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Questions tagged [small-electronics]

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0
votes
1answer
19 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
117 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 ...
-2
votes
0answers
44 views

What is current gain of the below circuit? [closed]

What is the current in the circuit?
30
votes
9answers
11k 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
160 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
0answers
28 views

Does mains electrical noise / harmonics affect [little] electronic projects?

First of all, know that I'm a beginner and I'm not well versed in these things, I may be making no sense; apologies in advance. I want to replace one of the light switches in my house with an ESP8266 ...
0
votes
1answer
33 views

Common Collector Amplifier and its name

Why is Common Collector amplifier is also known as Emitter Follower?
1
vote
3answers
149 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
32 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 ...
3
votes
0answers
65 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
153 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
80 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
49 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
77 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
85 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
66 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
38 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
542 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
131 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
201 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
74 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)
1
vote
1answer
47 views

WIll the multimeter continuity test on the SOIC - DIP adapter spoil my IC?

IC : L9637D for ISO 9141 bi directional serial comm. Multimeter: Mastech I am mounting an SOIC 8 IC on an adapter(regular Soic to dip adapter), so I can mount the adapter on a bread board for use. ...
0
votes
2answers
103 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
46 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
48 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
172 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
87 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
110 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 ...
0
votes
0answers
55 views

Could some one help me with this tinkercad file?

I've built this monostable 555 timer circuit.But I can't figure out why the trigger doesn't work ?Tinkercad file
2
votes
1answer
84 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 ...
0
votes
0answers
43 views

How to compare hours in a circuit

I'm attempting to design a smart thermostat with pure electronics (no microcontroller) for the comparisons of the hour I am thinking of using a bit comparator and use rotary switches to set certain ...
-1
votes
1answer
60 views

Ideas needed for a project with a lot of buttons [closed]

Alright so this may sound very weird. Even though I'm 19 years old, I still like electronics with a lot of LEDs and buttons and pots and switches. You know what I'm talking about. I saw this video on ...
-3
votes
1answer
93 views

How many watts does your phone put out [closed]

I am building a custom speaker to play music on from my phone and obviously need to run an amplifier between the speaker itself and my phone. I'm wondering if anyone knows how many watts a phone ...
-1
votes
2answers
59 views

How did we find Vin in this CMOS?

Why did the lecturer decided that Vin is vGSn - vGSp + vDD , Why did he not go through the drain path and used vGDn and vGDp ?
0
votes
1answer
74 views

How can electronics “short circuit” when you plug in cables

I have recently been troubleshooting a component on a CNC machine. The device is connected via etherCAT to the machines controller. There is also a power cable that goes to the component. Basically ...
2
votes
0answers
155 views

Help Identifying this circuit and understanding how it works

So I'm hoping to make a few modifications to my Computer case and have found that a number of the LED elements have an associated circuit to them. I want to be able to understand what I'm doing and ...
0
votes
1answer
85 views

PMR446 interferes with small electronics?

Some small electronic devices react to PMR446 adversely temporarily, when exposed to a PMR446 transmitter, during the transmission. Portable DVD player: Green horizontal stripes on screen. Increasing ...