Questions tagged [converter]

A circuit that converts a signal from one form to another. Analog to digital, Digital to analog, Voltage to current, Current to voltage etc. The key to understanding is the transformational properties of the circuit as opposed to just amplification or buffering.

44
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7answers
176k views

230V AC to 5V DC converter, lossless

Is there any IC which converts 230V AC to 5V DC? As lossless as possible. I want to connect my microcontroller to an ordinary electrical socket and I don't have enough space available. Thanks.
0
votes
2answers
2k views

How to design a boost converter? And how to specify the inductor and capacitor values?

I want to design a boost converter with input of 48V and need to get to a voltage of 100V. How to select the inductor and capacitor values in it?
6
votes
3answers
4k views

4-20mA to 0-3V3 Converter

Looking for a simple design to convert from 4-20mA signals to 0-3V3, I'm thinkin about configuration shown at picture attached. And I would like to discuss its suitability. It is based on: - A ...
2
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1answer
5k views

ICs that convert an AC signal into its true rms value

I need to convert the instantaneous voltage output from my current transducer to a true RMS voltage output. Can anybody please suggest an IC that can perform this function.
4
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1answer
6k views

Arduino Boost Converter. Connecting load makes converter non functional

I am trying to build a DC-DC Buck-Boost Converter using this basic schematic and an Arduino with the analogWrite() function as my PWM generator. I only want to step up 2.4-3V to ~5V. If it's just the ...
3
votes
3answers
1k views

Transformless power supply without ground

I would like to make a transformerless power supply, I found some description on the Internet like this pdf provided by Microchip. My question is it is possible to use only the phase line(without ...
3
votes
1answer
422 views

Measuring precisely the efficiency of a power converter

I am trying to measure the efficiency of a DC/DC boost-converter in several operating points as precisely as possible. Right now I am measuring my input-voltage and output-voltage with a multimeter, ...
0
votes
2answers
124 views

Calculating the peak current of my boost converter

I am stuck while calculating the peak current in the boost converter through the inductor. Can you please check if I am right? Ipeak=(Max Voltage/ R2) = 18/1000=0.018. So, my peak current through ...
-1
votes
1answer
312 views

Transistor current control with collector feedback [duplicate]

In my last question, Transistor current control with positive feedback differential amplifier I made a mistake. The actual circuit seems like this I am beginner in linear electronics and I am very ...
-2
votes
2answers
138 views

Voltage divider, no power

I made a voltage divider using 2k4 and 4k7 resistors. If I check the voltage with the multimeter, the voltage is correctly converted from 5V to 3.3V however when connect a consumer(small electric ...
19
votes
3answers
4k views

Explain the logic of a 12 V to 9 V conversion

How does the below circuit work? I know what resistors, capacitors, and transistors do and have played with them on a microcontroller board, but am I trying to understand the logic of the circuit. I ...
5
votes
2answers
945 views

Buck converter operation

I have been reading about the buck converter and have also referred to the various online resources like here. In the above circuit, as I understand, when the switch closes, current starts to ...
3
votes
3answers
14k 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 ...
2
votes
2answers
447 views

Boost converter to 5V

I'm searching for a boost converter to convert up small voltage (min 0.5V / max 81mA) to 5V. (the smaller the better) Can you recommend a special type number?
6
votes
3answers
28k views

How can I convert a PNP to NPN transistor?

I have a circuit which requires a PNP transistor. I only have an NPN transistor. Is there a way to convert one to the other given that they have the same characteristics (apart from the npn/pnp part?...
3
votes
2answers
2k views

How do I make an LED turn on when my output reaches 5v?

I'm a hobbyist and pretty new to many of the components involved, so I hope you guys can help me here. I'm trying to keep the circuit as simple as possible. I made a small variable power supply with ...
2
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3answers
1k views

Boost Converter Output Voltage dependence

Does the output voltage depend on anything except for the Duty Cycle? Assuming no losses across switch, inductor and caps.
1
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2answers
3k views

Sensing weight with strain gauge, InAmp, ADC & Pi

I have an SEN-10245 sensor for weighing objects (essentially a strain gauge). The goal is to capture data with a Raspberry Pi, so the signal from the weight sensor needs to be amplified and then ran ...
1
vote
1answer
6k views

How to make sawtooth wave from square or triangular wave?

