Power Supply

Instead of using wall transformers to power my equipment, I decided to see if I could easily build a variable power supply. This way I can add the same connectors to the hardware and use them with the same power supply. I had an old power adapter from a HP printer laying around. I like to try and use old hardware to build new things. It gives off 19 volts and 7.1 amps. So I started looking for a way to control/vary the power coming from the adapter.So I picked up this DC DC Buck Converter CC CV 50V 5A Power Module.

Components for Power Supply

Power Supply Working

Now I don't have to have all these different wall transformers taking up space. I intend to either build a box from some plastic I have laying around or maybe 3D print the case. I will come back to it when it is done.

The Engineer-it Kit

 

I received "The Engineer-it Kit" from Amino Labs. It is a bacterial transformation kit.

I read about this kit in the book I talked about in an earlier post - "Zero to Genetic Engineering Hero: The Beginner's Guide To Programming Bacteria At Home, School and In the Makerspace."

By Justin Pahara and Julie Legault.

If you are a beginner in bio-engineering this is a good place to start. The kit is well priced, I felt shipping was a bit high but that is probably out of their control. It comes with almost everything you need, except the hardware. You do need a incubator (they do supply you with a video link to build a very simple one ), a hot and a cold water bath. I used an ice bath for my cold bath. They do have an all in one hardware that will do all of this, that you can purchase. Though it is expensive.

 

 

 

 

They made this kit to be as simple and easy to use as possible, even a beginner can do it. They supply you with everything you need:

Bacteria, plasmid, antibiotic, agar, petri-dishes, inoculation loop, streak template and even the sterile water.

They give you a manual.

Here is a video showing you all steps in the protocol.

You can even use a simulator to do the protocol.

If you are interested in bio-engineering this is a good way to start. As well they have other kits that you can purchase separately. This way it is not a huge outlay of money all at once.

WOW!!! 100,000 Page Views

Can you believe it? I have just passed 100,000 page views. I know I can't. When I first started this blog, I thought no one would look at it. But surprisingly I have received comments and emails from around the world. I hope everyone has enjoy reading this blog as much as I have putting down my thoughts and doings.

It has been a busy couple of months. I do have many projects I have been working on and will be posting them over the next little while. So stay tuned!!

Thank you for reading my blog. I do hope to continue adding to it for a long time.

Lawrence

 

Shaker

Shaker

Image 1

 

 

Visiting another second hand store I found this shaker. I have been thinking of making my own for quite sometime and I will still try to make my own at a later date. As can be seen (Image 1) it needed a lot of cleaning outside and in. It worked as is but seemed to struggle to get started. After taking it apart I saw it was full of grime and dirt. Once I cleaned that up it works really  well.

 

 

Image 2

 

Image 3

The platform holds 15 ml conical tubes. The platform comes off very easily so I am going to build different platforms to hold different types of tubes, flasks, beakers and jars. But in the mean time I 3D printed these holders (Image2) for 50 ml conical tubes, 250 ml flasks and 500 ml mason jars. I also printed a yellow tab (Image 3) that fits in the platforms holes to hold these holders in place(Image 4). This is until I can build new platforms to hold each item. I also want to build petri dish holders for it to.

 

Image 4

 

Again a second hand find turns out real well. You do have to visit many different second hand stores to find something you might need or can use. Many times I do not find anything that I can use, but I see things that gives me ideas of what I might be able to build or use.

Media Pump

Using a Syringe Filter to Sterilize Media:

Syringe and Filter

I picked up some syringe filters from Amazon figuring I could use a syringe to pass my media or water through the filter. As seen in photo the filter screws on to the top of syringe. This filter membrane has a pore size of .22 micrometers. This should easily sterilize the fluids.

Parts

 

Thinking there must be an easier way to run the media or water through the filter I picked up a 12V DC DIY Peristaltic Liquid Pump from Amazon. As seen in this image as well as the pump I picked up air hose tubing and airline tubing connectors from a pet store. The connectors allows different sized tubing to fit together.

Fitting to hold filter

I had a medical drop administration set I found at a flee market. This has the same type of connection as the syringe tip has, allowing the filter to screw on. As seen in the above image.

Unit put together

In the final image you can see the whole unit put together. I am using a 12 volt wall adapter hooked up to the motor speed controller (previous project) to control the pump motor. The filter holder was made with a 1/4 inch dowel and clothes pin glued together.

I pump the fluids through the system slowly as to hopefully not cause a big mess if it ever backs up. I intend to mount the pump into a weighted box so I don't set it up when I need to use it.

Motor Speed Controller

I found this motor speed controller module at an electronics surplus store. This will allow me to build a controller module that I am able to control more than one devise by just plugging and unplugging each device.

 

 

 

Parts Used in Build

 

As can be seen in the first image there is the controller, case for the controller, wire, control knob, male power connector (black and green) and female power connector (black and green).

 

 

 

Put Together and Working

 

 

In the second image you see it put together. I ended up using 2 female power connectors. It was very easy to put together. I connected a DC motor to test how it works. I am very pleased with the device. The power connectors are labelled with 'M' for motor output and 'P' for power input. Using these female connectors I am now able to connect different power adapters(3v - 12v).

The power connectors(found at an electronics surplus store) are also a great find. With these I can create different connectors and adapters. People are always throwing unused power adapters at me so now I can use them no matter what end they have. Wires are screwed in at one end of the connector. Where the wires connect it is labeled with either '+' or '-'. So if you find any get some.

 Second-Hand Store Finds

Second-hand stores can be a great place to find lab equipment and science kits. Though it is a hit or miss. Many times there is nothing to be had there. The biggest drawback can be the cost of the items. Some places charge outrageous prices for items. So be careful when looking and buying.

I found some electronic equipment I intend to use in some of my experiments.

1) A SOAR Corp. analog CRT based oscilloscope. From the simple tests I have done with it, it seems to be working fine.

 

 

Oscilloscope

2) A Cenco A.C. volt meter.

A.C. Meter

3) A electronic breadboard. To this I had to add the binding posts myself. Luckily I had some in my lab. The posts did not fit the holes. I did not want to buy any new ones so I designed and 3D printed fittings for the holes that the posts fit into. You can see the yellow fittings under the posts.

Breadboard

For less than $30 I picked up some useful equipment for my lab.