All Questions
Tagged with rectifier voltage-regulator
46 questions
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Buck / Buck Boost converter as a regulator or rectifier question
I have an older boat with a rectifier like https://www.ebay.com/itm/282755134541 . I understand that these will output 14-17V+ DC. With an increase in RPMs, I understand that the DC voltage increases. ...
0
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1
answer
51
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Trying to supply LT8253 from AC source
I need to design a 50W USB-PD circuit. TheLT8253 is a DC-DC converter supplied by 24V DC. This circuit must be supplied by a 230V 50Hz AC source. I tried to design a basic AC-DC converter using an ...
0
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2
answers
89
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AC to DC supplier values not even
I've been trying to make a dual power supply from AC signal to power some op-amps, but the value I'm getting is very far from even. I'm getting +15.5V from the positive pin of the rectifier and -7.7V ...
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2
votes
1
answer
133
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Required transformer voltage for voltage regulator tubes in series
First of all some small context: I am attempting to design and build a clock with old electricial components, without silicon components. This question is about the power supply circuit. Note that I ...
user326520
0
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2
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178
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On a 12 V car alternator with possible failure of the rectifier diode causing drainage, could an electronic component be added in-line near battery?
On a 12 V car alternator with possible failure of the rectifier diode/s causing drainage, could an electronic component be added in-line near the battery? Such as a voltage regulator or diodes in line ...
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47
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Engineering specs for converting AC to DC
I’m experimenting with electricity generation. I am generating 110V AC, wattage and amperage unknown (after a step down transformer from 400V), and I want to rectify the AC into around 130V DC to run ...
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5
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3
answers
1k
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The use of capacitors in voltage regulator schematic using 7805 and 7812?
I'm a newbie in electronics so I lack a lot of basic electronic knowledge.
I found this schematic about making regulated power supply 5 V and 12 V DC from AC. The diagram is below:
This is what I ...
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2
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348
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Honda CBX 1979 Regulator/Rectifier - Lipo (lifepo4) battery
I exchanged the OEM battery (PB) of the CBX 1000 motorcycle with a Lifepo4 12V battery. It is smaller, lighter and has a much better CCA. However, the connector (wires at the bottom side of photo) ...
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1
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248
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High current "booster" circuit with 2 outputs?
I need a 2 kind of voltage for my project - 24V/2A and 5V/2.5A, and I found that a good way to ensuring high current with 78xx is to add a bipolar transistor - I wonder if I connect two such current ...
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2
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1
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443
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LM2596 voltage regulator not providing steady voltage
I was trying to simulate a 3 phase AC full wave rectifier, and wanted a 5V output.
I connected an LM2596 module to turn the rectified voltage into the desired 5V output and ran the simulation in ...
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1
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34
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Design a circuit in Ltspice based on the input and output
I need to design a circuit that takes a sinusoidal input with peak of 8V and generate an output such that the positive peaks remain the same and the negative peaks get inverted and have a peak of 4V.
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1
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131
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Synchronous Buck Converter Mathematics
Ive been trying to find a mathematical explanation on how a Synchronous Buck converter maintains continuous operation under ideal steady state conditions. I understand the underlying concept but i ...
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83
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Fan speed slows down, the moment a new load is added
I am using a rectifier, and 4500uF capacitor to reduce the ripple. After connecting to the power source (60Hz, 120V), I was able to turn on the fan. The issue occurs when I turn the switch on to power ...
- 195
1
vote
2
answers
95
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Analogue current and voltage regulation and rectification thereafter
I am a research scholar working on mechanical metallurgy as a part of my engineering study.
For my project (a new kind of electroplating,) I need voltage ranging from minimum 0V to maximum 170V DC. We ...
-1
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1
answer
152
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What is the function of zener diode in the fig and power dissipated in zener at No load condition?
If supply is producing max 20mA at 9V what will be the value of Rz?
To improve the current capability, how can we use NPN transistor instead of diode here?
