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.

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26 views

RS232 to RS485 converter for RS422 conversion purpose [closed]

I want to use RS232 to RS485 converter for RS422 to RS232 conversion , by connecting RS422 on the RS485 side. Is this a mistake ? Can you also exaplain if yes or no ?
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28 views

High Current Buck Converter with wide input voltage [closed]

I'm currently building a powerbank with PD outputs that are capable of outputting 5 amps at 20 volts, but my battery pack is 33.6V (8S Li-ion). I've managed to find a possible buck converter IC (...
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84 views

Unexpected results in voltage to current converter (simulation is Ok)

The circuit below shows a Voltage to Current converter based on a DAC, opamp, transistor and switches. The last one, allow to have a bipolar signal output. During the experimentation, the DAC is ...
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52 views

Open loop PWM with SG3525

I have seen the same issue posted here with TL494, but The feedback pin set up in that IC, seems to be different- so that I cannot adapt it here. I got an idea about how to implement a closed loop ...
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72 views

3.7 V to 12 V boost converter - effect on cell

If I boost a 3.7 V 18650 battery to 12 V with a boost converter, would it affect the durability of the battery? For example, if I have a 2100 mAh Li-ion boosted to 12 V, would it affect the 2100 mAh ...
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111 views

switch the (pnp) BJT transistor

this is my buck boost converter in the simulation i get the desire voltage -12V but in real circuit i just getting -4.88V , and my transistor heats up i think it is even burned , I dont know how I ...
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41 views

Question regarding chinese voltmeter ammeter module

I am new to this forum. I am a Diploma in Electronics from India and a passionate DIY hobbyist too. I have a question regarding cheap 10 amp ammeter and a voltmeter module I bought off aliexpress. I ...
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75 views

Drop input voltage for a boost converter

I have a 21V DC solar panel power source, that feeds a DC-DC boost converter. I set the output voltage of the boost converter to 19.5V to charge my laptop, but since the input voltage is higher than ...
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1answer
16 views

61000-3-2 Pre-compliance harmonics

I am wondering about 61000-3-2 current harmonics pre-compliance test. Say a company designs a single-phase [up to 13A] power converter for low-line 115V and high-line 230V and pass 61000-3-2 pre-...
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2answers
52 views

Charging 3S Li-ion pack over USB

I’m making a portable Bluetooth speaker and need some help with how to charge the battery pack. I have made a 3 cell Li-ion pack with a BMS to get a 12V battery for the speaker. My thought was to ...
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1answer
54 views

using mcp3008I/P adc with raspberrypi

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47 views

Synchronous boost light load operation and general SMPS terms

What are the differences between the skip cycle, pulse skipping, diode emulation, and forced PWM at general DC DC converter light load operations? How do they work and when do I want to use them? Page ...
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45 views

Average input current in forward converter

I am trying to understand how to calculate the average input current of a typical forward converter. If the converter has negligible magnetizing current, a large inductance and a turns ration of n1:n2:...
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82 views

I accidentally bought an HDMI (male) to VGA (male) cable that isn't an adapter or converter of any sort. Does this product have any value? [closed]

I have a laptop with an HDMI port. I have a monitor with a VGA port. I wanted to connect the two. The website I bought this cable from labeled it as an 'adapter' so I assumed it would do the ...
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1answer
98 views

Diode OR or transistor OR circuit?

I need a circuit that converts a 3.3V signal into a 24V signal. But I also need to be able to activate the 24V signal using a PCB switch. I can do it in two ways, using a diode OR or using a ...
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36 views

Transformer secondary winding resistance

I am struggling to understand how to model a resistance loss of a transformer secondary winding. In a typical flyback converter, if the primary and secondary transformer have a resistance loss, how do ...
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37 views

How to convert any periodic signal to a square wave signal using the Schmitt Trigger?

