Introduction - page 1
How Amplifiers Work - page 0
The Current Amplifier - page 2
Ringing
The Basic Audio amplifier
Output Protection. - page 3
Over-wattage Protection
Low Impedance Audio Amplifier
Nonsplit Power Supplies
Coupling Capacitors
Switching for 10W Amplifier
CMOS Switching
The FET Switch
Digital Switching
Features of 90V Amplifier
Balance Control
Tone Controls
Quad Input Amplifier - page 4
High Voltage Current Amplifier
Gain Chart for 90V Amplifier
Switching for 90V Amplifier
Digital Circuits for 90V Amplifier - page 5
Digital board
Board for 90V Amplifier
Bridge Amplifier - page 6
Power Supplies
Shut Off Mechanism
Headphones
Calculating Wattages
PC Boards - page 7
Current Amplifier Board
Board for Quad Input Amplifier
Soldering
Switches
Back Panel
Plates for Current Amplifiers
Boxes
Harmonic Distortion

The Usual Audio Amplifier
Figure 1. Current Amplifier
Figure 2. 40V Current Amplifier for Audio
Figure 3. Basic Audio Amplifier
Figure 4. Over-wattage Protection
Figure 5. Low Impedance Audio Amplifier
Figure 6. Nonsplit Power Supplies
Switching for 10W Amplifier, Mechanical
   and Electronic Forms
CMOS Switching
Digital Switching
Balance and Tone Controls
Quad Input Amplifier
High Voltage Current Amplifier
Switching for 90V Amplifier
Preamp Gating
Digital Circuits for 90V Amplifier
Delay Mechanism
Simplified Alternative
Decoder Pinouts
Line Selectors
Gain Switching
Digital Board
Digital Board Headers
Board for 90V Amplifier
Bridge Amplifier Circuits
Power Suppy Circuits
Shut Off Mechanism
Headphone Current Amplifier
Current Amplifier Board
Board Pattern for Quad Input Amplifier
Plates for Current Amplifiers
Boxes
Beta test
Pin Connections
Tutorial