Showing posts with label volume. Show all posts
Showing posts with label volume. Show all posts
Wednesday, September 10, 2014
Digital Volume Control
This schema could be used for replacing your manual volume control in a stereo amplifier. In this schema, push-to-on switch SW1 controls the forward (volume increase) operation of both channels while a similar switch SW2 controls reverse (volume decrease) operation of both channels. A readily available IC from Dallas semiconductor, DS1669 is used here.
Parts:
J1 = RCA Audio Input Socket J2 = RCA Audio Input Socket C1 = 0.1uF-16V Ceramic Disc Capacitor C2 = 0.1uF-16V Ceramic Disc Capacitor C3 = 0.1uF-16V Ceramic Disc Capacitor IC1 = DS1669 (is available from Dallas SCo. SW1 = Momentary Push Button Switch SW1 = Momentary Push Button Switch
Notes:
* Replaces mechanical variable resistors. * Electronic interface provided for digital as well as manual control. * Wide differential input voltage range between 4.5 and 8 volts. * Wiper position is maintained in the absence of power. * Low-cost alternative to mechanical controls. * Applications include volume, tone, contrast, brightness, and dimmer control. * The schema is extremely simple and compact requiring very few external components. * The power supply can vary from 4.5V to 8V. * The input signal should not fall below -0.2 volts.
Sunday, August 17, 2014
11W 11W AMPLIFIER WITH DC VOLUME CONTROL
General Description:
TDA7495 is a stereo 11+11W class AB power amplifier assembled in the @ Multiwatt 15 package, specially designed for high quality sound, TV applications. Features of the TDA7495 include linear volume control, Stand-by and mute functions.
Circuit Diagram:
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| TDA7495 circuit diagram |
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