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.

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68 views

DC-to-DC voltage booster mosfet heat problem

I'm tying to understand boost and buck converter designs. Recently I made a prototype of a simple boost converter, used this as a reference. Used parts are as follows: Transistor - IRF3205 Diode - ...
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1answer
50 views

Solar Panel Boost converter (40v to 100V)

My project is to deliver the output of 200w solar panel (40v,1.5A)- very low because I am using lamps instead of the sun- to a load at a voltage level of 100v, after implementing the design of my ...
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1answer
48 views

Boost converter for PV

So my two PV panels giving me an output of 40v, 1.5A. I am sensing both current and voltage of the PV output to give an MPPT duty cycle pulse. I want to boost the 40VDC to at least 400VDC and ...
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67 views

How do I convert 50Hz AC to 60Hz AC using a cyclo-converter?

I want to design a 3 phase cyclo-converter to run a 7.5kW induction motor. The input to the cyclo-converter is 50Hz AC and the output of the cyclo-converter should be 60Hz AC. What are the specific ...
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57 views

Charge pump configuration

Can anyone please explain the charge pump config. in this circuit. I am having a hard time figuring out what the diodes are used for, and I am not sure I fully understand the caps config. either. ...
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53 views

Circuit with “output” resistance as a linear function of “input” resistance

TLDR: How do I make a 6.8kΩ to 20.0kΩ potentiometer look like a 10.5Ω to 19.7kΩ potentiometer when presented with 3.3 volts? I'd like to make a mod for a MIDI controller. Through some probing I ...
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71 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?
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60 views

Step up converters DC or AC?

The wikipedia article on Step up converters says A boost converter (step-up converter) is a DC-to-DC power converter with an output voltage greater than its input voltage. However if I look at ...
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60 views

dc245a-a no output

i need help to get output from dc245a-a (ltc1668) board.i interface it with DE1 SOC board. I did following steps but in vain input digital voltages at dac pins from DE1 SOC board yes ref voltage ...
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50 views

Should I drive control lines of an IC at voltages higher than VCC

I am designing a circuit that will be running from a single cell LiPo battery. The battery will provide the input voltage to a boost converter that will output 5V, which will power a microcontroller. ...
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59 views

220v 60hz to 220v 120hz Converter

I have this problem that I need a 120hz power supply whit 220 Volts for my project. Does any one have any suggestion about haw to doing it or help me whit some schematics like a converter that I can ...
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3answers
71 views

Consume 12v to 5v converter

I am not a genius in eletronics but I know some information about converting 12v to 5v. There are different devices that can do these stuff like linear or switching converter, and I read that ...
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1answer
97 views

AVR USB to Serial Converter; Quick Question

I have a TI86 calculator that I've had for over 7 years now. Well I'm letting a lady friend on mine borrow it, and I was going to load it up with some apps for her. And the tradeoff is happening this ...
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2answers
87 views

Is it possible to convert SPI to UART without a microcontroller?

I was wondering about converting SPI to UART only in that direction, not the other way around, without using any microcontroller or bridge. If synchronous can be seen as a particular case of ...
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34 views

Optoisolated Feedback Pin Operation

In the case of galvanically isolated AC to DC converters, a controller IC is used to regulate the output voltage of the converter. The feedback pin is fed a signal from an optoisolator driven by the ...
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53 views

Which current ripple equation should I use? (Boost converter)

I am designing a boost converter for a microgrid as an university project. It is supposed to interface a 2.4kW 120V solar array (using MPPT) with a 380V DC bus. There will be other sources and loads ...
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84 views

Parsing Raw ADC Data into Voltage Levels

I'm collecting single-tone test data on the ADC12J4000EVM using the TSW14J56EVM and the High Speed Data Converter (HSDC) Pro software and ADC12J4000EVM GUI. I am trying to capture raw time domain data ...
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35 views

How can I properly control the CS and R/W inputs of the DAC7821 Digital to Analog Converter?

I am using DAC7821 in unipolar mode. The datasheet gives specific timing requirements for D/A conversion as seen below: I simply ignored this information and applied the same clock signal (1 MHz) ...
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45 views

Single-Phase to Three Phase Cycloconverter

When my classmate report about cycloconverters. He discussed about different classifications and types of cycloconverters. He also discussed how Single-phase to Single-Phase Cycloconverters operate. ...
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1answer
45 views

can an ammeter damage zeners

So I got this small circuit that plugs to the mains as power source. as for its DC converter, it's one of those transformer-less ones that drops the voltage with a resistors and filters before ...
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2answers
55 views

Inherent sample and hold in a comparator?

I have been reading up why a flash ADC does not (theoretically) need a sample and hold circuit. I have learned that this is because the comparators have an inherent sample and hold property, but I can ...
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1answer
93 views

DC/DC converter/eFuse maximum output capacitance

I have some doubts about the design of this DC/DC converter circuit/PCB circuit: On the left side there is a 400V to 12V DC/DC converter (Vicorpower DC/DC Mini, 300W). The maximum output ...
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3answers
113 views

Simple RS232 to 8 bit Parallel circuit

I want to make a simple rs232 to parallel (8 bit) converter. I would like the input to 1 wire and the output can just be 8 bit with no strobes etc. and run at high speeds (ideally up to 1Mbps, put ...
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1answer
97 views

Buck converter design problem/confusion

I have problem with designing buck converter. I have tried to design it by using instructions from this site: Buck converter And here are my parameters: V input - 72V max V output - 12 V ...
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34 views

buck boost and exciting synchronous generator

I have a Buck Boost converter for exciting a synchronous generator. the thing is that there is a load in the buck boost converter as shown in Figure 1 , everything is working good. what i want to do ...
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2answers
94 views

2.8V UART to 5V MCU - how?

