Questions tagged [small-electronics]

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17 views

How can i use nodemcu in sleep mode

I have a project that based on Iot.I mean human detection notification system using blynk. I want to implement it in home for security system. But nodemcu not work for a long time of period. But i ...
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0answers
57 views

20V -> 5V -> USB

I have a 20V battery, which I wish to use to power a USB device. Do you think I would have any issues wiring the battery up to 2 of these DC Converer/USB modules , thereby having 4 ports working off ...
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0answers
34 views

Which wire is ground in a webcam? [closed]

Which wire is ground?Please specify with colour...?
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0answers
26 views

Any suggestions on a small hydroponic system using a NiMH AAA rechargeable battery to run a pump & small PV cell to trickle charge battery?

Let me start off by saying I am in no way an engineer or electronics pro; merely an amateur/DIY-er and High School Physics & Biology teacher. I enjoy building things in my off time to both bring ...
2
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2answers
211 views

Can we use pir sensor while it's moving?

I fixed the pir sensor on the top of servo motor.while the servo motor's rotation the pir was also rotated by servo motor's motion.but the problem I had founded that pir sensor had always indicated ...
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1answer
31 views

relay voltage drop

I made a simple ultrasonic project with Arduino. Used an LCD to show the distance. Also I want to turn a LED on with a 5V relay with a switch for some reason. I'm using external power supply 7.5V 2A ...
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2answers
50 views

battery wasting via voltage regulator

I made a circuit for a tape(or block) LED that will turn on with 12V. I had two 9V batteries, so for converting them to 12V supply that is suitable for LED I used two linear 8V and 5V connecting them ...
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0answers
36 views

Emergency Lights Battery Backup

and thank you before hand for any help provided. Recently, I made this little Arduino project that is working very well! However, the 9V battery lasts only 24hrs (a bit more since I am using watchdog ...
0
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1answer
47 views

Attempting to switch on and off a 4.5v solenoid with a transistor. using push button to control input

I have a very simple setup powered by a 9v battery. The lock solenoid when connected directly to the battery works great. I have built a test circuit using a push button and a transistor in an ...
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2answers
62 views

How do they produce batteries with the same voltage but different current?

If we take a 12V battery, according to its work place that it works in different current consume. How do they make batteries with the same voltage but different current flow, and why?
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1answer
33 views

Can we use nodemcu in real-time projects [closed]

I have been working on some small iot projects using nodemcu. So I have an idea to make those nodemcu projects into real-time . The places like home, office, school
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1answer
34 views

IR diode radiation spot area

How much is an IR diode radiation spot area? I put some IR diodes (receiver and transmitter) in front of each other and I want each transmitter IR diode only radiates on its reciever and does'nt ...
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1answer
41 views

My counter for my cpu stack alternates between counting up and down

My Counter for my cpu stack is given the up signal at the same time it is given the clock pulse to advance. This happens on the pull from stack instruction so the counter goes back up the stack one ...
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2answers
35 views

5VDC Fan Circuit

I have a 5VDC fan (AUB0505HD), and my ultimate goal is to drive this fan using a 3.3V PWM signal from a Raspberry Pi Zero. I haven't worked with transistors much outside of EE school, so I don't ...
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2answers
55 views

I thought magnets could affect the operation of chips, but I’m seeing apple use them increasing more in their products, am I wrong in my thinking?

I’m a bit confused because I used to use magnets to fix the TV monitor when it had faults in the image, but it wasn’t good to use it that much, but Apple is using magnets in their products such as ...
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1answer
11 views

Functioning Problem In Accelerometer

Hello I have used ADXL335 Accelerometer in a gesture controlled project but I have powerd by 5v output from Arduino Lilypad, so it started creating mess by giving wrong outputs. Afterward I came to ...
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2answers
83 views

FPGA elements complexity

I am confused as to the complexity of the elements shown below. What is the order of complexity of them? NOTE- this is a Pre-lab quiz which is NOT assessed, as seen by the multiple attempts allowed.
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1answer
175 views

Simple Transistor Resistor Amplifier Circuit Question

Can Someone Please Help Me On Solving this. I have tried and stuck..In a point that can I apply Kirchhoff's Voltage Law around R2,R4 loop. simulate this circuit – Schematic created using ...
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1answer
47 views

Controlling Multiple I/O Devices

How to manage multiple Input(Sensors like Temperature, Humidity, etc..) and output(like motors, relays, etc..) devices connected to a micro controller(Arduino UNO). There are more I/O devices present ...
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2answers
45 views

Connecting PLC with sinking output to PWM analog converter

I am using this pwm converter with this PLC. The PLC digital out is sinking transistor type. I changed the pwm converter jumper switch to 24V and connected +24VDc from PSU to PWM terminal and one of ...
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0answers
20 views

How to connect ADF4153 modem oscillator serially with PC without using SDP board?

I tried to connect ADF4153 modem oscillator with PC using STC15W4K56S4 that I bought from Aliexpress. My PC is reading the modem but the program is not, so I am trying to connect the ADF4153 ...
24
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6answers
1k views

How to design electronics to last 40 years or more?

I've been reading about the Voyager space probes and am very curious about how you design electronics and instrumentation for a very long life (40+ years) without any physical maintenance. My guesses ...
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1answer
55 views

Series Limiting Resistor?

