Tagged Questions

36 views

Transforming 240 VAC to 5V/gnd

My 240 VAC relay can be either on or off. I'd like to transform that to 1/0 signal for an input pin on my Arduino. I may be able to build something with a rectifier, a step-down and a couple of ...
83 views

Full-wave rectified sine wave representation?

Let us suppose I have an input voltage $V=V_0 \sin(\omega t)$ connected to a full-wave rectifier bridge which changes the voltage to $V=V_0|\sin(\omega t)|$. Now, if I want to work out the voltage ...
51 views

Is it possible to run a Buck converter with rectified AC supply voltage?

I know that a standard Buck converter requires DC voltage as input. But if your primary input supply is a high AC voltage, it is not very easy to make a clear DC voltage out of it. For example, if I ...
196 views

precise half-wave rectifier problem

I'm actually trying to build a precise full wave rectifier. But after a first failed try, I though I would better be off break down things to analyse every part of the circuit. So, I started building ...
971 views

Why don't more devices incorporate full-wave rectifiers as reverse polarity protection?

Recently, I was introduced to the idea of using a full-wave rectifier, in order to protect against reverse polarity damage in DC devices. I hadn't even considered using a rectifier in an already DC ...
119 views

AC rectifier and voltage regulator

I'm a mechanical engineer and my knowledge of electronics is letting me down please help. I'm looking to run a 1.5V led from an input signal that can vary from 0.3 to 0.5V ac. I want to make the ...
843 views

Driving Permanent Magnet DC Motor via PWM

SUMMARY: I am currently trying to finish up a DIY project I've been working on for a while: Building an electric potters wheel. I acquired a treadmill and salvaged quite a few good parts from it, and ...
245 views

Common DC ground with two bridge rectifiers

I have an old AC transformer with many taps off it at different voltages. Connecting a voltmeter to tap 2 and tap 3 gives 25V and connecting it to 3 and 4 gives 5V. I connected them to two bridge ...
216 views

Can I use more diodes to reduce the voltage off a diode bridge?

I have a transformer labeled as providing 9Vac, 3.36 A. It appears to provide 9.4 v ac according to my multimeter. It runs through a diode bridge (WAB 040 diodes -- already fried the last version), ...
508 views

How can I power and dim two sets of LED lights where one requires12VAC and one 12VDC

I am building a wall unit and I would like to use some LED Tape Light (12VDC, 48ft Total 1.45W/Foot) to light the shelves. Then I'd like to use a 12VAC adjustable LED spot light (5W) for the center ...
572 views

AC heater, bridge and MOSFET, possible?

In my project I already have all the circuits for a PWM driving some high power MOSFET. Now the hardware guys are coming with this AC heater, and I've been breaking my head around Triacs and phase ...
486 views

Electric circuit AC plug to DC Design Help

I'm new to designing electric circuits... but I have a simple project that I really need help on. All I need is a AC plug source to be connected to a 100 WATT bulb and a 3V motor(motor should only ...
810 views

What do we use to convert AC to DC current in houses

Do we use an active or passive rectifier to convert AC current to DC current, and why?