electronic circuit

Hi all, I need some help with what is probably a simple fix. I received a composter second hand and when initiated all components work. Panel and touch screen work, motors work, fan work, the only part that does not work is the heating element. Attached are some images of the heating element and...

hello, sorry for my bad english I have two problems which i don't know how to solve and I would be really grateful if you could help me: 1. The maximum value of alternating current of 50 Hz frequency is 200√2 A. The time countdown starts from the zero value of the current in the increasing...

Hello, I have a npn transitor configured as a switch 0v to 5v gpio pin with base resitor 2k and a 50k pull down resitor in a volatge divider configuration. I wanted to know if this pull down resitor will be okay with Ic current about 20-30ma or I need to decrease it more as the rule of thumb 10x...

HI! I am new to electronics .planning to do fm bug for college project can someone explain this circuit in detail

hey guys i,m new to this forum and Lt spice I am planning on building a FM bug using hardware, i am trying to simulate this circuit using LTspice In simulation i am replacing the microphone with a voltage source of 10mV and 2kHz then removing 68k resistor. simulation file is attched.Kindly...

Hi, I don't know exactly on designing H-bridge motor driver using BJT. I have no idea in selecting BJT's for required specification and selecting current limiting resistor values. Is it required to use zener diode as a protection to the circuit? Kindly guide me. Thanks & regards Guru

Greetings, I am facing issue with TPS61240 as a buck-boost converter. I am using TP4056 to charge the battery and DW01 (and FS8205) to protect the battery by referring this blog. Also, note that I want to operate the other module; due to this I am using this below shown circuit to high/low...

Hello guys , i am a novice engineer and i have an old linear power supply for a video door phone system. The P.S. has a 12VAC output (good) , a +15VDC output (bad) and a +18VDC (good). DC outputs share same GND. The problem is when there is no load on GND and +15VDC output i measure a voltage...

Can anyone please solve this problems ?

Please help me to understand this circuit about analysis voltage each point and how to calculate time charge and discharge time on triangle signal. If use Op-Amp NJM2904C Thank you.

I tried to solve the equations I got but when I make substitutions I get to a deadlock where I can't substitute anything anymore. The equations I obtained are: i2=i1+i2 i3=i4+i5 i5=i7-i6 i2=i4+i6 3i2-i1R1-i5R2=0 2v-i2R3=0 -i6R4+2v-i5R2=0 Could someone help me understand step by step what...

So basically I’m trying to create my own electromagnets and conduct my own experiments. I’ll have an arduino microcontroller send a current into the wire that is coiled around the magnet, thus increasing the strength of the magnetic field, which in turn will touch with other magnets. I want to...

Hello all, I’m helping my daughter with a design project and part of it needs a simple led control circuit. Using a single push button and 4 leds, I need an ic circuit that would light led 1 with th e first button push, led 1 &2 with the second, led 1,2,&3 with the third button push, leds...

We are suppose to make a complex ckt with a 9v battry, a buzer and 2 lights. MY battery keeps heating up. Should i try a lower volate bulb?

Hi, I'm Nayan and I am working on a project to control the reverse flow of current and voltage of an AC power source from a small inverter circuit. This would be helpful to connect an On-Grid solar inverter to stop the feed-in mechanism to the reference power source to run the inverter in power...

I am using seven segment in my project and i was using common cathode and using npn transistor i was able to switch by making arduino pin HIGH. But now i want to display the data on seven segment when i make the pin as LOW. I mean i want to select the Segment when i will make it LOW. i was...

In cyclic voltammetry application (as per circuit design given in image), the voltage difference between reference electrode (RE) and working electrode (WE) will be constant. As per REDOX process (Reduction & Oxidation), the current will flow between counter and working electrode. The circuit...

Tesla Coil Not Working. Transistor Getting Extremely Hot. See The image Below. I Did not use a switch and i did not use an led

I am using a relay to turn ON/OFF the AC load. But when i turn ON and turn OFF the AC load (230 VAC) 3-4 times my controller gets hang. Here is my circuit diagram for the relay. The ground is common in all over schematic. What changes do I need to do for improving the noise?

I want to measure a current consumption for DC fan. I am using OPA2197 opamp for the same. Following is the circuit diagram. i want to understand if this circuit missing anything?