I have used a 3.3v and a 4.7v zener diode and please what will be the amount of resistance to operate them without any issues. The test current for 3.3v is 76mA and for 4.7v is 53mA.
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2answers
67 views

Turning off and Flickering of LEDs for some reason

I've been following Ben Eater's You Tube series on building an 8 bit computer. As I built and connected more modules to the same power source, the LEDs connected to the registers started to flicker ...
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1answer
48 views

High frequency filter circuit design

I am a trying to design a design an Electrosurgical interference suppression (ESIS) protection layer to filter out high frequency noise caused by Electrosurgical equipment during surgery. I am using ...
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2answers
59 views

Operational Amplifier diagram

I came across several circuit diagram which make use of op amplifier. What confused me is that in the diagram, there's a basic diagram of an amplifier followed by e.g 1/4 AD8662 (4 of those diagrams)....
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1answer
82 views

Where to start with PCB Schematic optimization

I am new to PCB and electronics design and I just finished designing a PCB that includes POE flyback converter, Ethernet Phy, a li-ion battery charger, and a DC/DC converter. My design is based on the ...
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10answers
4k views

What is a logic gate? [duplicate]

Wikipedia says that it is a idealized or physical device that implements the Boolean function. By this definition I tend to think every digital circuits (say a counter or encoder) as a logic gate. ...
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5answers
157 views

How do I read the state of AC switch, through a microcrontroller?

I wanted to read the state of an AC switch using a microcontroller. S1 is an SPST switch and cannot be changed. What circuit will be required for doing this? I'm using this for my home automation ...
5
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3answers
1k views

Why does the forward voltage drop in a diode vary slightly when there is a change in the diode current?

I was going through Basic Electronics and Circuits by David. A.Bell and there it mentioned that the forward voltage drop in a diode varies slightly with a change in forward current - but there is no ...
2
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1answer
76 views

How should I power a 3V toy motor?

I'm helping my brother (8) build a small toy car powered by a tiny 3V motor that we have at home. Most tutorials we've found on the internet suggest using a 9V battery, but never specify the voltage ...
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2answers
93 views

Logic Implementation

I need to implement a circuit but Im having some trouble since Im novice on electronics. I have 4 inputs. A being ON/OFF switch. B is an Inibitor. C is an Emergency and D is not an adequate ocasion. ...
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0answers
79 views

Small inductor coil in VCC, why it helped?

I have two devices, which I do not know about their internal circuits, and they communicate with each other. The communication between them is made by four wires, VCC, GND and two communication wires....
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3answers
545 views

Why use a PMOS transistor instead of a diode for ESD protection?

I am working on updating a PCB design by adding ESD protection to the power supply. I see that an experienced engineer at my company has placed a PMOS transistor rather than a series diode, and I'm ...
1
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1answer
64 views

Transistors and Diodes maximum current per size

As you can understand my knowledge in electronics is limited. I am trying to find throughout the internet a way to find the maximum current I can put through a transistor or diode versus their size. ...
0
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1answer
120 views

Can I use a 24V, 1A fuse for a 5V application?

I have a 5V power supply which needs protection. I only have a 24V, 1A fuse. Can I use this fuse for the 5V power supply. As Watt = R * I * I = V * I. As rated W is constant for a given fuse, will ...
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2answers
219 views

Deviation from typical I-V characteristics of a diode in high frequency

Why the diode shows a loop in the I_V characteristics?(Diode part N4003, Frequency was 100k) My instructor told me something regrading the retardation of charge carriers but I couldn't understand/find ...
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2answers
72 views

How can I connect a sensor to two LEDs so that one will work when the sensor's output is HIGH and the other when it's LOW? [closed]

(Moved from the Arduino stackexchange) Let OUT be the sensor's output. If I connect LED1 to BAT+ and OUT LED2 to BAT- and OUT is this Ok? Instead of LEDs those could be units that need even ...
0
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1answer
44 views

Insufficient current using Elegoo UNO R3 and breadboard

I'm completely brand new to electronics and just bought a breadboard kit to try and get my feet wet. I have a 9V battery and I'm trying to fire up a green LED. I have a 330 Ohm resistor in series ...
0
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2answers
86 views

Need a processor to be able to turn off its own power

I have a processor that is powered by a mains 5V power from a wall adapter, and has a short term battery backup. I need the processor to turn on automatically and immediately when 5V mains supply is ...
2
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2answers
94 views

What is a readhead?

I found this term many times on this website : https://www.renishaw.com/en/rgh34-incremental-encoder-system-with-rgs40-linear-scale--6450 It seems to be something related to a sensor or a transducer, ...
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2answers
52 views

Trigger based on Time Difference between two sensors / Catch a Miss on sensor

I have two Sensors S1 and S2, S1 is a 24v inductive proximity sensor which i isolated using octocoupler to work at 5v and S2 is a transmissive type phototransistor sensor, both are placed at a fixed ...
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0answers
28 views

Isolation voltage of a flyback transformer

How to calculate the isolation voltage of a planar flyback transformer? Or if there are any standards about it? I am designing a planar flyback transformer that need an isolation voltage of 1000V, ...
1
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1answer
57 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, ...
1
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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.
0
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1answer
147 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
144 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 ...
0
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0answers
57 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
217 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 ...
0
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0answers
61 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 ...