Amplifiers

A Push-Pull Amplifier	Sound Scooper
Speaker / microphone Transistor amplifier
Hearing aid Amplifier	The big ear
Amplifier with two close-coupled transistors
Liquid Conductivity Tester
CdS Cell Light Meter with Transistor Amplifier
Super-Sensitive Photometer
The Electric Human	Lie Detector
Motion Detector	Tug of War
Light Hum and Noise Detector
Shot in the Dark
OP AMP	Circles of tree
Amplifier Classes
BA546
IC power amplifier	IC power amplifier II
Oscillator using power amplifier IC	Cds controlled IC oscillator
BA546 whit electret micro	Phase shift oscillator
Intercom	A water service pipe sound
Electronic klaxon	Wide range audio frequency oscillator
Agc circuit using a single transistor	Sound of passing siren
Light source sensing circuit by sound	Electronic piano circuit
Space gun
LM386
Intercom	Amplifier circuit with bass boost
Doorphone Intercom Circuit	Simple Megaphone
Stereo amplifier	Microphone amplifier

Electronic