Previously I added 555 timer in astable mode to generate pulses for the counter chips. In the next step a second 555 chip is added. This timer runs in bistable mode (see pg. 176 of Make:Electronics). The purpose of this timer is to freeze the counting when the tactile switch is pressed (figure 4-40 of […]
Category: Make:Electronics
The next step in Experiment 18 of Make:Electronics is the addition of a 555 timer in astable mode to the circuit (pg. 175 of the book). This addition drives the decade counter therefore the tactile switch that was connected to pin 1 of the first decade counter from the previous part of the experiment had […]
With the arrival of the Kingbright numeric LED with the correct width (see my earlier post) I was able to continue experiment 18 of the book Make:Electronics (pg. 170). In this experiment the reader will eventually build a reaction timer using the 555 timer chip and 4026 decade counter. The layout of my numeric LED […]
I wanted to continue with experiment 18 of the book Make:Electronics today but discovered that the Kingbright numeral LED’s that I received were the wrong type after all. The width of the component is to small to fit in the breadboard (it is 2/10 inch instead of 3/10 inch). I ordered the 3/10 numeral LED’s […]
A small update. Saturday I received the rest of the components that I need for the Reaction Timer (Experiment 18 of Make:Electronics) and the rest of chapter 4. I couldn’t get all the components on the shopping list (see pg. 147) from my online supplier so I had to choose some alternative components. Notably the […]
Last weekend I had a chance to continue with the next experiment. Make:Electronics suggests to set it up on the same breadboard that still has experiment 16 on it. This is for later experiments when the 555 timers will be chained. Again this is an easy experiment although I almost forgot all important connection between […]
I completed the projectbox yesterday. It is looking good (well good enough) and I was eager to wrap-up the project. Just a few solder joints and it was finished. Before I started soldering, as I final test, I screwed the circuit board in the box and plugged in the power, I opened the magnetic sensor […]
A couple of years ago I started working with electronics as a hobby. The reason was that it seemed cool to create electronics gadgets and learn about electronics in the process. I had limited training in electronics so I decided to start with simple electronics kits. These kits contain a PCB, electronic components and a […]