555 SMD Circuit

I've been buying SMD components from eBay and finely built my first SMD circuit. Its a simple blink-blink 555 timer circuit. You can get an app from the App Store on Apple called Electronic Toolbox Pro to figure out the numbers on the SMD resistors. Here is the schematic, pictures, and the video on my first SMD project.

Monostable & Astable 555 Timer Circuit

This circuit, schematic, and video stemmed from a video I made awhile ago. I needed to make a monostable circuit, so I looked back on that video and seen that I had no schematic. Here is the schematic for a monostable and astable circuit.


Monostable:

Astable:

Video:

Forward and Reverse Circuit for a DC Motor

I've been wanting to build a robot that drove around and if it came to an object, it would sense it with a ping sensor and stop and turn the other way. I was in a hurry to build a circuit that would make a motor spin both ways, so it took a few hours to get it to work. I never looked to a schematic of an H-bridge. The hardest part was getting the transistors that controlled the two sets of transistors to work. The transistors do get hot, but I've never had one burn up.

Here is the schematic and the circuit on a breadboard on my robot.

Here is the video.