A simple methodical approach to working out appropriate resistor values for a transistor amplifier stage.
I initially work out the values & voltages with a schematic on screen, then build the circuit on plug-in breadboard to show the real world voltages from those resistor values, and the waveforms from the circuit, using a signal generator and oscilloscope.
See the chapter list below for the video topics:
00:00:00 Intro
00:00:07 The circuit
00:01:05 Principles and calculations
00:02:48 Decide the collector resistor value
00:04:40 The emitter resistor
00:05:35 Collector & emitter voltages
00:06:30 Base voltage
00:06:55 Bias divider resistors
00:09:15 Calculator time!
00:10:00 6:1 vs 1/6th confusion corrected
00:10:30 Final answer calculations
00:11:44 On to the breadboard
00:12:00 Selecting components
00:12:45 Verifying the resistors
00:13:45 and the transistor
00:14:10 Assembly,
00:16:06 And power!
00:16:45 Voltage tests
00:17:18 Dodgy transistor....
00:17:45 New transistor
00:18:20 Voltage tests - all good, now
00:19:14 Sig gen & scope setup
00:22:02 Signal waveforms
00:25:00 Varying levels, to clipping
00:28:20 Increasing AC signal gain
00:31:00 A chameleon "150 Ohm" resistor...
00:31:30 Gain with that fitted??
00:32:10 Bigger capacitor?
00:33:05 100 Ohm resistor
00:33:55 Lots of gain!
00:34:15 Chameleon identified: 750 Ohms!
00:34:35 Back to the waveforms and gain
00:35:15 33 Ohm resistor
00:35:40 Waveforms, more gain
00:37:52 Circuit summary
00:38:35 Thanks for watching!
