1/29/2024 0 Comments Clipping detector led![]() The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. Some applications may need different response rates you can easily obtain them by following the design equations above. The decay time in this case is 250 msec, because that value produces a pleasing-looking bar-graph display. This time equals (R 2 +R 3 )C 1 (assuming that R 1 is negligibly small compared with R 2 +R 3 ). The decay time is the time it takes the peak to decay to 31% of its original value, or one time constant. In this circuit, the attack time is 1 msec. The time constant R 1 C 1 sets the attack time. “Attack time” is the time it takes the peak detector to respond to 69% of an input-signal peak, or one time constant. Nominal, full-scale line input of 200 mV rms lights two of the green LEDs. This value is convenient for this application, which uses three green LEDs, two yellow LEDs, and one red LED to show the relative peak levels of the stereo channels. For a full-scale 200-mV- rms input, this gain produces an output of approximately 1.4V. The gain for both stereo channels is equal to 1+R 2 /R 3. Your personal preference or exact needs might require other performance parameters, and you can easily adjust these values. The values shown in Figure 1 are for standard 200-mV-rms line-input levels, such as those you'd find on a PC's sound-card line input. Also, because the diodes have an OR connection, the circuit detects only the larger peak from the left or right stereo input. The dual diode, D 1, serves to allow positive peaks to pass while disconnecting the op amp from the hold capacitor, C 1, on negative peaks. The circuit operates as a dual positive-peak-detector circuit. The output is suitable for driving a bar-graph display or for analog-to-digital conversion and display with a microprocessor. ![]() All the adjustments in the circuit simultaneously apply to both left and right stereo inputs. The design is unique in that it detects both stereo channels on a single peak-hold capacitor. The simple peak detector in Figure 1 is the result of a need for a single-5V-supply, level/clipping indicator for a multimedia-PC sound system.
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