help

  1. P

    Identifying diodes

    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...
  2. A

    Simulating IGBT in LTSpice

    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...
  3. D

    Triac Blowing

    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...
  4. I

    Schmitt Triger with dynamic hysteresis [help]

    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...
  5. S

    High School project - electrical power generator

    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...
  6. R

    Help! Step down dc without regulating amps?

    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...
  7. T

    Yenka CAD software Arithmetic Calulations in Flowcharts

    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...
  8. I'm new to PIC, pls help!

    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...
  9. Lab bench testing power supply breadboard?

    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...
  10. G

    LTspice Thin Film Resistor Simulation

    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...
  11. Pan/Tilt Head need help designing circuit

    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...
  12. Need help with storing some data onto Register.

    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...
  13. Circuit design assistance needed

    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...
  14. F

    Servo Motor Help

    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...
  15. Voltage regulator circuit that doesn't regulate voltage. Am I doing it wrong?

    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...
  16. 6 member voting projects

    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...
  17. B

    Dimmer SHIELD + LM35

    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...
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