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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52 views

How to make Current to Voltage converter [duplicate]

I am working on level sensor which give output of 4-20 mA. I have to feed output of level sensor to an ADC of a micro-controller, to do so I have to convert it from current to voltage.Voltage range ...
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1answer
47 views

Boost converter with 2A load

I'm trying to put together a boost converter to take a 11-14.4v input and boost it to ~17v with a max current of 2A. Most of my designs (made either by calculations done by me or a calculator tool ...
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1answer
117 views

LED indicator for DC voltage

I am planning to using a buck / boost converter to run a DSLR camera from my USB powerbank AND other power sources. For that module I want to build with the buck / boost converter, I need a simple LED ...
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204 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 ...
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2answers
31 views

Choice between Pseudo-Differential Unipolar and Pseudo-Differential Bipolar ADC Input

While reading about Pseudo-Differential Inputs for ADCs, I came across the document below from LT. Link : http://cds.linear.com/docs/en/product-selector-card/2PB_sarinputtypesfb.pdf Below are copied ...
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68 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 ...
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2answers
53 views

Switching converter current mode control - load disconnect problem

I'm building LED driver based on current mode control buck converter. My question is quit general. If load is disconnected then output capacitor voltage shoots up. If load is reconnected it gets ...
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1answer
34 views

Acs712 current sensor ic interfacing with ade7858(energy metering ic)

I am trying to interface Acs712 current sensor IC with an energy metering Ic(Ade7858),there are two problems am currently facing. 1) The energy metering Ic takes in bipolar input (± 0.5 V) which is ...
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3answers
48 views

The role of reference voltage in buck converters?

I asked a question here which made it quite clear that it's probably not a good start to make something that I plug directly into the mains. Instead, I've decided to build a low-voltage buck ...
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66 views

Does anyone know why DC-DC converter have noise

I am running an issue that my custom board has noise come from DC-DC converter after running a while. I used V78W-500 as the DC-DC converter and already replaced a new one. Except noise, the voltage ...
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2answers
112 views

dc to ac inverter circuit

I want to design the following inverter circuit, I know the general working of it, but I need some details. in the gates of the FET transistors used in H Bridge there is a design contain 4 diodes 2 ...
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1answer
26 views

Periodic Steady State voltage Buck Converter

What does Periodic Steady state mean with regard to a Buck Converter ? Does it mean the normal operation ? Also, From what I read, the net change in the capacitor voltage in the buck converter is ...
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48 views

Basic MOSFET question

I am using a P-Channel MOSFET to build a buck converter and change 12VDC, 2A (from a 12V battery) to 5VDC, 2A (for cell phone charging), should I use a MOSFET rated for 20V, 2A or -20V, -2A? I am new ...
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2answers
72 views

Possible to convert dead 18v battery into wall-plug? [duplicate]

Not sure how better to title this... But basically, I want to try to convert one of my old ryobi 18v batteries into a wall plug. I want to strip the guts of the battery, attach some components and a ...
0
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1answer
71 views

Does a step-up power converter cause move volts but less amps? [closed]

I have a 5v 10,400mAH battery. I'm wondering if it would be possible to power my laptop charger with this. The laptop charger is 20v 3.25a. Is this possible? If I use a step-up voltage converter, ...
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1answer
93 views

Buck-boost converter dropping source voltage

I have two solar panels connected in series, and I'm using them to charge a phone. Together they provide about 7 V when I connect their leads to a multimeter or a basic circuit (i.e. Resistors/etc.). ...
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1answer
42 views

boost converter load problem

I am designing a boost converter for wind turbin, with load 12Vdc, 2A. Before I install my boost converter on my windturbin, I putt a test to make sure it work properly. So I use this circuit to ...
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1answer
60 views

12V 345 Amp lawn mower battery to a 12V 10 amp motor?

I have a 12v scissor jack that is meant to plug in to a car cigarette lighter, which I believe is around 10 amps. However, I want to hook this jack directly up to a 12V battery, which is rated at ...
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1answer
79 views

Solar boost converter unstability

My design of a boost converter is the following Input: 40V/1.5A Output: 100v/0.62A Inductance used: 3.15mH Capacitance used: 220uF (rated 200V) diode switch used: IRF830 (rated Vds=500v) ...
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1answer
172 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
64 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
64 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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1answer
104 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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66 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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68 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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106 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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123 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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55 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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1answer
73 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
90 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
160 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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112 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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1answer
39 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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65 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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1answer
124 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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1answer
38 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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1answer
72 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
47 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
59 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
119 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
138 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 ...
2
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1answer
107 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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51 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 ...
2
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2answers
118 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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70 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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195 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 ...
2
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1answer
255 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
68 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
200 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 - ...