These are part of AC to DC conversion. A half-wave rectifier keeps only the positive part of the signal. A full-wave rectifier also keeps the negative part, but flips it to make it positive too.
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1answer
64 views
Home made USB charger based around LM2596: Smoothing caps
I'm embarking on building a home made mains USB charger based around an LM2596 DC:DC converter. I had a couple of Newbie questions.
Can I connect 5 or 6 USB plugs to the output of the LM2596 ...
4
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3answers
168 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 ...
3
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4answers
160 views
How do I attach a bridge rectifier to a PCB or breadboard?
Newbie question here...I need to know the proper terminology so I know what I'm looking for. I have a bridge rectifier that has four flat blades on the bottom.
I want to throw it on a breadboard to ...
1
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2answers
83 views
easiest way to detect a switch change using an arduino
I have a pinball machine thats an old electro mechanical type. I want to add LED's and do some fancy programming on an Arduino to animate the lights according to the score value of whatever target ...
2
votes
1answer
142 views
Capacitor in an voltage doubler
In a standard diode voltage doubler (multiplier):
Does the capacitor also plays the role of smoothing out the output voltage?
2
votes
2answers
174 views
bridge rectifier connected to a raspberry pi gpio
I'd like to connect a bridge (full wave) rectifier to my Raspberry Pi (RPi), GPIO pin 22 (configured as an input). I have configured the rectifier such that it has a 120VAC input and 3VDC output (I ...
2
votes
1answer
123 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 ...
3
votes
1answer
205 views
How does one compute the ripple currents seen by a rectifier filter capacitor?
Suppose one is designing a full-wave rectifier bridge, with a known maximum current load, and a known input inductance. Assume three-phase for this example, though the same concept applies to ...
3
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2answers
160 views
Voltage doubler or not?
I got a quick question! Is the circuit depicted in the link indeed a voltage doubler or is it just a bridge rectifier with smoothing capacitors?
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1answer
122 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), ...
2
votes
4answers
196 views
Can I use single phase 220v AC to power a rectifier designed for 3 phase AC?
I want to use a use a rectifier (Eltek Aeon SMPS 4000 Rectifier, used in telecom) as a stand alone DC power supply (puts out 24v/125a). The unit was designed for 3 phase 220v AC input. I have only ...
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2answers
214 views
LTSpice simulation of rectifier slows down after short time
I have the following simple circuit set up in LTspice:
Blue is on the output of the transformer and green from the rectifier.
If I don't include a capacitor this works fine and the simulation goes ...
1
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1answer
175 views
10V DC Power Supply help
I've been researching power supply design techniques and information for the last few days and feel like I have a good understanding of how this is to work, but I can't seem to get my simulation to ...
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1answer
72 views
Vrip equation doesn't seem to work
Okay I got a question on how to design a full wave rectifier circuit.Okay I just read a text-book of malvino's principles on electronic and devices.
Let me tell you I have an input voltage of 64 ...
2
votes
2answers
185 views
Can I make a rectifier to convert from AC to DC?
I have a project that calls for an 18VDC power supply. I've found one that meets specs online for about $40.00, and I've found an 18VAC power supply that meets specs (apart from being AC) at my local ...
2
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2answers
482 views
Why do we use bridge rectifier?
If we already having a center tap rectifier with just two diodes doing the same work then why is there a need to use four diodes or the so called Bridge rectifier.
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3answers
347 views
Full-bridge converter rectifier kicks
I'm in the process of building an 8kW isolated DC/DC converter, full-bridge topology.
I'm seeing some interesting phenomena on the diodes. When each diode becomes reverse-biased, a voltage spike ...
2
votes
2answers
218 views
Bridge rectifier in parralel?
Is it possible to safely double the current limit using 4 bridge rectifiers? In one forum I found someone wrote:
Use four bridges, one for each leg. Tie the AC input (cathode to
anode) ...
2
votes
2answers
260 views
In this project, where does the rectifier go?
I was a backer of an early Kickstarter project, and now the project leads have dissapeared. Before they left, they offered some advice to fix some of their faulty units. Here's a picture of the ...
2
votes
3answers
248 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 ...
0
votes
3answers
91 views
Can I half the current rating when moving from 100-240V to just 230V?
I am repairing a failed ATX computer power supply (PSU). It is rated 100-240V 9A input, 620W max output. Its 10 A bridge rectifier is dead, and I am able to get at most 8 A bridge rectifier as a ...
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votes
2answers
1k views
Selecting the right bridge rectifier
There are a number of schematics I'm trying to interpret that have bridge rectifiers. In the components list, however, they're simply listed as "D1-D4 rectifier unit" without any specific values.
How ...
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2answers
202 views
Using LEDs in a bridge rectifier for light, not load
This is a two-part follow-up question (which wouldn't fit within the 600-character limit for comments) to Using LEDs in a bridge rectifier circuit. I appreciated Anindo Ghosh's response to that ...
0
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0answers
69 views
Plot double sided spectra from graph
I am have trouble with the problem shown in the image below:
My initial thoughts would be that the amplitude for any f would be 1, and the phase would be a multiple of pi, but I'm pretty sure thats ...
3
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1answer
146 views
Inductive Reactance
I was dealing with a 'single phase full wave bridge rectifier' with an inductive load in my lab class today. In order to calculate the efficiency values, I need the inductive reactance
...
