Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Hello,
I am planning a semester research project to see if I can extend a battery's life before needing charging using ambient signals like RF, indoor lights, thermal etc. These are the presumptive materials I have come up with to do this. The Arduino circuit will basically show temp, humidity...
I have a pre-assembled DIY project I am working on for the sake of practice, and I'm perplexed as to how to power it on. Below is the schematic.
Based on it, VCC is on pin 7 of U2 and GND is on pin 2. However, the U2 component is not a typical IC as it's a board…
I have a 4.5V power source but...
I am working on a project that I am currently planning on using an MP2636 which is a power management IC for a single cell lipo battery with boost. Currently I have a DF Robot board that has the IC integrated but I would like to add a soft latch momentary switch to turn the system output on/off...
Hi, im a noob :)
Trying to build a gps ear tag for my cattle.
The problem is: Load starts up when battery is 3V. Battery drains to 2.9V due to startup of load. Load turns off. Solar panel charges battery to 3V. Load starts up. Battery drains to 2.9V again due to startup of load. Load turns...
I just read a news that was over a week old, it was about electrocution in a local city's apartment complex's swimming pool. A girl child has said to be dead due to electrocution in the swimming pool, while she was in the waters. She had screamed in pain during the process, and was taken over...
Hi there,
I have to wire up x3 5 pin illuminated push buttons for a prop replica, and just need a little guidance on powering just the light in the switch. The switches will have to function other than to be lit up.
These are 12v switches. Do I need a 12v battery per switch, or is there a...
I am making an ultrasonic transducer cleaning circuit. Please guide me on how to make it as I am not an expert in electronics but have some skill in it. It has to be a few hundred watts in power, say 500 watts.
Here is my idea: As a power source I am using a variac rated at 2000 watts. It is...
Hi People,
I am using an LM 319 High Speed Comparator to produce high frequency square wave as shown. However, from the first diagram, I assembled the connections based on second diagram, it does not work. The V+ and V- that is negative rail and positive rail I used is +9 and -9 V from 2...
- At a given KV rating, will a motor with higher Watts have more torque?
- At a given watts rating, will a motor with lower KV's have more torque?
- Can we calculate KV from rpm and volts? Eg, 4900rpm/72V=68KV ?
Hello, I have an 125 mm angle grinder with 720 W AC motor and soft start (attached pdf document). I want to build a speed controller for this angle grinder. I tested a simple triac dimmer (from the attached jpg schematic) but it doesn't work normally, because it is making a strange buzzing...
Hello, I am using an Arduino Uno for a soldering station project. I am powering the Arduino through USB port using a L7805 regulator and I saw that if I remove the USB power, the ON led still lights up when I am powering the soldering station. Also, the other led's are semi light up. The Vin and...
Hi, I'm quite "new" to the world of electronics I have a CS background and I have a quite old tablet laying around that has power supply issues... it started randomly turning off so I used it with the charger plugged in for a while and now it doesn't turn on.
I managed to start disassembling and...
I have many strings of LED Christmas lights, but they flicker on 120 VAC. If I could feed them 120 VDC, that would solve the problem. Simple bridge/filter circuits produce 170 VDC, wchi will burn out the lights pretty quickly.
I've come across a few circuits that seemed unnecessarily complex...
I'm working on a small electronic device (rf remote receiver to home automation system bridge) that I would like to package into a small box that plugs directly into the wall. I am, however, having some difficulty locating the "plug" component. I can find plenty of sockets into which I can plug...
Dear all,
I am trying to build 3 phase voltmeter that could measure L-L and L-N voltage during 3 phase 3 wire and 3 phase 4 wire connection. 3 phase 3 wire and 3 phase 4 wire connection are external connection.
as we know in 3 phase 4 wire we will get neutral reference so we can get...
Hello everyone,
I need the help of the Community,
I am working on a project, I need to create a device that can open or close a door lock via Bluetooth, this device works on batteries and it is just a simple adapter that you plug on your existing door lock, you just put the key Inside and it...
I've been having trouble deciding how to design a 194.0 °F (90ºC) bioreactor for cell culture (not cell culture now but I do need to get to that temperature to take a sample). Its supposed to be an incubator, basically a 3mm thick 5.5"x5.5"(14 cm) acrylic box, but I'm not sure If I can reach...
This might be a super obvious question to most over here, but I know nothing about power supplies, so please bear with as I try to explain what is going on.
I have one of these SPS705 68VDC power supplies running inside a rather simple stepper motor control box...
Hello
I want to make an auto relay timer circuit such that it turns on the load connected to the relay for 2 min then turns off for 10 min and repeats this cycle indefinitely.
I have a few 555 timer lying around was hoping if could make something out of it. The timings doesn't needs to be...
I know that it is possible to measure the power dissipation in LTspice according to this source:
"To measure the wattage dissipation of a component , place the cursor on the components and press and hold down the ALT key, a thermometer cursor should appear. Read the Watts on the bottom screen...
I need help with the design of a 12v-24v forward converter, i need to be shown the maths for working out the output inductor and capacitor values and the turns ratio of the transformer (which i think ive worked out) please help. dissertation work
I'm working on a project involving the simulation of NTC thermistors both in LTSpice and my own optimization scripts in Matlab. In the process of debugging, I noticed that LTSpice was producing unexpected behavior for a circuit I'd put together. The circuit in question is a thermal anemometer...
Maybe a silly question,
I understand that when an electrical load is placed on a generator, the generator produces a counter torque, thus requiring more power to maintain the rpm. I was just wondering are there any electrical generator designs that produce little or even no counter torque, or...
I am trying to build an escape room puzzle, where someone holds a key fob up to a sensor and a maglock opens, and I went online to buy something that I assumed was ready-in-box but instead they sent me the photo attached which I'm 99% sure was originally a car immobilizer and is now being used...
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