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.

477 questions
175k 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.
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 ...
3k 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 ...
1k views

In digital systems do we discretize both time and magnitude or only time?

In studies of Digital Circuits or Digital Electronics or Digital Systems, the very first step is to convert an Analog signal / Analog system into a Digital Signal / System. In this process of ...
2k views

What is Namur how does it work?

I found a TTL converter box made custom made many years ago. It says Namur_to_TTL converter on it. What is Namur? I googled but couldn't find a clear explanation.
6k views

DC-DC Boost converter in Parallel

I'm trying to power a 12V 1A device with 1 cell lipo battery. At 12W, the lipo would need to provide 3.24A (assuming no power loss) to step up the voltage to 12V and providing 1A. However the DC-DC ...
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 ...
3k views

Recommendation of a USB-to-RS-232 chip for an industrial environment

I have bought a device which has an ATmega microcontroller and an FTDI chip which connects to a computer through USB. The FTDI is used only as an RS-232-to-USB adapter. My problem is that this device ...
248 views

Where are Ćuk converters

According to "the art of electronics" (p 651) and other internet sources, the ćuk switch converter has the most desirable properties: continuous input and output current waveforms, boosting and ...
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 ...
253 views

I'm planning on using an AC/DC power adaptor to power an Arduino and various devices. Before actually powering up the Arduino with the adaptor I wanted to play with the AC/DC adaptor, as it has ...
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?...
1k views

Calculating values for compensation network (boost converter RC+C network)

I'm trying to build a boost converter with current mode PWM control, but I'm stuck at selecting capacitor and resistor values for compensation. I'm using a LT1619 as the controller IC: simulate this ...
230 views

Purpose of this oscillator (74HCT14-based) on RS-232 to RS-485 converter?

I am reverse engineering an RS-232 to RS-485 converter to understand how it works. I have attached the schematic that I reverse-engineered from the PCB (apologies for the hand-drawn schematic). I've ...
708 views

LM2596 and other DC-DC converters why oscillate if the output capacitor ESR value is too low?

I would like to use LM2596 converter. Datasheet says: 'If the selected capacitor's ESR is extremely low, there is a possibility of an unstable feedback loop, resulting in an oscillation at the output.'...
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?
2k views

Operation of a Buck Converter

I hate to be asking this, but I just don't understand the operation. I've been reading various resources, mostly this: http://services.eng.uts.edu.au/~venkat/pe_html/ch07s1/ch07s1p1.htm though. From ...
944 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 ...
2k views

Power an ornament via christmas tree light bulb socket

My dad owns a really neat star trek Christmas tree ornament that plugs into a standard bulb socket in a Christmas tree light string. It has a button that, when pushed, causes Spock to say a brief ...
2k views

Behavior of Boost and Buck Converters

I have a couple questions about boost and buck converters. First, do they try to hold the output voltage constant, or do they alter the input voltage by a constant factor? For example, if I change ...
604 views

Mathematics of Cap Charging Circuit

To teach myself the basics of power electronics I've been trying to build a circuit, which charges up a capacitor to a voltage higher than the input voltage. Basically it's a boost converter with no ...
10k views

How to Calculate Appropriate R-2R D/A Converter Resistor Values?

I am trying to make a 4-bit R-2R D/A Converter where a +5V signal on D3 would output -5V, a +5V on D2 would output -2.5V, etc. How would the resistor values for R/2R be calculated?
106 views

Is it possible to make a multi-display adapter as an independent project?

I've been looking at the Matrox DualHead2Go, which is essentially the best/easiest way to go about using dual monitors for a MacBook Pro. Some people suggest using a USB to VGA or HDMI - but obviously ...
195 views

What's an efficient way to get below the standard 1.25V on buck converters?

So, I purchased a buck converter which was advertised to be able to range down to 0.8V but, as you can probably guess, it only goes down to 1.25V which I understand is the reference voltage for the ...
5k views

How could I build a headphone stereo to mono converter?