0
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1answer
232 views
Getting 3.3 (V) from a 5(V) rail - Emitter Follower, or something else?
I am using a Bluetooth module (RN-41 SM) that is spec'd to run at 3.3(V).
I can operate this module at 5(V) however, due to another part of the circuit, I need to run the micro controller at 5(V)
...
6
votes
1answer
404 views
Center tap split supply question
Lest's say that I have the following setup:
a split supply (using two voltage regulators: a positive and a negative one) connected to a center tapped transformer (12-0-12). The output of the ...
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2answers
749 views
How can I Build a Full Bridge Rectifier?
For further detail, I plan to extract an alternating current and convert it to direct current. Suppose that the AC flowed through the wires; how can I make it a direct current using the full bridge ...
4
votes
6answers
2k views
How are bridge rectifiers rated?
So I'm getting ready to build a power supply, and it calls for a bridge rectifier. However, I can't find any information about HOW rectifiers are rated, except for a note that (and I don't have it in ...
2
votes
3answers
422 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 ...
2
votes
2answers
1k views
How do I test a bridge rectifier?
I got a mess of components at an auction a couple weeks ago, including an unmarked box of unmarked bridge rectifiers. They're about 1" square & 1/4" high if that makes a difference in terms of an ...
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1answer
181 views
Simulation problem in pSpice 9.10
I just started to use PSpice. I created a rectifier in PSpice 9.10, but somewhere I'm making a mistake and I don't know where.
The output:
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0answers
231 views
Bridge Rectifier Average Value Modeling
I had previously posted a question regarding modeling the transfer function of a diode rectifier but it sounds like this not possible.
So I have done some reading on "Average Value Modeling" and it ...
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1answer
373 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 ...
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2answers
582 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?
5
votes
2answers
566 views
Op amp rectifier : transfer function and output impedance
I'm working on an EE student project which uses a rectifier to keep the peak value of a sine wave.
You can find a PSpice pic of the schematics below (Ve is the input (1kHz), Vs is the output).
Op amp ...
5
votes
2answers
617 views
Isolation Transformer
When a function generator is used to power a full wave rectifier an oscilloscope will not show the correct output due to a shared ground. A half wave is displayed because one of the diodes is ...
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1answer
484 views
Regulated DC supply - need help with calculations
I am in the process of making a regulated power supply to convert AC(220V, 60Hz) to DC(9V, 500ma). I have worked out all the calculations and would appreciate if someone could double check just to ...
3
votes
2answers
309 views
What efficient techniques exist for rectifying high voltage?
I want to rectify 120V (mains North America) at a relatively high amount of current (5 amps), so naturally my first idea is to just find a bridge rectifier. After finding one capable of the current ...
5
votes
2answers
1k views
Serial capacitors in electronic ballast of a fluorescent lamp
Recently I repaired one broken electronic ballast of a linear 30W fluorescent lamp. Now it seems to be working as expected, but I had to make some changes to it and I'd like to ask if you see any ...
10
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4answers
3k views
Is full wave rectifier better than half wave one?
I am curious if there are practical differences between a DC power supply based on a half wave rectifier or a full wave rectifier.
I mean I have a few small DC power supply units which should give ...
3
votes
1answer
761 views
Modding a dremel to accept 230volts
I purchased a Dremel tool from the United States and using it in India. As always, the trouble is with the power inputs. A step down converter is simply too expensive for those power ratings (>2 Amps ...
3
votes
2answers
515 views
Using a rectifier and chopper in place of a transformer
Is it possible to use a rectifier and chopper instead of using a transformer? Is this something people have done before or that might be possible?
1
vote
1answer
377 views
AC to DC rectifier, smoking
I have built a LM317 power supply, which is working nicely through a DC wall wart and wanted to hook up to an AC transformer so it can run off mains and free up my wall wart, so I made up the below ...
2
votes
3answers
3k views
What happens if an AC voltage is applied to a battery?
Today I was checking the voltage between charging terminals going to the battery of emergency lantern using a multimeter.
The multimeter showed a DC voltage of 9V and an AC voltage of 4V.
Could ...
10
votes
3answers
557 views
Simple \$12V_{AC}\$ to \$12V_{DC}\$ Rectifier
I want to convert a \$12V_{AC}\$ power supply output to use \$12V_{DC}\$ to power some outdoor LEDs.
The power supply as it stands will light the LEDs (with a slight flicker from the reverse ...
15
votes
1answer
4k views
What are the advantages of full wave bridge rectifier with capacitors parallel to diodes?
I found a circuit where in the classical Graetz rectifier capacitors were added in parallel to each diode.
It looked something like this:
After the rectifier itself, there was the usual huge ...
7
votes
3answers
5k views
if a standard three-phase 400V AC connection is rectified what DC voltage comes out of it?
If a standard (in Europe and a large part of the world except North America and Japan) three-phase 400V AC (three lines having 230V RMS voltage if measured to neutral each) mains supply is rectified ...
6
votes
5answers
267 views
Help Understanding a signal rectifier
I was reading an electronics book and came upon this circuit.
I am having a difficult time understanding why the voltage across D1 is 0.6V. I understand that that the reason is because the input ...
8
votes
4answers
3k views
How does this rectifier work?
In a car battery charger, I found a strange rectifier. Can someone explain to me how does it work?
Here I have a transformer which is unmarked. By measuring resistance between its output terminals, ...
