Tagged Questions

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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89 views

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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2answers
80 views

Design help for my 1A variable power supply

In a 1A Variable Power Supply circuit given below is it possible to use a 2A transformer and 1A bridge diodes.
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1answer
52 views

Is it possible to calculate the load resistance in a full bridge rectifier when given only power, inductance, and input voltage?

I'm given a full bridge rectifier circuit with values for power, industance, and RMS input voltage: [P = 380 W, L = 85 uH, Vs = 115 V]. The question states to 'select' output resistance for a ...
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1answer
51 views

Selecting diodes for HV full bridge rectifier

I'm using a current-fed Royer self resonant circuit to generate 1kV DC output voltage. The transformer is producing a sine wave of 100kHz/2kVpp (Cap-Royer = 100nF). At the output of the transformer I ...
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3answers
100 views

Output of Inverting opamp with single supply

I have the following circuit I'm looking into (it's actually a section of a larger design) simulate this circuit – Schematic created using CircuitLab V1 has an input range of 0 to 4V. ...
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1answer
100 views

Tuning LED circuit so LED turns on at specific voltage

I am attempting to add a signal activity LED to my dummy load box. I have constructed the following circuit and so far it does what it is supposed to (lights an LED with signal applied and does not ...
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1answer
48 views

Fullwave rectifier theory

Why is it that in full wave rectifiers do you divide the secondary coil by half as stated in this book: (Source) What concept am I missing?
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3answers
125 views

Precision half wave rectifier

How does a precision half wave rectifier work? The one with a single diode. When the input goes positive, the output of the op-amp is a large positive signal which turns on the diode and completes ...
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1answer
57 views

Transfer function for six-pulse controlled rectifier

I need to determine the transfer function for a six-pulse bridge rectifier, implemented with thyristors. More precisely, I need to determine the relationship between the output voltage (pulse) and ...
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2answers
102 views

How to replace the rectangle(DIP) bridge rectifier with round one.

I want to make an AC dimmer and the circuit diagram from the instructables uses a bridge rectifier which is in DIP package and rectangle in shape and the rectifier which I have is round one, so how ...
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1answer
36 views

Center Tapped Full Wave Rectifier

What is the formula for Vdc of a Center tapped full wave rectifier? Is it 0.636*Vac - Vk (where Vk is the potential drop across a single diode. Assume both diodes ...
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2answers
68 views

Convert a ringing telephone voltage of 90V AC to 3.3V 1000mAh DC current so that it only triggers when the telephone is ringing?

How can I convert and step down a ringing telephone voltage of 90VAC current to 3.3V 1000mAh DC current so that it only triggers when the telephone is ringing? Bridge rectifier? Inductor? Step Down ...
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2answers
1k views

AC to DC without transformer. How does this thing work?

I disassembled a Chinese-made flashlight and found they use just capacitors to bring down the voltage instead of a transformer. They are using it to charge small lead-acid battery. My question is how ...
2
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1answer
72 views

Remove DC offset and rectify

I'm using ACS712 hall effect current sensor to detect presence of current in the power line of a remote device. I don't need exact current value but rather just want to know if it's above certain ...
3
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2answers
163 views

Equal rectifier capacitor

Capacity of the capacitor in circuit below is equal: What difference is there between the circuits? Which one is better? Can i made equal the capacitor with the capacitors in series? Which one is ...
1
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3answers
131 views

How do capacitors help in smoothing potential difference from a full wave bridge rectifier?