I had to make a kind of frequency meter, and what made me stuck was the signal formatting. I couldn’t build a circuit containing the Schmitt Trigger, which will allow me to convert any periodic signal ...
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41 views

What is the difference between an 230V/120V AC automatic voltage regulator and a step up / step down voltage transformer / converter?

There seem to be 2 kinds of devices to convert home mains AC power between 230V and 120V: some are named "automatic voltage regulator", and there are some labeled as voltage transformer or converter. ...
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109 views

I can't get the desired output voltage

This is a simulation of a buck boost converter. I want to get -12V as the output voltage , but I get -1.148V. I checked the PWM and the duty cycle and it is right. I think that my problem in ...
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30 views

Can I cascade boost converters?

Can I cascade the boost converters, each converter input connected to input solar panel (48 Voc and 9A Isc), and the converter output is 110 V? What should I do to connect them in cascade?
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72 views

It is possible to use a 100W 12V solar panel directly to charge a laptop, using a buck converter for example?

I am planning to go off the grid due to the pandemia, to an isolated village. I am working remotely I am looking for a solar approach to power my laptop ACER A5 515. The charger is rated 40W. I was ...
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39 views

output voltage of boost converter

I built a boost converter and I can't see on the oscilloscope the 12V in the output and the real frequency that I defined (70kHz.) What should I do? This is my circuit, and below that is what I see ...
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85 views

Conversion from 0V ~ 3.3V to -10V ~ + 10V

I need to do a voltage conversion to control a servomotor. I need to convert a pwm signal that ranges from 0V to + 3.3V into an amplified signal that ranges from -10V to + 10V. I thought about doing ...
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1answer
45 views

Relaxation oscilator with only transistor to measure DC voltage

I need to measure voltage from 12 to 100 volts with an MCU but with an isolated solution (so no voltage divider), my idea was to use relaxation oscillator coupled to Optocoupler in order to obtain a ...
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132 views

DC DC boost converter with TL494

I am designing a boost converter circuit 12V up to 60V using TL494. (picture below is the circuit I have designed). My problem is that the circuit cannot operate stably at the output voltage of ...
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4answers
1k views

Generating 5V from 37V DC with no EMI

I'm making a PCB for an audio amplifier + power supply (circuit here). The power supply voltage rails with my transformer end up being about +/- 37V, and I want to generate a 5V rail from this for ...
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1answer
65 views

12V PWM to Analog DC converter for car cooling fan

I’m installing two 12V 80W cooling fans in an old BMW which originally uses a PWM electric fan. This original fan has a three pin connector (constant 12v, ground and PWM signal from the ECU). I ...
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29 views

Terminology of AC -DC converters

I would like to ask about the difference between the terms "AC-DC Converter", "DC-AC Converter" and "Inverter". If I am getting it right, the "AC-DC converter" converters AC voltage to DC. The "DC-...
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3answers
63 views

Frequency Conversion Product Lower than 0 Hz (Negative Frequency?)

If I have a bandwidth of frequencies from 200 to 500 Hz made from cosine waves and I mix this with a oscillator at 400 Hz which is also a cosine wave, the mathematics of conversions show that I will ...
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54 views

How can I build a composite video to scart converter?

I'm interested in building a composite to scart adapter. How can I?
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3answers
152 views

Is it better to have a higher Vgs than Vds on a MOSFET (n-channel)?

I've been studying MOSFET switching applications recently, and have been playing with the Circuit Simulator Applet here. In my diagram below, I have Vds usually set to either 12 or 14, as I am trying ...
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3answers
50 views

Connecting two DC converter's inputs in series

I know it won't work, but I want to make sure I have the right explanation why it won't work. Given are two devices which have a build in converter (I have this digital voltmeter in mind). They need ...
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2answers
160 views

step up converter

I built a circuit of boost converter and my input voltages, 6-9V. I want to get output at the converter 9-12V, my problem is that I get over 40V and I do not know why, in the code do I have to set ...
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65 views

Boost Converter - How the diode keeps conducting?

