circuit

Hi! I have a question related to electronics: Someone told you that there might be a problem with the electrical circuit: In addition to the standard 50Hz alternative voltage, it mights exist another disruptive frequency at 50.5Hz. For how long, at least, should you measure the voltage in the...

Hello everybody, I have a small question about transistors. I have a npn transistor (bc337). I have 5Volts on the emitter from an arduino. The base goes to a resistor (1k) and then to ground. The collector goes to a resistor (330) and then through a LED to ground. As far as I understood the...

Looking for a plausible solution to the following problem: Background: 1. Currently - simple potentiometer (linear, 100k Ohm) control that controls an AC motor 2. Motor has a dedicated DC control circuit embedded with the following possible control connection points a). "Low Voltage +10V...

Hello, I am trying to make a backup induction heater that will heat up a stainless steel cell (2in diameter by 5in length cylinder, approx. 5lbs). I need to heat it to 100 degrees Celsius, controlled externally by a thermometer so no circuitry needed from temp control (unit will be manually...

Hello, I'm designing a resistive load bank. Currently, I am designing the switch that will be controlled by a control signal via Arduino uno rev 3. The bidirectional switch is composed of two back-to-back igbts connected by their emitters with anti-parallel diodes. (Due to cost, there are two...

Hey everyone, I'm new here and also a newbie who is teaching himself. I have one question: How come if i put resistor R1 before the output, the output is always 1? Even if A and B have an input signal.

Hello everyone, How can we calculate the voltage rating of an SMD ceramic capacitor. Is it dependent on the package size?.

Hello. Thank you for clicking on my article. I'm from Korea and a college student. I'd like to find a solution. My circuit simulation speed is too slow. So I want to speed up. I saw what other people did at Google and made it. I want to speed up the simulation. I'd appreciate your help.

Hi there, got a serious problem about Counters. i have to create "a circuit that counts from 0 to 9 then from 9 to 0 using two separate counters" and "must consider BUS concept". i used two 74192 and two 74153 Multiplexers ( for BUS ), one of the counters is ascending and another one is...

I need to design an Automated system such that a user gives inputs in 3 bits and there's a clock running that resets itself and gives a positive signal after the time indicated by input. We can use logic gates, combinatorial circuits, sequential circuits, counters, registers.

It has been over a decade since I've done anything circuit related, and I found out the hard way that I have forgotten basically everything. I am trying to make a buttonpanel acting as an input interface for PC using an arduino. I want to have 32 different momentary inputs in a 4x8 matrix. My...

as you can see this is the circuit that I made based on lm386N-1 whenever I connect my iPhone (it's a 5s if it makes any difference ) the sounds works great and clean only when I put it to max it has some distortions but when I connect the electret microphone it makes a lot of noise and hissing...

Hi, I made a circuit that charge Li-ion battery. When I simulated it, I found something strange; the time for charging was too short. I made it with 'LTspiceXVII' and here's my circuit's diagram and the graph, also I uploaded the 'Li-ion bat file'. So, would you like to help me if you don't...

Hi there, I have been working on an AM radio test generator. It is from the book ”building your own transistor radios”. I would provide a schematic of the circuit although I believe the copyright would prevent me from doing so. The two ICs used in the circuit are the 74HC14 hex Schmidt...

I need an DC-UPS that can handle at least 300W, but I couldn`t find anything. So I come up with this: Battery: 4s2p Li-ion (3.7V) PSU: 14.8V P-Channel MosFET: IRF4905 (maybe? idk) N-Channel MosFET: idk Will it work? What should I change? Do you have any UPS suggestion? Thanks!

Hello, It's my first post. I'm new in electronics fields. I'm french and my english is not very good, excuse me. I want to make a VHF oscillator(~ 30 MHz) that his frequency can change with the value of the capacitance. I found in an another post the RF2506 which seems to works but it's...

Hello, I am in a research team and is designing a circuit system for powering a motor with battery and supercapacitor. The battery and supercapacitor powers the motor separately and the motor gives regeneration power back to the supercapacitor (motor driver allows for regen). Can experts in this...

Hello, I have a problem which I can't find the solution. It's related with the determination of the bodeplot of a circuit. According to my bodeplot in the simulation, the flat part of the magnitude plot is -23.02 dB (Simulation.PNG) and the cut-off frequency is equal to 17.67 MHz whereas the...

I'm not sure if this has been posted somewhere before, but I can't find anything that really addresses this type of a problem. For college we need to design an amplifier circuit using a transistor, this is not that bad. The problem is that there is no proper explanation that I can find of where...