Let me establish some facts I have understood by myself: The polarity of resistor does not change, as the current from A.C source flowing through does not change direction. The D.C potential ...
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2answers
164 views

Differences in full wave rectifiers

I have looked up a few things regarding rectifiers but there is still something that bothers me: If we put aside half-wave rectifiers or things like tripler and stuff, there is apparently two kinds ...
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1answer
81 views

Single Phase Diode Bridge Rectifier - Inductive Smoothing Question

So I don't understand how the answer is 2.124 volt-seconds when if you put the equation through a calculator it comes out as -0.174. Is there an additional mathematical step to do on the cosines in ...
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1answer
74 views

Differences between controlled rectifier circuits

I'm trying to determine the pros/cons/applications of a few similar rectifier circuits. In particular, these two: My questions are these: I understand that the second one eliminates the ...
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2answers
82 views

Output voltage of bridge rectifier

I'm trying to figure out why the output voltage waveform of this circuit would not include a DC offset of E. My understanding is that D1 becomes forward biased when Vs > E, and so that is when it ...
1
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2answers
161 views

Burning rectifier capacitor 220V input

I have built the following circuit for 1 watt power LED lamp. The capacitor C4 (220uf 50v) was heating after a few seconds then it burnt. What is wrong with the circuit? I can remove C4 but reducing ...
0
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1answer
89 views

3 Phase Motor Rectifier

I have a Turnigy Rotomax 50cc engine and I am trying to rectify it. I don't know whether it has delta or a wye winding style but I suspect that it is delta(Left Picture). This is what I have so far: ...
0
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1answer
181 views

Current rating of center-tapped full wave rectifier vs full wave bridge rectifier

I was going through the Art of Electronics (Horowitz & Hill) and in the section on center-tapped full wave rectifiers (pg.47) it says: "The output voltage is half what you get if you use a ...
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2answers
287 views

1n4007 Bridge Rectifier at 220 Volts AC?

So, I just started getting into electronics, and I have built a bridge rectifier using the 1N4007 diodes. So far I have been using this rectifier with a 24 volts step down transformer, but now I need ...
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2answers
162 views

Center-tapped Full Wave Bridge Rectifier

I'm designing a high-voltage power supply for a plasma experiment. I have a center-tapped ignition transformer (50:1) that I'm using to step up the voltage from 120VAC to 6kVAC and then using a full ...
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3answers
130 views

Stable power for LED from 5.5 to 7.5V AC

About a year ago I posed the question "Making 12V DC from 6V AC". Since the conversion from AC was going to be problematic (for me), I tackled the tail/brake light first, because working with the 6V ...
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3answers
142 views

DC or (AC + DC) coming out of a full wave rectifier

DC or (AC + DC) coming out of a full wave rectifier Is there a truly correct answer to this? Considering the representation as a waveform I would say its an AC wave form offset by some DC amount. ...
13
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7answers
1k views

Why are rectifiers-inverters used to drive AC motors instead of using the rectified current to drive DC motors?

I understand the advantages of using a rectifier-inverter system to drive an AC motor instead of simply plugging it into mains power, as it allows much better control of its speed and performance; but ...
1
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0answers
57 views

How to add a desirable phase shift in the input from 3-phase ac mains?

I want to build a 12 pulse rectifier circuit. I know delta-wye or wye-delta transformers can be used to add phase shifts equal to the multiples of 30, but I don't want to use transformers. Is there ...
0
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2answers
483 views

Help with Piezo conditioning circuit schematic

I have the below schematic that uses a piezo sensor as input and relays that information to an Arduino board for processing. The schematic came from a few folks over at MIT that built a ping pong ...
1
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3answers
266 views

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 ...
1
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1answer
170 views

Max size smoothing capacitor without melting the rectifier

I am currently making a tube amplifier for a school project. I started out with a finished design, but have changed a lot and need some guidance as a result. I am currently using a full wave ...
0
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2answers
193 views

Fast rectifier diodes in parallel at SMPS

I'm trying to build a 35 V @ 10 A SMPS. I don't have 15A diode to rectify the transformer output. Can I use two BYW29 in parallel? They are rated at 8A. I know that when diodes are in parallel, the ...
3
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1answer
151 views

