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Questions tagged [small-electronics]

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0
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3answers
81 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
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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 ...
-5
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0answers
47 views

where can I commission the construction of a frequency electronic device? [on hold]

I have to build a device to pur on the head that transmits multiple frequencies directly to the pineal gland at minimum 100W, it's a device that will be patented as medical equipment, anyone can tell ...
0
votes
1answer
48 views

Current sensor that connected with fan regulator

Circuit diagram is shown Here 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
51 views

Control 220V AC by low DC signal [closed]

Could anybody please guide me about how to control 220V AC by low voltage DC signals such as arduinos. For switching purposes other than relays. Because I need fast switching for dimming purposes tooo....
-3
votes
1answer
121 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
54 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
76 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
114 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
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1answer
30 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
131 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
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
255 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
36 views

Common Collector Amplifier and its name

Why is Common Collector amplifier is also known as Emitter Follower?
1
vote
3answers
157 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
35 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
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0answers
75 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
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2answers
155 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
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1answer
82 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
50 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
81 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
90 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
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0answers
39 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
548 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
160 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
246 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
75 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
57 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
109 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
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0answers
49 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
66 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
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4answers
202 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
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1answer
97 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
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0answers
137 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
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0answers
63 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
90 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
44 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
62 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
104 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
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1answer
98 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
156 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
86 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 ...