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Audio-fidelity and speaker volume controls

Audio-fidelity and speaker volume controls. Articles with illustrations and detailed explanations:
5-band stereo equalizer with volume and balance control on a CXA1352AS chip
8-band EQ
A simple electronic volume control button
Active filter with gain on the operational Amplifier
Active salon resonance filter on a field and bipolar transistor
Active three-way crossover
Adder and adjustable low-pass filter for a subwoofer channel
Adder and phase shifter for a subwoofer channel on field-effect transistors and an operational Amplifier
Adder, adjustable low-pass filter and phase shifter for a subwoofer channel in field-effect transistors and an operational Amplifier
Adder, adjustable low-pass filter and phase shifter for a subwoofer channel in field-effect transistors and an operational Amplifier, bipolar power supply
Adder, adjustable low-pass filter and phase shifter for the subwoofer channel on one transistor and operational Amplifier
Combined Band-Pass Filter
Combined high-pass filter
Combined volume and tone control
Digital Voice Tone
Digital Volume Control (1)
Digital Volume Control (2)
Digital Volume Control (3)
Electronic Volume Control (1)
Electronic Volume Control (2)
Electronic volume control on the KA2250 chip
Filter unit for three-channel Alification
Filter unit for three-channel Alification and phase shifter
Five-way active tone control
Graphic equalizer on LA3607
High-pass filter for the built-in Amplifier
Multiband Filterless EQ
Parametric equalizer
Parametric tone control
Passive tone control classic full
Passive tone control Classic simplified
Passive tone control combined
Passive Tone Control for Low and High Frequency with one control
Passive tone control of the Philips 410 radio
Passive tone control with adjustable kink frequencies
Passive tone control with asymmetric characteristic of regulation
Passive tone control with variable bend frequencies classic
Passive Tone Controls
Phase Inverter for a Bridge Amplifier
Separating filters for embedding in the radio tape recorder
Shaper of two-way signal and subwoofer signal
Subsonic filter on the field and bipolar transistor
The volume and tone controls of the modern stereo system
Three-band tone control
Three-way shaper and subwoofer shaper
Threshold control signal
Timbre on A1524 chip
Tone compensated volume control combined with tone controls
Tone Register
Tone-balanced volume control with active bass correction
Tone-compensated volume control (1)
Tone-compensated volume control (2)
Tone-compensated volume control on a resistor without taps
Tone-compensated volume control on a single tap resistor (1)
Tone-compensated volume control on a single tap resistor (2)
Tone-compensated volume control with a variable resistor without taps
Tone-compensated volume control with adjustable correction depth on a single-tap resistor
Tone-compensated volume control with deep correction
Tone-compensated volume control, with separate adjustment of the correction depth on the resistor without tapping
Touch Volume Control
Tunable bandpass filter
Variable Slope Filter
Volume control with a buffer cascade
Volume control with electronic control
Volume control with touch controls
Volume, balance, and tone controls on the TDA1524A chip