Ans: According to my understanding, it is ...
2
votes
1
answer
81
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Rough calculations for heatsink and mains current
I'm designing a rectifier to output two voltages. Because of the output voltages, I'm using two transformers to get the needed input voltages as shown in the schematic below:
simulate this circuit &...
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3
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259
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Powering small DC load ( 1W ) using 220V AC supply
I am trying to design a small control circuit for controlling large currents (not too large, around 200W, AC 50Hz). I have kept in the AC circuit isolated from the DC control circuit. But the problem ...
0
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1
answer
57
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How does an optimized car battery charging system could be designed?
To start, I saw a scooter electrics. In that implementation, after quite a weak (in my sense) generator it has some shunt linear regulator, that just dissipates overvoltage to heat. Oh god! Weak ...
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0
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42
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Simplest and chepest way to provide 3.3V@150mA from power supply running at 6Vrms@120mW
I have a power supply that can provide 6Vrms (50kHz) and 130mW max (maybe a bit more). Unfortunately, for my project I need a peak of 150mA in 3.3Vdc (ESP8266) in regular basis during TX but most of ...
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4
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2
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What is a typical reverse recovery time for a Zener diode, or is reverse recovery time not applicable to Zener diodes?
A little background: I am trying to understand how Zener diodes respond to high voltage transients. I stumbled across discussions of reverse recovery time, and I'm curious how it applies specifically ...
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1
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379
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How the voltage stable mechanism work in Bridge rectifier?
We all know that the purpose of Bridge rectifier is to change the AC to DC,and the picture below is my assumption,and as i know ,the Q1, Q2, D2 and the first level RC circuit are the filter and ...
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1
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1
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839
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Rectifiers in parallel - mosfet
I see the question has been asked a few times about using rectifiers in parallel to get a higher current rating and this is not advisable however I wanted to ask how this would apply to a active ...
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2
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5k
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Designing a BLDC generator
I am trying to design a brushless DC generator system for portable use of charging batteries and if suitable possible hybrid power system of an aircraft.
The "BLDC" motor/generator will be connected ...
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1
vote
1
answer
190
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Is it ok to use an AC leg as ground?
I'm powering (hoping to power?) two boards from one 12V AC source. One is a preamp requiring 12V AC in (easy so far) and the other is a scavenged audio board requiring +12/-15V DC.
I'm using the ...
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3
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1k
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Running an Arduino off an AC Circuit with a Bridge Rectifier
I am having an issue running an Arduino (requiring a 3.3V power input) from a 21V AC circuit. The input of the circuit is from a doorbell transformer and provides 21V AC. Then the AC input passes ...
user165102
2
votes
2
answers
1k
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What is deciding the current of an AC to DC circuit
I'm a beginner, trying to build a power supply based on the sketch below to convert 230V AC to 5V DC. My final aim is to supply precision voltage for Arduino, which I think is 5V 700mA.
Here is the ...
- 669
1
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3
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18k
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How to calculate ripple voltage in this bridge-rectified zener-regulated circuit?
For one of my labs I need to design a power supply with the ripple less than 1% of the nominal 4.7 V value (since Vz = 4.7 V) and calculate its load regulation.
I know that the ripple will most ...
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4
answers
7k
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3-phase regulated "ideal" rectifier
In motorcycles broken stock voltage regulator is a very common issue.
Stock solution is SCR based and commonly burns due to overheat/ SCR failure.
DIY regulators usually have the following design (...
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2
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4k
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3-Phase Permanent Magnet Alternator with Regulator/Rectifier (SCR) Output Waveform
So I've been troubleshooting some electrical problems with a motorcycle charging system, and I need a little assistance understanding the output waveform:
Per an article (which I don't have enough ...
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3
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3k
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How to: The basics of transformer VA calculation for voltage regulation using full wave rectification
Likely this procedure has been repeatedly discussed here. But I want to put the pieces together in this certain domain.