In the OFF state (SW Open) the voltage across the inductor changes its polarity and "pushes" current through the diode. So we have a voltage source in series with the inductor, producing a voltage ...
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21 views

How to power LCD backlight converter (from HP elite 8300)

I have 3 LCD screen form broken "all in one" pc (HP elite 8300) And would like to recycle them as normal monitor, but for that i have to power the screen backlight. It's 4 wire coming out from the ...
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2answers
76 views

How can 10V AC change to 12V DC?

This is a circuit that takes 220V DC as an input. I understand how the 220V AC changed to 10V AC and changed to DC by whole-wave rectifier. But why is it 12V??
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56 views

How does a Resolver-to-digital converter work?

I am currently taking a class on sensors and sensor design and I came across this homework problem: In a commercial resolver to digital converter the digital angle Φ is determined to be 20 degrees. ...
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85 views

In a buck boost inverting converter is there any difference exchanging the position of the diode from the positive to the negative rail?

In a buck boost inverting converter is there any difference exchanging the position of the diode from the positive to the negative rail keeping the same current rotational direction ?
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How to reduce MOSFET heating in Buck Converter

I have designed this Buck Converter which convert 60VDC to 12VDC at 10A. Switching Freq 100KHz. Facing MOSFET too much heating issue. MOSFET ON time and OFF time is decided by a UC3845B based circuit. ...
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22 views

Power Converter Control Platform for Commercial Use

I'm designing a power converter for commercial use and I've been struggling to find a control platform that meets the typical industrial standards and can be used to do the control of the whole device....
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1answer
47 views

Converting negative voltage to positive

I am adding an ATX power supply as a bench power supply to power accessories on my model railroad layout. I prefer to run some lighting accessories at +7v, but obviously a power supply has +3.3v, +5v, ...
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89 views

What is the voltage value measured by an 8-bit ADC chip showing a binary reading of 64? the reference voltage is 3.3V

I followed the explanation in this post. I did 3.3 V/256 = ‭‭0.01289 V . I also did 3.3 V/(256/1.5) = ‭0.01964 . And lastly, I used this formula: I just keep getting the wrong answer! Please could ...
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28 views

Swapping a step down converter

I have a faulty graphics card i am trying to repair, i noticed on the back near the 12v connector that a step down converter in Q501 had a leg missing (right side, second from the bottom) and i am not ...
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1answer
60 views

Problems with hexadecimal table in VHDL

I want to convert from binary to hexadecimal but I found a few problems with VHDL in Quartus II. ...
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1answer
60 views

Flyback converter Transformer design- N87-etd29

I have designed a Flyback using UC3845, PCB and components assembling are done. But I have some problem in transformer. My primary winding is 40 turns ( 2 paralell 0.40mm), and secondary winding is 9 ...
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29 views

Boost converter - low inductance and discontinuous or high inductance and continuous?

I'm working on a battery powered application and I need to step up from ~3v to ~25V. I'm trying to balance the peak battery loads vs the overall performance. I'm torn on the inductor. I'm at ~2MHz ...
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2answers
664 views

Are Fiber Media Converters Technically Modems? [closed]

Fiber media converters are devices used to convert fiber optic signals to other types of (digital) network data. I'm curious as to whether these devices technically fit the definition of a Modem? If ...
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4answers
65 views

LED DRIVER: Buck Converters output current ripple

I need to design a led driver of up to 1A, to drive some infrared and near infrared LEDs. Due to the nature of my application, the intensity of the light should be as stable as possible, as ...
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122 views

Error “Too few nodes”

I got the spice model of component LM2842X on http://www.ti.com/product/LM2842/toolssoftware. When I run the simulation I get a "Too few nodes" error. The suitable image is attached. Can you help me ...
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65 views

Capacitance to digital converter for moisture measurement

I'm currently working on a irrigation system for which I would like to build a low cost soil moisture sensor. I would like to measure the moisture levels of a given environment based on a capacitance. ...

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