New Audio Amplifiers Table of Contents Pages. Page One. Page Two. Page Three. Page Four. Page Five. Page Six. Page Seven. Topics. Introduction. page 1. How Amplifiers Work. page 0. The Current Amplifier. page 2. Ringing. The Basic Audio amplifier. Op Amp Current 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. Figures.  (Same are within text.) The Usual Audio Amplifier. Figure 1. Current Amplifier. Figure 2. 40V Current Amplifier for Audio. Figure 3. Basic Audio Amplifier. Figure opc. Op Amp Currrent 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. Electronics Home Page