So let's say we need to get +/-12V at the outputs rated at 1A using classic ...
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4
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4
answers
4k
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Is a linear voltage regulator necessary in AC to DC?
I was doing research on AC to DC power supplies and I came across a lot of schematics that use regulators like the one below:
credit: http://www.instructables.com/id/Make-a-simple-12-volt-power-...
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2
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710
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Between a full wave rectifier circuit and a half wave rectifier circuit which has a better(i.e lesser) voltage regulation?
I know that voltage regulation is give by
$$ V.R.= \frac{V_{nl} - V_{fl}}{V_{fl}} \cdot 100 $$
where \$V_{nl}\$ is the no load output voltage and \$V_{fl}\$ is the full load output voltage.
I can ...
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1
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190
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Combining two different voltages into one regulated voltage at higher amperage
The Commodore 64 user port has a +5V supply at 100mA and a 9VAC supply also at 100mA. I need about 150mA from the port at 3.3 volts.
Is there a way I can use both supplies to get the amperage I need?...
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1
answer
220
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Dual Dc regulated voltage circuit design
I'm working on my term project which is designing a dual DC regulated voltage that gives a DC voltage between +or-ve 3 to +or-ve 15. I have completed the testing for positive DC output part, but I ...
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2
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1k
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How to design capacitance value for a given full wave rectifier [duplicate]
I have been searching for design equations for 5v regulated power supply but unable to figure it out. Please check the below circuit diagram
Could anyone explain me why 470uf ? why not 2uf? how can ...
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2
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2k
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7809 Linear Voltage Regulator Outputs in Series
I'm building a linear power supply that converts 120VAC mains voltage into multiple 9VDC, isolated outputs. I'm using this transformer that has the proper primary winding and 8 secondaries that I'll ...
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1
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3
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768
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Is a full-wave rectifier really required with a 7810 regulator?
I'm possessed of a 12-0-12 500mA transformer.
To supply a stable 10V, I seek to connect a bridge rectifier, roughly filtered with a 1000uF/50V electrolytic capacitor and a 7810.
Is a bridge, or ...
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2
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1
answer
415
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Light Organ -- Need help with LED grid
I'm building a light organ for a school project.
I've got a crossover to separate the frequencies, now I need to make an LED grid.
The input will be an constantly changing analog signal (whose ...
user40244
7
votes
5
answers
21k
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Transformers vs. voltage regulators
I'll start by saying that I'm self-taught in electronics, and tend to ask a lot of questions because I don't know NOT to ask them. This is one of those questions.
Consider: I have 120VAC and need ...
- 3,502
4
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1
answer
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Bridge rectifier circuit
The full wave bridge rectifier shown provides a DC output voltage of +/- 15 volts on which 1V peak to peak ripple is allowed. The supply should be capable of providing 1A DC current to its load ...
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2
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5k
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Calculations for a linear power supply
I've missed some classes and I'm struggling to do this. I need to "design a linear power supply with 12v output, with simple series regulator, providing a 2A current from 220V AC (60Hz)". I don't ...
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1
answer
1k
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Connecting several power regulators to a single voltage input
I am trying to make a power source to feed the following:
3x DC motors, that need to work under changeable voltage; not
supposed to operate over 2A RS385-ST
1x Servomotor 12V not over 1.5A
2x 5V ...
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1
answer
500
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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 ...
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3
votes
1
answer
1k
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Dual Rectified 12V 5V Tapped Power Supply Safe?
Is the following regulator valid, safe and efficient?
The transformer is a dual 7V output toroidal. So B1 is supposed to rectify out 14v and B2 taps the "center" to produce 7V.
INAE and I'...
- 1,461
9
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2
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6k
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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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29
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6
answers
26k
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How to convert AC to DC
I am designing a circuit that needs to output 5VDC @ 1A. I'm trying to use a wall transformer to step the voltage down to 12VAC. The next step is the diode bridge and ripple capacitor.
The ripple ...
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