File:UPC1237 speaker protection 2. Decrease relay current with RC.png
From Wikimedia Commons, the free media repository
Jump to navigation
Jump to search
![File:UPC1237 speaker protection 2. Decrease relay current with RC.png](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d6/UPC1237_speaker_protection_2._Decrease_relay_current_with_RC.png/800px-UPC1237_speaker_protection_2._Decrease_relay_current_with_RC.png?20230112054138)
Size of this preview: 800 × 413 pixels. Other resolutions: 320 × 165 pixels | 640 × 330 pixels | 1,024 × 528 pixels | 1,553 × 801 pixels.
Original file (1,553 × 801 pixels, file size: 169 KB, MIME type: image/png)
File information
Structured data
Captions
Captions
Add a one-line explanation of what this file represents
Summary
[edit]DescriptionUPC1237 speaker protection 2. Decrease relay current with RC.png |
English: Use of uPC1237 speaker protection IC. 2. Improving current draw by adding RC ballast into relay drive path. With parts shown, relay current decreases from 20..30 mA (depending on rail voltage) to 6...9 mA. The diode D2 speeds up discharge of C5 at power-off. Update: The turn-on delay network R5C4 (same as in datasheet) considerably slows down the turn-on transient of the uPC1237's output transistor. This requires a fairly hefty C5 of at least 470uF. With 220uF the circuit may not work correctly, to the point where the relays won't turn on at all. The only way to ensure relay turn-on is to increase C5 to 470 uF; this certainly works with 100 uF timing cap. Likewise, if you feel like increasing turn-off delay, increase C5 accordingly. |
Date | |
Source | Own work |
Author | Retired electrician |
Licensing
[edit]I, the copyright holder of this work, hereby publish it under the following license:
![]() ![]() |
This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 05:41, 12 January 2023 | ![]() | 1,553 × 801 (169 KB) | Retired electrician (talk | contribs) | upd |
00:42, 10 December 2022 | ![]() | 1,534 × 809 (150 KB) | Retired electrician (talk | contribs) | {{Information {{Information |Description={{en|Use of uPC1237 speaker protection IC. 2. Improving current draw by adding RC into relay drive path. The diode D2 speeds up discharge of C5 at power-off. }} |Source={{own}} |Date=2022-12-10 |Author= Retired electrician |Permission= |other_versions= }} Category:UPC1237 |
You cannot overwrite this file.
File usage on Commons
The following page uses this file:
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Horizontal resolution | 47.24 dpc |
---|---|
Vertical resolution | 47.24 dpc |
Hidden categories: