Saturday, December 19, 2015

Multisim| Stopwatch Timer Cascading 7 Segments 74ls190 74ls47

Hi makers,
In this blog a stopwatch is simulated in Multisim and converted to a PCB layout via Ultiboard

Build of material:

  1. Two 7 segment displays
  2. Resistor packs (100 Ohms) *included in updated model
  3. Two 74ls190 (up/down counters)
  4. Two 74ls47 (BCD decoder)
  5. 555 Timer (1MHz digital clock in Multisim)
  6. One toggle switch (up/down)
  7. 1 Tact push button switch (reset)

Monday, October 5, 2015

Liked on Pinterest: Make a Photon Flower That Lights Up When You Water It with Lemon from Instructables

Description: Make a Photon Flower That Lights Up When You Water It with Lemon from Instructables

By Delaware Libraries
Pinned to Maker Spaces & Activities (700) board on Pinterest
Found on:

Liked on Pinterest: "Crystal Radio: A Science Kit for Student Electronics": Build a crystal radio and then tune in an AM radio station--without batteries. An improved crystal radio kit and an updated procedure makes this a great choice for an assigned #science project or just for hands-on #electronics fun! [Source: Science Buddies,] #STEM #scienceproject #crystalradio

Build a Crystal Radio

Description: "Crystal Radio: A Science Kit for Student Electronics": Build a crystal radio and then tune in an AM radio station--without batteries. An improved crystal radio kit and an updated procedure makes this a great choice for an assigned #science project or just for hands-on #electronics fun! [Source: Science Buddies,] #STEM #scienceproject #crystalradio
By Science Buddies
Pinned to On the Science Buddies Blog board on Pinterest
Found on:

Sunday, October 4, 2015

Dual Power Supply using 2 9V batteries

Learn how to connect two 9 volt batteries to get:
  • +9V
  • 0V
  • -9V
Simple 5 minute newbie special.
FYI: Why is negative voltage necessary anyway?

Negative voltage is not all bad. Yes, if you switch the orientation of a voltage source to negative polarity for many circuits, the circuit may not work anymore, but in other circuits that require negative voltage it has extreme use and the circuit cannot work without it.
One example of an electronic device that many times uses negative voltage is a transistor. Dual op amps need both positive and negative voltage to work.
*Note 0V is not the same as -9V. 0V is considered ground any other voltage is positive or negative.
I wonder if that's where they get the phrase "Let's start from ground zero." :)

  1. Take two 9V batteries and stand them side by side. With the a negative and positive terminal facing each other.
  2. Connect the terminals in series using an alligator clamp.
  3. For the two remaining terminals, connect an alligator clamp. One for each side.

With your multimeter check the voltage of the left battery by placing the black test lead on the ground between the two batteries and the red test lead on the alligator clamp on the left as pictured.
Now check the voltage of the battery on the right by placing the red test lead on the alligator clamp coming from the positive terminal.
If a battery has positive orientation, its voltage with respect to ground is more positive than ground, and it delivers current to the positive part of a circuit. If a battery has negative orientation, its voltage with respect to ground is more negative than ground, and it delivers positive current to the ground part of a circuit.

Project complete!

Now that you have yourself a dual voltage supply check out some circuits that need negative voltage.
Like my projects? Share them with your friends & subscribe to myYouTube channel :)
Thanks for your support!

Monday, September 14, 2015

Paper Circuits|Use cardstock, reactive foil, and a laminator

This blog will show you how to make (art or a working) paper circuit. Paper circuits are common and easy to make. I used a basic laminator, cardstock, and reactive foil
  1. Choose a basic circuit schematic or art design you like. 
  2. Next you will need to print your work using alaser printer using black ink. The heat reactive foil technology will adhere to this type of ink. 
  3. After you have printed your work on card stock you will now be able to send it through the laminator. Simply cut the foil to match the card stock. 
  4. Place the foil paper on top of the card stock
  5. Send both pieces through the laminator. 

Optional (to make a working circuit try laying copper tape or conductive thread on top of printed traces) 

Click here for video:

Here's what I used:

*HP LaserJet Pro Printer
*Scotch Laminator 3mm or 5mm setting
*Black card stock 

Monday, September 7, 2015

Paper Circuits|Use cardstock, reactive foil, and a laminator

Paper Circuits|Card stock circuit with foil paper easy

Create a simple circuit using card stock, reactive foil, and a laminator :) For actual working circuit reinforce with conductive material such as metal tape (copper, silver, aluminum etc) or conductive ink.

