help

I need help identifying diodes in a 1980 Marantz Amplifier. There are two diodes in series. They are connected at the cathodes. One is marked A27 and the other simply has an H as the only marking. These were added to the amplifier after production because they are not on the schematic. They are...

Hi all Can anyone help me to simulate an IGBT in LTSpice I am trying to create a model for the IGBT in the datasheet attached I am not 100% how I go about doing this in LTspice I know that in the new version of LTSpice there are nIGBT's but I am not sure which parameters I need to add to this...

Good Afternoon I am busy building a static VAR compensator for a project and i need to use TRIACS to switch in my capacitor banks. The system is 3 phase 400 VAC and consists of 3 motors with varying loads. There is a system that determines the power factor and switches in the capacitors. Today...

I'm making an assignment on this topic but so far I've encountered a few problems that I can't figure out. For the OA I've used LM324 whose output voltage is Vcc-1.5V.So for my case I've made these calculations with input voltage of 10 V. I have τ=100uS.UTHL= ±1mV UTHH=±1V I can't reach the...

Dear readers, i'm a high school Science teacher in Belgium and i've entered my students in a Science and Technology fair. They have a good idea but my knowledge about electronics has its limits... I've got 2 general questions first: 1) i've started with Arduino projects but do you guys know...

First off I'm totally new to the electrical scene and only know what I've learned online and hands on. Which can be a bad thing if your listening to the wrong person. So here it is : My Problem : I am using an 18 volt dc lithium drill battery to power led lights and a car horn on a project. The...

Hi, I was wondering whether somebody could help I am a student and am using the Yenka CAD software to program a PICAXE chip, I was wondering whether anybody knew how to perform arithmetic in a flowchart on a variable x such as division e.g. x / 58. Is this possible with this chip /software, or...

Hello everyone, I'm new to this forum so if I post in the wrong place or I make any mistakes, pls tell me! As the title suggests, I'm new to PIC microcontrollers So I just bought a PIC 12F629 but the I realised that I don't have any programmer for PICs :banghead: so do any of you guys know any...

Hi so this is my first post to this site I do apologize if it has the wrong area I was given a basically what I think is a variable power supply, the terms for me getting this nice thing for free was the fact that it is old one and had been through a fire so it was not damaged however had smoke...

Alright, my question is pretty simple to ask but perhaps rather difficult to solve. I am modelling in LTspice a channel of previous design and analysing various noise figure across the channel. Currently I am using the stock resistors supplied in LTspice. I was wondering if there is a way to...

Hello everybody, I am planning on making a motorized Pan/Tilt head to go on a camera jibcrane. My electronics knowledge isn't too well, so I'd wanted to ask all the amazing people here. My plan was to use two 12volt DC motors, powered by a battery pack, to drive the axis, controlled by a...

Once again, I'm stuck on a (likely) not so complex issue but I lack the proper vocabulary to find the answer quickly on Google. Long story short, I've made a calculator using two, 4-Bit BCD Full adders. The part that this post concerns is in between the Input (0-9 Keypad and Decoder) and the BCD...

Hi I am trying to put together a circuit that has 3 buttons for control. Button 1: Power on/Select output Button 2: Enable output Button 3: Power off Each output needs to oscillate the same bank of LEDs but at 5 different preset frequencies (frequency preset chosen with select button). It...

Hey Guys, im making my own tilt servo bracket similar to the one in the picture attached, as part of a school project for an adjustable wing for my whole miniature go kart, but it is due in a few days and i do not own a servo controller/tester or have the time to buy one in time. So im thinking...

I'm currently building myself a 48v phantom power supply for a microphone. I've been using **broken link removed** project posted online for both the powersupply and microphone circuits. So far I've built this circuit below: The problem is the voltage regulator is doing absolutely nothing to...

Hi everyone! Im wondering if someone can help me with something. Namely, i should make a project depicting a simulation of 6 members voting for a choice (one of them is the president and his vote counts as two if voting turns out even). Im going to upload a pdf file of what i did already so i...

Does anyone know how to increment or decrement the dimmer using the lm35 ? Im using this program and i dont know what can i change to do this.HELP! int AC_LOAD = 3;// Dará o pulso no Triac pin int dimming = 125;// Dimming level (0-128) 0 = ON, 128 = OFF unsigned long time;//Contará o tempo...