The IR2113 is a very capable high side + low side MOSFET gate driver IC. It only requires 3 capacitors and a diode to function properly. You can switch the high and low side independently is you like. IR2113 capabilities
Programming a stand-alone Atmel microcontroller is not that difficult. As it turns out, they are already equipped with programming pins for ICSP, only the pins have to be ‘broken-out’ to a 3×2 header, or wired directly to a neighboring Arduino. Arduino vs solo IC The Arduino is a prototype board focused around the Atmel ATMEGA328 …
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Combine the ease of programming on a PC with the Arduino’s capability of digital IO, or the Wi-Fi connectivity the ESP boards give us. This utility is the command and control center for your Arduino fleet. Status At this point, the project just passed the proof-of-concept stage. I will now focus on adding other functions …
PyDuino – A Great Tool For Remote Control Of Arduino And ESP32 devices Read More »
How much inductance do you need for your buck converter to function nicely? I will show you how to figure that out without using any complex math. Formulas? Just in case you are still in doubt about doing the calculations, there are Greek letters involved. For me, that a personal limit I will not cross, …
With a couple of transistors, we can turn a MOSFET into a diode with almost no voltage drop, making it an ideal-diode. This is a proof of concept for using a MOSFET instead of a diode in a buck converter. This is also called an ideal diode. Device for testing I made a very basic …
DIY Ideal-diode Circuit Is Great For Improving DC Converter Read More »
You can buy great and cheap DC-to-DC converters on the internet. Wouldn’t it be great to control them remotely, well, it turns out we can! Introduction This is a follow-up of a proof of concept I made two months ago. I used an Arduino based DAC (8 bit 8 resistor) and an op-amp to create …
There are situations where you absolutely want to avoid signals overlapping one another. This is when you get introduced to the term dead time. I will give you an example of a circuit that needs dead time and I will show you how to create it, and how it works. An example This is a …
These are a couple of circuits that can drive a MOSFET. Each of them has their own pros and cons, so whether or not they are useful is highly dependent of what you want to do with them. Low side 1. Direct drive This is the direct drive method. We can drive a MOSFET straight …
We can use a generic op-amp like the LM4562NA. We build an oscillator from the first op-amp in the IC. This produces a triangle-wave. We feed this wave into the second op-amp. We also add a controllable voltage from a potentiometer. Compare this against the triangle wave and we have PWM with a controllable duty-cycle. …
How to make an op-amp output PWM with duty-cycle control? Read More »
Op-amp is short for operational-amplifier. You can use it as a comparator, buffer a signal, or amplify a signal. These are some op-amps I have; they are the LM358 and the LM4562. The first is a generic op-amp and the second one is designed for audio purposes. Both however, have the same pin-out and should …
The IR2110 is a very capable high side + low side MOSFET gate driver. It requires a diode and three capacitors to function properly. You can drive the high and low side independently if you like. IR2110 capabilities
The IR2125 can drive high-side loads up to 500 volts. And only a few external components are needed to use this compact MOSFET gate driver. Package The IR2125 is a 8 pin DIP IC External components The IC is powered with a voltage between 10 and 20. The MOSFET’s gate pin gets to see that …
I wanted to build an analog output for my Arduino, a DAC. The default solution is to create a R-2R network like in the picture below. This resistor network needs 17 resistors to function. I do not have 2k resistors. The only values I have are up to 1 million ohm in these intervals 10, …
A resistor divider creates a voltage in between the top voltage and ground. In this post I try to explain why that is. TLDR: It is a result of current going into the midpoint from the top resistor vs current going out through the bottom one. It is because of Ohms law and its linear …
Repurpose a wall adapter Most of us have wall adapters collecting dust in a box. We can crack these open and reuse the board in it. And then we integrate this into our project. We need to doe the following things Extract the board If you put the adapter in a vice, just clamp it …
How to power a circuit from high voltage – Repurpose a wall adapter Read More »
Rotation-matrix To rotate a pixel around an axis, we need to do some sinus and co-sinus calculation to it because, in short, rotation follows a circular path. The good part is that the sinus and co-sinus part of the calculation remains the same for every pixel, because they all rotate the same amount. The next …
Voltage to high or to low to analogRead() directly into your microcontroller? With the right resistor-divider, we can read anything we want. There are three distinct problems, each with its own solution. The positive voltage is above 3.3v or 5v If we apply double our maximum voltage over two identical resistors in series, we expect …
With A Resistor-divider You Can AnalogRead() Anything! Read More »
The first is by using an NPN-transistor, and the second a N-channel-MOSFET. Both circuits are pretty much the same otherwise.
If you are one of the many people exporting electricity to the grid, chances are you are familiar with the following… When you export electricity you also get to pay energy taxes and or other grid fees. So even if your net-consumption is zero, you still own taxes. This might not be the case in …
How to create a power limiter to get zero-on-the-meter to save taxes Read More »
My electric water heater consumes a lot of electricity, and it does so at times when it is most expensive. This is because I have dynamic prices which change every hour and I shower at an expensive time. And even if a had a high&low tariff, the problem would still exist. There is more than …
How to create a smart switch for an electric boiler to save money Read More »