Think this is cool? Leave a comment :)

Thursday, August 20, 2015

Multisim and Ultiboard| 74ls240 wired 3D PCB

Ever wonder what is a buffer and why is it useful? In this blog I will show you how to wire a 74ls240 TTL using NI Multisim and NI Ultiboard and some practical applications. First a few keywords:

  • Buffer = symbol is a triangle and its input is its output. Purpose is to slow current.
  • Octal = eight. The 74ls240 has eight inputs/outputs
  • Tri-state/3-state = allows an output port to assume a high impedance (Z) state in addition to low and high values.
  • Fan out= number of devices that an output is attached to.
A tri-state buffer or inverting buffer looks like a regular buffer or inverter, except there is an additional "enable" control signal entering the gate. When the enable is "1" the buffer is driving the output; when the enable is "0," the output is turned off ("tri-stated"). 

74ls04 vs 74ls240 Ok the 74ls04 takes its input and outputs the opposite i.e. high=low low=high.
The 74ls240 is a bit more complex...kinda. It can also take its input and output the opposite depending on the G pin. This is what makes the 74ls240 different. The output is determined by pins G (1G or 2G) and pin 1A(1-4)/2A(1-4).  
When the G input is high, the output is "Z" and no electrical current flows through no matter if pins 1A(1-4)/2A(1-4) is high/low.

Saturday, July 25, 2015

74ls163 Clock Counter Project|Atanua

PictureA while back I posted a blog about the 74ls163 Synchronous Counter. In this blog I will revisit the same TTL using Atanua software. After playing with the 73ls163 I gained a little more insight about it. 

I found that (referring to the diagram) by changing the input values you can program the count up starting number. This TTL can only count up! To do this you will use input switches 1-4
Switch A is used to clear the counter and pin 2 is for clock connection. The "Ripple carry output" (RCO) used to enable successive cascaded stages. *floating pin in the diagram.

After setting your desired starting number, you can enable P, T & Load to start the count. You will see your project initiate from the programmed value. However, to keep the clock in a loop additional TTL's must be added; the 4 input Nand & Invertors. A nice project write up can be found here: 

Check out my YouTube video to see the simulation of 74ls163

Saturday, July 18, 2015

DesignSpark|PCB Settings

First you will need to start with a new PCB Design. You are able to specify how many layers your board requires and if you will start with a circle board. The file should open with a square PCB by default. To erase the pcb press the Select Mode icon (second to the last: arrow icon) select the pcb and press delete on your keyboard or click the red X icon.
Now you can proceed with your new pcb shapes. To do this, on your tab bar go to ADD: scroll down to Board and select any shape. You are now able to make your desired board shape. Try a few different ones. Next option to choose is changing the colors of the pcb, components, traces, silkscreen, and pins. There are 48 standard colors to choose from and also a color palette option!
As you can see DesignSpark allows you to design many pcbs in one work space. However, selected pcb settings will apply to all boards within the work space.
Enjoyed this blog? Subscribe below.

Monday, July 13, 2015

Design a Multi Layer PCB in Ultiboard

Sunday, July 12, 2015

DesignSpark: 3D Modeling Software Review

DesignSpark PCB Review                                                            
By: Larsha Johnson

When it comes to PCB/3D modeling there is a plethora of software to choose from, such as Altium, DipTrace. PCB 3D, Target 3001, NI Ultiboard, DesignSpark and more! For those of you who have read my previous blogs you'll know the past circuit designs were created using NI Utliboard. In this blog I ventured out into the world wide web for more 3D rendering software options.DesignSpark is what I found and here are my results.

What I like about DesignSpark so far (an hour in) is that there was no cost! I simply downloaded the software and was able to jump right in. However, the downside is that you are required to create an account to use it. Coming from NI Ultiboard to DesignSpark I was very knowledgeable about how the user interface worked. I will admit I watched one YouTube tutorial to get things moving. 

I soon found myself designing (placing a few random components if you will) my very first circuit. The purpose was simple, test the user friendliness of other 3D software. Overall I will say that DesignSpark is definitely easy to use. And the components look amazing.

There is one feature that I liked the most in this pcb 3D software and that is the option to change the color of the board. Join us next week for an update on colorful pcbs.

Tuesday, June 30, 2015

HP 50g: Magnetism - Straight Wire & more

magnetic field is the magnetic effect of electric currents and magnetic materials

In this blog using the HP 50g, I will show you how to get to the built in equation library and solve equations for straight wire magnetism. The units for such is Tesla. If you are required to answer in Gauss you will need to convert.
After turning on your HP 50g:
  1. Press APPS
  2. Scroll down to #12 or type in 12 (Equation Library)
  3. Press OK. If Soft Menu mode is on you will see four boxes. Eqlib  Colib Mes Utils. ChooseEQLIB. This is for the equation library.
  4. In the library there are many choices. Today we will explore Magnetism. Go ahead and scroll down, press ENTER.
  5. This brings us to today's topic. Straight Wire. Press ENTER. You should now see the see the equation. The soft key choices are now 
  • Solv Equ Vars Pic -->Stk Exit

  1. PIC will show you a visual of the straight wire equation.
  2. Vars gives a description of each variable that can be used in the equation.
  3. EQN is the equation itself. The --> Stk puts the equation onto the stack.
  4. The main soft key choice is Solv. This is the equation solver. To enter numerical information you must first key in the constant ex: 5_cm radius and 4_A current; -press 5 then press F2B the key directly under the r soft key menu, then 4 and F4Dfor current...soft key menu I.
  5. Now to solve for B we must first press the White Right Shift key <-- and then F5E (B soft key menu)
Then solver should output the answer. Play around with different equations to get a feel for the powerful HP 50g!

Please subscribe for more at
Thanks Bits~

Thursday, June 18, 2015

LM3875 Amplifier NI Multisim & Ultiboard 3D

Wednesday, June 17, 2015

555 Timer: Ultiboard Design by Bits

The RED 555 Timer. 

This is a simple 555 timer circuit however, it has been redesigned by Bits. My idea of circuits and TTL components should have a bit more color options and since they (colorful TTL's) don't exactly exist I thought I'd just give the world a taste of what future circuits could look like when future engineers take office!  
I used Multisim software and Ultiboard to come up with this unique red color for the 555 Timer. Ultiboard allows the user to modify almost any component on the circuit. Another fantastic feature was the option to change the shape of the pcb board. No more boring rectangles! I have included some of the different shapes that were possible. Here's a quick video!


Saturday, May 9, 2015

Mother's Day 2015 - Last Minute Craft Ideas

Happy Mother's Day! Please share.
Mother's Day doesn't have to put a deep hole in your pocket. Gift giving on this day should be easy. 
In this blog I will show you how I made this colorful desktop flower pot for less than $5.

  1. Trip to the Dollar Store
  2. Browse the craft section
  • Popsicle sticks
  • Birds or butterflies
  • Toppings (marbles, shells, etc. Be creative!)
  • Floral foam
  1. Start the flower pot off by gluing two popsicle sticks in an "L" shape. The third stick will not be long enough to make a perfect triangle but don't worry, your pot will be adorable. Glue the stick on top of the previous two.
  2. You will continue this pattern of  stick gluing until you are satisfied with the height or until you run out of popsicle sticks. Let dry. (In the photo I did not :/)
  3. Next you will cut the floral foam into the shape of the flower pot, squish it into place. This will aid in the arrangement of your artificial flowers.
  4. Flowers can be snipped down to size of flower pot. I used a pair of wire cutters.
  5. Once desired arrangement is finished, add birds, butterflies, etc. Add a mini picture frame to complete this project.
Your one of a kind gift is ready! 
Make this Mother's Day a special one with love. 

Sunday, May 3, 2015


74LS Series
  • Synchronous 4-bit counter
  • Dual-In-Line Package
  • 16 pins

Friday, April 24, 2015

We're on Etsy - Cool custom gifts come see for yourself!

Circuit Cufflinks

Hall Effect Sensors

Motion Sensor - PIR - DIY Module - Easy 3 PINS ( Power, Ground, Output)
                                                                                                   Motion Sensor
Potentiometer Knobs

LED's Variety Pack 14 PCS - Light Emitting Diodes - 3mm - Hobbies + Projects - Water Clear 7 colors

3mm Leds Assorted

Periodic Table Shower Curtain

Periodic Table of Elements Shower Curtain - Big Bang Theory                                         Breadboard 16cm (full size) with Power and Gnd

Doodle Doggie Badge

Badge Life - DIY Doggy Blink Badge DIY led puppy badge. White PCB in a puppy shape. DIY to wear. Try adding color. Customize it! Ru...