I have a friend who is permanently deaf in one ear but has normal hearing ability in his other ear. When he listens to music with headphones or earbuds, he can't hear one of the channels which ...
2k views

SFP pin requirement

I have a question regarding SFP pin requirements. The SFP pin descriptions can be found in the standard document found here. I'm currently designing a high speed LED transmitter and PIN-TIA receiver ...
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 ...
4k views

What is reference voltage in a D/A converter

When I searched on the internet what I got as an answer for the above question is that the reference voltage means the highest voltage tha D/A can output. But my lecturer at college did a calculation ...
102 views

Buck, Boost..etc Is there always an IC for that?

First of all I am still in school so perhaps I have not been exposed to material that may answer this question for me. I have recently become interested in power electronics. I have purchased a book ...
239 views

What type of controller is this?

In many simple microcontroller power controller applications, I see controllers that work in an "increment/decrement" on error with hysteresis implemented e.g. ...
3k views

What would happen if you connect a solar panel to a buck-boost converter?

What would happen if you connect a solar panel with the following characteristics: Max Power:3.5W Voltage: 6V Open Voltage: 7.2V To a buck-boost converter that convert an input voltage in the ...
1k views

What dc-dc topology to use for a 300W step-up converter?

I am asked to design a dc-dc converter with the following specifications: Vin=24V(2 lead-acid batteries in series), Vout=300V and Iout=1A. My initial choice of topology was the boost converter. ...
5k views

RGBHV (VGA) to YPbPr Converter and Waveforms?

Purely for hobby, I am working on an RGBHV (VGA) to YPbPr (Component) converter circuit for old games consoles modified to output RGBHV on a VGA cable. From the game consoles, the RGB signal is taken ...
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 ...
394 views

What's the difference between the LM2917 and the LM2917-N?

The schematic I'm looking at says to use an LM2917. The specs from the TI site use both LM2917 and LM2917-N and the shop on ebay uses both names too. http://www.ebay.com/itm/like/270864373784?lpid=...
127 views

What is the difference between the LT1054 from TI & the LT1054 from Linear Technologies, other than price

The following has me puzzled: The specifications on the datasheets of the LT1054 from Texas Instruments appear the same to me as those of the LT1054 from Linear Technologies. In Europe the TI LT1054'...
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 ...
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 ...
12k views

3.3V <-> 24V interface

I need to interface an ARM µC (BeagleBone Black) with a 24VDC system. 24VDC sensors and 24VDC actuators should be connected to the BeagleBone Black. I am wondered how to do this. I have found a ...
365 views

For 3.5" mini stereo (TRS) to RCA stero cable, are any passive/active components used?

Are any passive (or active - unlikely) components used in the 3.5mm mini stereo headphone (TRS) plug to RCA audio plug converter cables, such as this one ? Asking because, during a quick search I ...
163 views

PWM controlled Input Voltage/Current regulated Converter (for solar panel)

(newbie question) Briefly: In a converter (let's say DC-DC), I want to dictate a voltage to the output of solar panel, on the fly. As I look around online, for example in some IEEE papers, Buck or ...
577 views

Is it possible for buck boost converter to output -48V with +12V input?

I have a school task for creating a Buck Boost converter that takes 12V and outputs -48V. I have done some digging and couldn't ...
163 views

Advice and critical remarks regarding the manufacturing of a DC-DC step-down converter

I'm in the third year of my electrical engineering major and I want to take things a bit further than the usual analogue electronic circuits I've studied thus far by making a DC-DC step down converter ...
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, ...
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 ...
30 views

2k views

push pull drain severe ringing

Background: I am trying to make a push pull dc-dc converter from 12vdc to 400vdc for an inverter with a center tapped transformer connected to battery of 12vdc. The MOSFET circuit is as follows As ...
2k views

I'm currently learning about Analogue to Digital Converters. From what I understand, aliasing occurs if the input signal being sampled has power above the "Nyquist frequency" of the ADC(Sampling ...