I know it is easy to convert a square wave to a triangular wave by an integrator. I know also that they can be made out of Harmonics but I don't know how to make a sawtooth wave form. Having a ...
0
votes
2answers
2k views

Signal to Noise ratio problem

A 200mv peak to peak sinusoidal signal is applied to an ideal 12 bit A/D converter, for which Vref(v p-p full scale) is 5v. Find signal to noise ratio. This is a problem worked out by one of my ...
0
votes
1answer
874 views

How to turn off DC-DC step-up converter to run on 3 AA batteries

simulate this circuit – Schematic created using CircuitLab I am using this step-up converter : DC-DC step-up converter with 3xAA batteries (input voltage for the circuit is ranging from 4.65v ...
7
votes
6answers
2k views

Extract 5W low voltage power from 3000W high voltage source

I have a solarpanel array that generates 600V, 5A (3kW). I want to create a small electronic unit to measure the DC current and voltage and transmit this wireless. For this I have an electronic board ...
5
votes
3answers
2k views

Understanding Boost Converter

Theres a very good explanation for the Boost Converter on Wikipedia. But it is a very mathematical explanation. How would you explain the Boost converter to a non Math person like me?
3
votes
3answers
659 views

Op amp picks up power rail oscillations from boost conveter

I've built a circuit which detects ambient audio through an electret microphone, amplifies the audio signal using a LM386 op amp (gain = 200), and then processes that audio information. The board is ...
2
votes
2answers
4k views

Not getting stable voltage output with DC-DC Buck Converter

Coming from a computer science background, I'm new to electronics and my first post here. I'm working on a hobby project with the intention of designing a PCB eventually and the first step is to ...
1
vote
0answers
398 views

Can I use a capacitive divider to run an AC/DC converter from a higher voltage than its rating?

Suppose I have an AC/DC converter rated to run from 120-240VAC, and I want to run it off 480 VAC. I think I should be able to put two capacitors in series as a voltage divider, and run the converter ...
1
vote
3answers
2k views

Will a 3V3 rated UART be damaged by applying 5V signals?

If I have a device specified for 3.3V operation and I connect a 5V level TTL signal to it ? Will it's UART ports be damaged or not ? I have a WiFi module and I want to know if its UART ports will ...
1
vote
3answers
3k views

How to make a boost converter circuit

I've seen multiple different explanations on boost converter circuits, these two specifically explaining in very intimate detail how they work, and on how to calculate certain values: How to design a ...
0
votes
3answers
582 views

How would I go about converting a change in capacitance into a voltage?

Just starting out with electronics here as a physics student- I appreciate the help! In a simple LCR circuit with a variable capacitor, how would I go about detecting the change in capacitance and ...
0
votes
1answer
184 views

Parallel 18650 battery pack voltage not stepping-up with Boost converter. Why?

I'm new here and I hope this is the right place to ask! I have assembled a 6P 18650 battery pack out using Samsung 25R cells, soldered altogether with Nickel strips, effectively giving me 3.7V 15Ah. ...
0
votes
1answer
803 views

Bipolar Voltage to Current Converter

I need a circuit or component which converts bipolar voltage to bipolar current. I have found the XTR111 from Texas Instruments and the 1B22 from Analog Devices. However, they only convert 0-10 V to 0-...
0
votes
2answers
3k views

voltage current converter by op amp circuit

I am trying to convert 5V to a constant current source for op amp I use AD822. for 250 ohm I use 180 ohm, so I should get a current of 28 mA. I verified when Rload = 0, 28 mA across negative terminal ...
0
votes
2answers
9k views

Negative to Positive Voltage Converter

Is there an easy circuit or IC that will convert negative voltage to positive voltage and retain the initial value? Context below. I am trying to add a volt meter to my power supply using some old ...
0
votes
1answer
152 views

flyback converter issue

When loading flyback converter with heavy load, waveforms are as expected. But with light load, waveforms are not as expected. What can be the reason ? Duty cycle is less than 50% so no slope ...
0
votes
2answers
73 views

Input current for boost converter

I am using this IC in boost converter configuration : boost converter It steps up the voltage from 16.5V to 23V. It drives a load current of 270mA. I need to calculate the input current of the ...
0
votes
1answer
291 views

Help me hack this speaker, where would I introduce DC voltage

I have a speaker that runs off of AC (there is a switching converter within the speaker) I'm attempting to convert it to battery power, From my understanding the speaker runs off of 5V (someone else ...
0
votes
3answers
2k views

Hot MOSFET DC-DC Boost Converter

What: I'm designing a DC-DC Boost converter for a solar panel maxmimum-power-point-tracker (MPPT). Setup: I'm using a TPS2819 MOSFET driver connected to a FQD16N25C N-MOSFET. The TPS2819 is driven ...