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Newbie needs some helpview story

http://forum.allaboutcircuits.com – My son and I would like to build a circuit board that can light a short strip of led bulbs, for about an hour+, that is activated by a loud sound. I'd like to run it on as small of a battery as possible. Have a reset button for the lights and microphone. Something to adjust the microphone sensitivity. I don't know anything about circuit boards and I have never built one. (Embedded)

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general second order circuit problemview story

http://forum.allaboutcircuits.com – Hello there, this is my first thread on this forum so please excuse me if i violate (without knowing ) any rule. Yesterday i tried to solve a couple of general second order circuit problems but i failed in all of them and it was frustrating. So today i decided to post one of the problems here and see if i can get any help hoping that i do the same mistake every time . (Embedded)

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How to incorporate push buttons as well as a rotary encoder for media center?view story

http://forum.allaboutcircuits.com – Hello all. I am using a 12v cd player (just for eq and volume control) and my tablet. FOR AN IN HOME MEDIA CENTER. Where I am getting stuck is with the volume control. It uses a rotary encoder and I would like to integrate my push button controls for volume up and down too. (Embedded)

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Powering an Inductor with 120v ACview story

http://forum.allaboutcircuits.com – I'm building a circuit that is going to use a wall outlet as source (120v AC). I need to cut the power down to run an inductor (electromagnet) intermittently at 50v max off of a capacitor, and also a chip at 3v and 12mA continuously. I can't figure out how to cut down the voltage, and I'm struggling with starting this project as a whole. (Embedded)

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Can current flow in both directiosn simultaneously?view story

http://forum.allaboutcircuits.com – Can current flow in opposite directions simultaneously through the same wire? Attached is a schematic. The two voltages are unknown and could be different values. Both are after some circuit above them, also unknown. (Embedded)

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Maximum Wattage for 220V 5A relay?view story

http://forum.allaboutcircuits.com – Hi there, I bought and installed the following relay on a small 750W heater... (Embedded)

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VFD for 3-P Linear Induction Motorview story

http://forum.allaboutcircuits.com – Does anyone have a suggestion for VFD drive that can drive a 3-phase LIM for 0.5 seconds at 208-240v @ 20A? The input power available is 240v single phase. (Embedded)

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Old radio capacitor cross reference chartview story

http://forum.allaboutcircuits.com – I'm attempting to fix some old tube radios for a friend. I ordered some caps, but the numbers don't jive. For example, 5 of them are .05 MFD, 200v; But I received (5) .047's, at 600v. (I get that one) Another one was a .03 MFD, @ 400 VDC, but I think I received a 333K @ 600V. (Embedded)

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Laser dalekview story

http://forum.allaboutcircuits.com – Hi everyone, I'm new here and rubbish at electronics so I need a little help, I have an r/c dalek which lights a blue LED on the end of its gun when it says exterminate, I successfully replaced the blue LED with a low powered laser (5mw), the laser is powered by its own battery's (two 1.5v AA), the power from the dalek now passes through a resistor (390ohm) and on to a transistor (bc 548) which in (Embedded)

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Simple question please!view story

http://forum.allaboutcircuits.com – sorry but I am a noob to electronics but here goes. I have a 12v DC adapter outputting 2amp which and I need to hook it up to a solenoid which is super strong. I tried with a 12v DC 2a solenoid (20N force) and its really really weak. I then tried with a 12v DC 300mA solenoid (6N force) and its super strong however it soon got hot and went bust (over current I assume). (Embedded)

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DC Boost regulator MC34063 circuitview story

http://forum.allaboutcircuits.com – Hi, I'm hoping someone might be able to help me. I am trying to simulate a circuit involving the MC34063 that's illustrated in the datasheet (attached as JPG) using LTSpice. It's a simple 12V -> 28V DC-DC converter. I downloaded the model (attached) for the MC34063 so that I could use it in LTSpice. (Embedded)

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Prototype for 8x8 RGB LED displayview story

http://forum.allaboutcircuits.com – Hello all fellow electronics enthusiasts! I have a burning question which I can not answer by myself, even after looking through some older posts with a similar titles here on AAC forums. (Embedded)