Wiring a 24VAC Vacuum Pump to 220VAC Mains Supply - Need Help

perhaps you can help me understand what I need to do. I have a MEDO VP0125-C001, 50/60Hz, 24VAC, 19/15W Vacuum Piston Pump, with a black wire and a white wire. For all intents and purposes it is ...
0
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0answers
81 views

Changing synchronous rectifier's output voltage by varying phase

I'm going to design a voltage converter with regulated three-phase 220V 50Hz output. It will consist of mains rectifier, filter (with 310V DC output), a self-oscillating high-frequency inverter, a ...
1
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1answer
109 views

Is the circuit right?

simulate this circuit – Schematic created using CircuitLab I have found this questions and the circuit seems worong to me because the output terminal hasn't end point. If we add ...
2
votes
2answers
738 views

Average output voltage of a fully controlled full wave rectifier

What is the average voltage for a fully controlled bridge rectifier with firing angle \$\alpha\$ ? In a lot of web resources it is said to be: $$\frac{V_{max}}{\pi} (1+ cos(\alpha))$$ For example ...
1
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3answers
180 views

Full-bridge rectifier not working as expected

Im trying to create a full bridge rectifier from a step-down voltage source. The circuit is as follows: simulate this circuit – Schematic created using CircuitLab The problem is that I'm ...
2
votes
3answers
115 views

Quick and dirty LED power from AC

I have some extra 1n4007 diodes, and was wondering whether, instead of using a power supply to drop the voltage, could I could power LEDs by just making a full wave rectifier, Using a capacitor to ...
0
votes
1answer
299 views

Precision rectifier using a low-power single supply rail to rail op amp

Rectifying a very low voltage signal turns out to be very hard. (for me) I've tried this a few different ways without good results. I'm looking for a reasonable simple solution that performs well ...
2
votes
1answer
97 views

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 ...
0
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2answers
68 views

Inverted signal in biopotential circuit

Im building an sEMG circuit and am a bit confused on how to change the signal back to non inverted before the output.The signal goes -> amplifier (x16)-> high pass filter -> variable amplifier ...
1
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1answer
397 views

Does a bridge rectifier care that much for AC frequency?

As I understand it, a bridge rectifier is a set of diodes that play a trick of logic that keeps the polarity positive. So, within the context of a household DC transformer does it matter what the ...
2
votes
2answers
229 views

Peak output current of a Full-Wave Bridge Peak Rectifier

I am attempting to design the first section of my power supply. In this case, I am going through my calculations for the Rectifier section. I am simulating my circuit with PSpice and while most of my ...
0
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0answers
74 views

Why does this voltage error amplifier output always reach its saturation voltage?

Why does the voltage output of both amplifier (Vm1 and Vm2 as shown in picture) always reach its saturation voltage?
0
votes
1answer
95 views

Middle-Tapped Transformer Full-Wave Rectifier Vs. Full-Wave Bridge Rectifier

In terms of output voltage, which one of these would be best? Coming into this, I would have to say the center-tapped transformer full-wave rectifier would allow the most accurate output voltage ...
3
votes
3answers
212 views

Precision Rectifier Help

I'm building a "precision rectifier" using an op amp and some diodes. The schematic is attached. On a breadboard, this circuit behaves as expected, producing a clean, rectified sine wave. When I ...
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2answers
82 views

Rms value of rectified output from a half wave rectifier

The rms value of an alternating quantity which is the input to a half wave rectifier is Imax divided by square root of two. Then the rms value of output should be IMAX by 2*sqrt two. But it Isht ...
1
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2answers
190 views

How does this power supply (resistor/capacitor) divider filter work? [duplicate]

I've been looking at various valve guitar amplifier circuits and in specific, the power supply section. I've been seeing a particular circuit that's repeating itself here and there in the power ...
0
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2answers
83 views

Potentiometer Ripple under load

I have the following circuit with a 10k 0.5w trim potentiometer. simulate this circuit – Schematic created using CircuitLab The voltage after the bridge rectifier is maintained at ~8.6 ...