Motorized Digital TV Antenna Mount (aka Digital TV Antenna Pointer)

Sound-level Indicator

In this video, I show the circuit for a simple sound-level indicator and demonstrates how it works. Circuit may be found at

Light Sensitive Switch

Demonstration of a simple light sensitive switch made with an op-amp configured as a comparator. Obtain schematics for Free at

Simple Calculator

Demonstration of a simple calculator made of seven segment displays, seven segment drivers, AND, OR, NOT, and EXOR gates that add two numbers together.