Audio Amplifier Circuit
bioelectricity amplifier circuit
bridge amplifier circuit
differential operational amplifier circuit
feedback of amplifier circuit
limiting amplifier circuit
Low Noise Amplifier Circuit
Power amplifier circuit
printed circuit amplifier
sense amplifier circuit
stagger amplifier circuit
control amplifier {blanking and mixing amplifier}
log amplifier and antilog amplifier
alternation current circuit {= AC circuit}
earth circuit [= earth return circuit]