Sampling circuit

Secondary battery quick-charging circuit

Semi-active notch filter

Semiconductor integrated circuit device

Semiconductor optical amplifier

Sense amplifier

Shielded transistor device

Signal amplifier circuit using a field effect transistor having

Signal amplifier circuit with a field effect transistor having c

Signal amplifying circuit

Signal composing circuit

Signal cuber

Signal cuber circuit

Signal level control circuit

Signal processing means acting as a frequency range translator a

Single power supply battery feed circuit

Sleep-inducing/interrupting audio system

Solid state amplifier

Spectrum notcher

Speech signal A/D converter using an instantaneously-variable ba