL to communicate with pic via PL2303 usb to ...
4
votes
1answer
555 views

What kind of transformer this is?

What kind of transformer is this? Which side is Primary and which side is secondary?
0
votes
1answer
205 views

Extra small RF PCB antenna - GND plane

My new PCB design is about 25 mm * 25 mm, this is not enough for a proper 868 MHz antenna ground plane, I am using the 0868AT43A0020 chip antenna where at least a 20 mm * 40 mm GND plane is required. ...
2
votes
3answers
326 views

How is this circuit providing solution of the differential equation d^2 v/dt^2 = -9v?

Book pages at https://books.google.co.in/books?id=d-7owi6uNtMC What I see is that they have taken d^2 v/dt^2 as an input at point A, integrated it to get dv/dt, integrated it again to get v=2sin3t V,...
0
votes
2answers
77 views

Electrical circuit interpretation [closed]

I need to understand the main function of this circuit, and to interpret it. i find something related to this circuit , in a french website (source) (Source)
0
votes
2answers
116 views

Transitor keeps base turned On even at zero volts in dual power supply system!

Circuit Description: I am powering transistor with two power supplies, One supply is providing 5-VDC to its collector load through Ammeter (+Ve - Ammeter - load - collector - emitter - Common/Ground) ...
0
votes
0answers
60 views

Parallel plate capacitance to co-pplanar capacitance

So in my previous experiment, I made a parallel plate capacitor by putting 2 copper plates parallel to each other (the third figure in the image). I then hooked up the AD5933 evaluation board (which ...
0
votes
1answer
80 views

Replacing a Lipo phone battery with a li-ion battery

Is it okay to replace my worn li-polymer 3.8v and 2200maH battery with a li-ion battery with 3.7v and same 2200maH capacity?Will the 0.1v be of any harm to the delicate electronics of the phone?
0
votes
4answers
228 views

Connect 2 SMALL Perpendicular PCBs - Need your creativity!

I'm looking to connect 2 small PCBs. I have up to 10 signals that need to be passed from 1 PCB to the other. The 2 PCBs sit perpendicular to each other, and need to be detachable; 1 PCB is an 8 layer, ...
1
vote
1answer
123 views

Using AD5933 with an external amplification to measure changes of permittivity

I'm going to try and explain my problem statement first and then explain my solution and then ask for suggestions. So, my problem statement is this: To determine changes in permittivity from a ...
0
votes
0answers
156 views

Cheap bench power supply noise

I'm having some trouble with a "cheap and cheerful" bench power supply that I become an owner of. When scoping the outputs I'm seeing some really high noise peaks (see attached photos) in the region ...
2
votes
1answer
98 views

Class A Audio Amplifier

I am trying to design a Class A Audio Amplifier with the following specs: 9V DC Power Supply, Maximum withdrawn current 15mA Used with a Low Impedance (8 Ohm) Speaker Provide a minimum variable gain ...