Make: Electronics Book Experiment 10 - Transistors for switching and amplification

This is part of a series of videos in which I try out some experiments from 'Make: Electronics', Charles Platt's excellent introduction to electronics. In this video, I try out Experiment 10 in which the book explains how transistors can be used for both switching and amplification. 00:00 - Introduction 02:17 - About the transistor in this circuit 03:15 - Using a transistor to turn an LED on and off 05:26 - Using a low current signal to switch a high current on and off 06:16 - Using a transistor to amplify a signal 07:27 - Measuring current to base 09:09 - Measuring current through collector - emitter 11:40 - Summary of results 12:06 - Amplifying current flow through my finger 13:41 - Delayed switching circuit demo 16:44 - Using a trimpot to control the delay time 19:17 - Outro Links to the book: https://amzn.eu/d/cXyVlfW (UK) https://a.co/d/i11zkxM (US) In the video I mention relay computers. This is the first in a series of videos showing how a relay computer is built: https://youtu.be/F__TroRudww?si=XcpHIVCaQxUCftnt You can find further information on the components used in this experiment in Volumes 1 and 2 of the 'Encyclopedia of Electronic Components': Vol 1: https://amzn.eu/d/1lzEccv (UK) https://a.co/d/4S3oVfm (US) Vol 2: https://amzn.eu/d/4QuPQL9 (UK) https://a.co/d/5wyCFtg (US) I'm not associated with, incentivised by, or paid the publisher or author, I'm just a hobbyist sharing my experiences of the book.