1.5W Audio power amplifier (12V)
1.5W Audio power amplifier (12V) circuit

10 Band Audio Equalizer
10 Band Audio Equalizer circuit

100W Audio Amplifier
100W Audio Amplifier circuit

100W Guitar Amplifier
100W Guitar Amplifier circuit

100W RMS Amplifier
100W RMS Amplifier circuit

10W Audio Amplifier with Bass-boost
10W Audio Amplifier with Bass-boost circuit

10W Audio Power Amplifier
10W Audio Power Amplifier circuit

10W Mini Audio Amplifier
10W Mini Audio Amplifier circuit

16w Bridge Amplifier
16w Bridge Amplifier circuit

18W Audio Amplifier
18W Audio Amplifier circuit

1W Bass Power Amplifier
1W Bass Power Amplifier circuit

200W audio amplifier
200W audio amplifier circuit

20W Power Amplifier
20W Power Amplifier circuit

22 Watt Audio Amplifier
22 Watt Audio Amplifier circuit

22W Stereo Amplifier
22W Stereo Amplifier circuit

250 mW Audio Amplifier
250 mW Audio Amplifier circuit

25W Mosfet audio amplifier
25W Mosfet audio amplifier circuit

3 Channel Spectrum Analyzer
3 Channel Spectrum Analyzer circuit

3 Line Mixer
3 Line Mixer circuit

3 Transistor Audio Amp (50 milliwatt)
3 Transistor Audio Amp (50 milliwatt) circuit

5 band graphic equalizer using a single IC/chip
5 band graphic equalizer using a single IC/chip circuit

5 Watt Class-A Audio Amplifier
5 Watt Class-A Audio Amplifier circuit

50 Watt Amplifier
50 Watt Amplifier circuit

60W Bass Amplifier
60W Bass Amplifier circuit

60W Guitar Amplifier
60W Guitar Amplifier circuit

Amplified Ear
Amplified Ear circuit

Amplifier 2x30W with STK465
Amplifier 2x30W with STK465 circuit

Amplifier of acoustic frequencies with preamplifier
Amplifier of acoustic frequencies with preamplifier circuit

Audio Distribution Amplifier
Audio Distribution Amplifier circuit

Audio Visual Indicator for Telephones
Audio Visual Indicator for Telephones circuit

Automatic Loudness Control
Automatic Loudness Control circuit

Bass-treble tone control circuit
Bass-treble tone control circuit circuit

Bass-treble tone control circuit
Bass-treble tone control circuit circuit

Baxendall Tone Control
Baxendall Tone Control circuit

Classic Audio Mixer
Classic Audio Mixer circuit

Digital Volume Control
Digital Volume Control circuit

Digital Volume Control
Digital Volume Control circuit

Digital Volume Control
Digital Volume Control circuit

Electret Microphone Pre-Amplifier
Electret Microphone Pre-Amplifier circuit

Electronics Attenuator
Electronics Attenuator circuit

FET Audio Mixer
FET Audio Mixer circuit

Guitar Amplifier
Guitar Amplifier circuit

Headphone Amplifier
Headphone Amplifier circuit

Improved 3 Transistor Audio Amp (80 milliwatt)
Improved 3 Transistor Audio Amp (80 milliwatt) circuit

Infrared Head Phones
Infrared Head Phones circuit

Low cost intercom using transistors
Low cost intercom using transistors circuit

Low impedance microphone amplifier
Low impedance microphone amplifier circuit

Mini-box 2W Amplifier
Mini-box 2W Amplifier circuit

Musical Instrument (Expandable) Graphic Equaliser
Musical Instrument (Expandable) Graphic Equaliser circuit

Phono Preamplifier
Phono Preamplifier circuit

Portable Headphone Amplifier
Portable Headphone Amplifier circuit

Portable Microphone Preamplifier
Portable Microphone Preamplifier circuit

Portable Mixer
Portable Mixer circuit

Precision Audio Millivoltmeter
Precision Audio Millivoltmeter circuit

Simple Intercom
Simple Intercom circuit

Sound Controlled Filp Flop
Sound Controlled Filp Flop circuit

Sound Level Meter
Sound Level Meter circuit

Sound Pressure Level Meter
Sound Pressure Level Meter circuit

Speaker Microphone
Speaker Microphone circuit

Speech Recorder
Speech Recorder circuit

Stereo Channel Selector
Stereo Channel Selector circuit

Stereo Preamplifier with Bass-boost
Stereo Preamplifier with Bass-boost circuit

Stereo Tone Control
Stereo Tone Control circuit

Stereo Tube Amplifier
Stereo Tube Amplifier circuit

Surround Sound Decoder
Surround Sound Decoder circuit

Three-Level Audio Power Indicator
Three-Level Audio Power Indicator circuit

Two transistor audio amplifier circuit
Two transistor audio amplifier circuit circuit

Two way cross-over 3500 Hz
Two way cross-over 3500 Hz circuit

Ultrasonic pest repellent
Ultrasonic pest repellent circuit

Ultrasonic Switch
Ultrasonic Switch circuit