I'm trying to connect ZTE MG2639 to 5V AVR (or USB<->RS232). This module is using 2.8V at IO. How can I do that? Normal voltage divider? And how to check if communication is OK in Putty? Just type ...
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65 views

Stacking DC-DC converters

I'm currently building a high-power LED driver to be powered from a 2.7V supercapacitor. To this end, I'm seeking a solution with high current rating (up to 3A, so ideally a controller IC rather than ...
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139 views

Arduino Output to 24V logic

We are testing out some analog sensors, and we need to send a 24V trigger (maximum 15mA) to a PLC from an arduino. I have seen some designs using a MOSFET to make a bidirectional logic converter, but ...
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1answer
177 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 ...
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1answer
67 views

How electric signal is converted to more powerful electricity

First a little disclaimer: I've a newbie question which is simple, but somehow I can't explain it to myself. I'm interested in how electrical signals can trigger let's say a movement, which requires ...
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1answer
156 views

Need help with a R-2R DAC Circuit

I am trying to simulate a 4-bit DAC circuit using a R-2R resistor ladder. I am using a 741 op-amp. I selected the R value as 10k and calculated the value of Rf using the equation given on this page - ...
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2answers
45 views

looking for a smart way to compare DCDC Converter IC [closed]

I'm looking for a quick and easy way to compare DCDC boost Converter IC, to all or most manufacturers. Does anyone know tools, sheets or charts? Thanks!
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100 views

Current calculations in boost converter

Hi I am designing a 30W dc-dc stepup converter(15V - 30V) with 50 KHz gate pulse with fixed duty cycle of 0.5. Calculation shows that a 1mH inductor is required for this if i am considering 15% ...
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31 views

How a freewheeling diode in semiconvertor reduces the reactive power demand of the convertor and thus improves power factor?

I can understand that FWD will help in giving reactive power of load inductance to load itself instead of supplying back to the source. But why convertor will draw less reative power ?
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80 views

Step up transformer for low frequency AC with DC offset

What is the best way to step-up a low frequency voltage with a DC offset? I have the following signal coming from a function generator: \begin{equation} V_f(t)=8 Sin(2\pi f t+\phi) + 4 ...
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82 views

Current steering DAC

I want to design current steering DAC with current mirror sources binary weighted and an op amp to convert the current from the current sources to voltage corresponding to the input current. I find ...
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1answer
214 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 ...
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41 views

LM2587T-ADJ Boost Converter Equations

I'm designing a voltage boost circuit that takes 12V on the input and 21V 1.5A on the output. I decided to go with the LM2587T-ADJ since it was fairly cheap and I could get 21V and 1.5A out. But ...
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1answer
131 views

What is the significance of 8 bits in the context of an ADC0808?

ADC0808 is an 8 bit analog to digital converter. What is the significance of 8 bit? What does it represent? Which capability of IC does it represent?
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36 views

Convert a non-isolated converter to an isolated converter

Is there a way to convert a non-isolated converter(such as R-78C5.0-1.0) to an isolated converter.
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185 views

Inverting (Buck-boost) converter polarity problem

I have trouble understanding something in the circuit below. It is inverting converter, seems quite easy, but the part I don't get is when the switch is OFF we have forward-biased diode, i.e. plus on ...
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1answer
55 views

DC/DC Converter doesn't convert to 3.3V

I have a 5V DC input. I want to convert it into 3.3V DC. I'm trying to use VBT1-S5-S3.3-SMT DC/DC converter. I'm connecting my input to second pin of the converter. But it doesn't give 3.3V DC as ...
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179 views

How do you choose a diode for a 5v to 3.3v clamping circuit

I have a logic input that is 3.3v and I want to be able to allow it to interface with either 3.3v or 5v input signals w/o worrying about it being damaged. I would like to use a resistor with a ...
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1answer
37 views

Harmonic distortion and Nyquist rate (Spurs above the Nyquist rate of a DAC)

I have been reading an article during the past few days for a project I am doing and I've come across a point that bugs me out. It is about improving the spurious free dynamic range (SFDR) of DACs. ...
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4answers
2k views

220V AC to 12V DC transformerless and main isolated converter?

I am trying to build a 220/12V AC/DC max 100mA converter without transformer. I tried so much and burned some circuits. at the end I decide to write here. I searched but couldn't find and answered ...
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1answer
67 views

Having Two AC-DC converters in series

I have two AC to DC full wave rectifier converters and want them to be in series to increase the voltage. The circuit is basically a generator going into a wave rectifier then a capacitor and resistor ...
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2answers
718 views

Converting a 9v Battery powered Device to a 9v dc power supply [duplicate]

I have an old Vivanco MX300 mixer which runs of a 9v battery. I have it in the same place and it's an inconvenience having it run by batteries. Could I use an old AC/DC adapter that would supply 9v ...
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1answer
57 views

Converting a 10A supply into a 16A appliance [closed]

Is it possible to insert a converter between regular 10A 240V mains supply that would be capable of running a tool rated at 16A, 3500W? Obviously, the tool won't run to it's full capacity but could ...
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3answers
432 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 ...
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1answer
74 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, ...