File:Hitachi HA12157 Dolby B-C IC wired with Arduino Leonardo Pro.jpg

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English: Dolby B/C proto board with the Hitachi HA12157 IC. It needs an external microcontroller to initialize and change modes, hence the outboard Arduino Leonardo (well, a Chinese knockoff), bottom left and an associated 7809 regularor, bottom right. The passive complement of the HA12157 is as per reference design, with 1% styrene caps (pale green blocks) and 1% metal film resistors. An Arduino also provides test audio signals (not wired here yet). The Dolby IC has pin spacing of 1.778 mm (which is exactly the square root of 2.54) - that's why it was mounted diagonally.
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Author Retired electrician

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current00:54, 28 November 2020Thumbnail for version as of 00:54, 28 November 20201,400 × 2,100 (968 KB)Retired electrician (talk | contribs){{Information |Description={{en|Dolby B/C proto board with the Hitachi HA12157 IC. It needs an external microcontroller to initialize and change modes, hence the outboard Arduino Leonardo (well, a Chinese knockoff), bottom left and an associated 7809 regularor, bottom right. The passive complement of the HA12157 is as per reference design, with 1% styrene caps (pale green blocks) and 1% metal film resistors. An Arduino also provides test audio signals (not wired here yet) }} |Source={{own}} |...

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