Cool Cap Engineer

Engineering by an anime nerd

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PSA- The Disappearance of CoolCapEngineer

It’s been a long time since I posted on this blog. The reason for the disappearance of posts was the fact that I came to a realization that my past job was making me miserable and needed to obtain a new job. Let me explain what happened.

If you’re a regular visitor on the blog, then you might be familiar with the fact that I worked as a Junior Project Engineer in Woodstock, NY. However, the job was not as amazing and career advancing  I expected it to be. The environment was unnecessarily stressful as my supervisor and my co-workers made things very unpleasant for me. My supervisor would verbally abuse me for the way I completed my assignment despite the fact I finished the tasks in a timely manner.  Some of my older co-workers would demean me for making small mistakes- e.g. mixing up which electrical component leads or lags for current during conversations.  It was to a point where there were accounts of racism – a topic which I honesty try to avoid as much as possible- was mixed in the verbal abuse. So from January till mid-February, I spent my time looking and applying for new jobs.

Despite the stressful situation, I managed to obtain an associate design engineer job near Boston, Massachusetts- a location which I always dreamt of living even before obtaining my previous job. Thus I will begin working for this company during the first week of March and began the moving process.

So what does this mean for new posts? Unfortunately, I will not post any new articles until the start of the summer.  Although I could start posting new articles in April, or when I’m fully acclimated with my new job and living location, I see this as an opportunity to drastically improve this blog including a new look, new articles, a chance to show the small lab I’m trying to setup in my new apartment and a new V-blog category.

As for my Arduino brushed motor controller project, I have not forgotten about it and will resume working on before the blog starts.

Despite my hiatus, my Twitter page will still be active. Be sure to check it out when you get the chance as I keep up with power electronics, microcontroller, Kickstarter, and cool electrical engineering projects. Until then, I hope you guys have a wonderful day and see you during the summer!

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PSA: Kept You Waiting, Huh?

Yah…it’s been quite a long time since my last post. A lot has happened since June: I graduated from RPI, moved to Kingston, NY, and started working at a company with a focus with motor control circuitry and power electronics, which I honestly did not expect. But enough about my long hiatus, now it’s time to talk about new blog updates, and when you guys can start seeing new posts.

First things, first: projects. I cannot believe I’m saying this, but my face tracker project will have to be cancelled, due to my lack of Open CV coding knowledge. I feel embarrassed cancelling this project, since this is the third project I will cancel on this blog. HOWEVER, I am working on a power electronics project, which is 70% finished (I just need to buy some parts and to test the project).  I will talk about this power electronics project on the blog very soon.

Second thing: categories. Now that I’ve been given a stellar electrical engineering education, I will be writing basic electronic posts. These posts will not only give you a premier on basic electronic parts, but more in-depth topics to consider.  Although I talked about the PIC18F here on the blog, I was introduced to the dsPIC30F family of microcontrollers quite some time ago. In other words, I will no longer be writing microcontroller tutorials on the PIC18F but rather on the dsPIC30F.

So when can you guys start seeing new posts? Right now, I am devising several new posts as we speak. I would say December 2nd. I will publish new posts once a week so that way it will not affect work life.

If you guys still want to hear what I’ve been doing, then visit my Twitter page. Here I will be posting some cool engineering projects I’ve found, as well as the projects I’m currently working on. Again, I apologize for the long hiatus, and expect some new content soon!

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Electronics: MAX619

One of things I remembered doing a lot last semester at RPI was building various analog circuits in my free time. One of my good friends who’s a lab technician for one of the labs at RPI, had reels of ICs that never been used. He even had 3 reels of Motorloa’s microprocessors that came out in the 1980s. However, one IC that I found extremely useful was the MAX619 IC. The Max619 IC accepts voltages between 2.7 and 3.6 volts, and converts it to 5 volts using charge pumping.

Max619 Pinout

To be honest, the pinout is really straight forward and I will not go into much detail.


C1+ (Pin 1) and C1- (Pin 8): This is where you connect your .22uF capacitor to.
In (Pin 2): This is where you connect your input voltage to. As I stated before, the input voltage range from 2.7 to 3.6 volts.
Out (Pin 3): 5V output of Max619
C2+ (Pin 4) and C2- (Pin 5): This is where you connect your second .22uF capacitor to.
GND (Pin 6): Connect this pin to 0V of your power supply
SHDN (Pin 7): To make sure the IC is properly working, connect this pin to 0V. Otherwise, the chip will not turn on.

Circuit Diagram


Although there’s an example schematic in the datasheet, I decided to create a quick schematic in Eagle Cad to show where you should connect your capacitors to. Please note: the IC will not work if you connect a capacitor from C1+ to C2+ and from C1- to C2-.


Increasing Output Current


Although the voltage will increase from 2.7-3.6 volts to 5v, the output current will be really low. When I first tested the IC, I got around 90ma. If you need to power more beefier devices, then you can connect two or more MAX619’s in parallel. In fact, the picture above shows me building a two level multi-level DC to DC converter using two MAX619 ICs. The output current of the converter was around 180ma. Since you’re increasing the output current of the device, you’ll also increase the input current the device needs. My advice is to use the chip with hi-current batteries such as Lithuim Ion batteries.

That’s all I have for you guys today. If you guys have any questions or concerns, feel free to post a comment!