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More project information on Instructables (parts list, schematic, code): http://www.instructables.com/id/Turn-...
The video I was watching in the beginning was made by Afrotechmods:    / afrotechmods  

Parts list (affiliate links):
Aliexpress:
1x ATtiny85: https://s.click.aliexpress.com/e/_dZQ...
1x NE5534: https://s.click.aliexpress.com/e/_Bf7...
1x Electret Microphone: https://s.click.aliexpress.com/e/_dSi...
1x 20kΩ Potentiometer: https://s.click.aliexpress.com/e/_dX8...
1x Resistor Kit (various): https://s.click.aliexpress.com/e/_dTP...
1x 100nF Capacitor: https://s.click.aliexpress.com/e/_dU4...
1x 1N4002 Diode: https://s.click.aliexpress.com/e/_dYR...
1x BC 637 NPN Transistor: https://s.click.aliexpress.com/e/_dTk...

The circuit can only switch ON/OFF AC appliances with less than 200W of power.

Wouldn't it be nice to turn on your lights without getting off the couch? In this video I am going to show you how to build a simple Arduino clap circuit which can turn on and off all kinds of AC appliances.

Music:
2011 Lookalike by Bartlebeats
Killing Time Kevin MacLeod (incompetech.com)