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File:Arduino-based wow-and-flutter meter schematic.png

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Arduino-based wow-and-flutter meter - schematic

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English: Arduino-based wow-and-flutter meter - schematic. The outputs - 3.1 kHz oscillator and PWM to an external analog meter, and the battery monitor resistors R9-R10 - are optional. Uses a standard LCD display based on Hitachi HD44780 via the stock LiquidCrystal library (slow but it works). The choice of Arduino I/O pins is completely arbitrary, whatever fits your layout, except for the critical timer pins 6, 8 and 11 (associated wiring marked in red for input and green for output). Power can be either 2x lithium cells (7..8.5V) or 9-volt alkaline, although the LM358 stage remains so-so operational even at +5V supply.
Note that there are many fake Chinese LM358s on the market, and these are even slower than the original and won't produce the required pulse edges. I only tested it with second-source but good quality LM358s.
Русский: Измеритель детонации (магнитофонов и ЭПУ) на основе ардуино. Схема обвеса. Выходные цепи тестового генератора и ШИМ-выхода на внешний микроамперметр, и резисторы монитора напряжения батереи R9-R10 - опция. Выбор ног ардуины совершенно произвольный, как удобнее в конкретном макете - за исключением выводов таймера (ноги 6, 8, 11). Питание - от двух литиевых банок (7...8,5В) или одной 9-вольтовой батарейки, впрочем, входной усилитель на LM358 сохраняет кое-какую работоспособность и при питании +5В.
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Source Own work
Author Retired electrician

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I, the copyright holder of this work, hereby publish it under the following license:
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current17:03, 1 June 2023Thumbnail for version as of 17:03, 1 June 20234,693 × 1,729 (245 KB)Retired electrician (talk | contribs)
12:38, 1 June 2023Thumbnail for version as of 12:38, 1 June 202314,017 × 5,121 (1.19 MB)Retired electrician (talk | contribs)Uploaded own work with UploadWizard

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