Objective and Motive:
I really like how binary counters can link together in chains. For example, if you have two 8-stage binary counters, you can use them together to easily make a 16-stage binary counter.
I always wanted to do that with decade counters. And today I found a way to do this!
Step 1: Gather the Parts
• lots of jumper wires
• two 4017 decade counters
• one 555 timer
• two 0.1 µF capacitors (#104)
• one 10 µF capacitor
• one 1 nF capacitor (#102)
• five 10KΩ (or anything between 4.7kΩ and 22kΩ)
• three N-channel mosfets
• one switch
• one or two breadboards
• one 5V power supply
With these in hand, you should be ready to make a 16-stage decade counter!
Step 2: Examine the Schematic
You can click on the schematic picture to see a full-size version.
The 16 green wires on the right of the schematic are the 16 outputs.
I suggest you put 16 LEDs on those outputs with 1KΩ resistors in series to monitor the outputs of this device.
If you don't know how to read schematics, I suggest following this tutorial:
Collin's Lab: Schematics
Step 3: Build Your Circuit
Assemble the circuit on a breadboard using jumper wires to connect components.
I recommend referring back to the schematic while building your circuit on your breadboard.
If you can pack your LEDs together tightly, it will save you some breadboard space.
In the end, I had to expand to using a second breadboard because my LEDs took up so much space.
I'm getting some LED bar graphs to fix this problem :)