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The Great Search: Current-carrying Slide Switch

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Manage episode 342451408 series 1242341
内容由Adafruit Industries提供。所有播客内容(包括剧集、图形和播客描述)均由 Adafruit Industries 或其播客平台合作伙伴直接上传和提供。如果您认为有人在未经您许可的情况下使用您的受版权保护的作品,您可以按照此处概述的流程进行操作https://zh.player.fm/legal
For our TCA9548 QT breakout, we're going to allow switching the QT power and signal between 3 and 5V, so it could be used for level shifting. This means the switch itself will be carrying power - we're not using a separate FET-based switch. It's reasonable for us to expect about 500mA total current among all of the 'client' boards, and we have a 500mA regulator on board to manage that. However, that switch has to be spec'd for the voltages and currents we're expecting to pass through it! It's very easy to glide over contact specs for switches if you're used to signal-only usage. Let's find a vertical switch that can handle 5V and up to 500mA total. See the chosen part on Digi-Key https://www.digikey.com/short/jdwr22pb Visit the Adafruit shop online - http://www.adafruit.com ----------------------------------------- LIVE CHAT IS HERE! http://adafru.it/discord Adafruit on Instagram: https://www.instagram.com/adafruit Subscribe to Adafruit on YouTube: http://adafru.it/subscribe New tutorials on the Adafruit Learning System: http://learn.adafruit.com/ ----------------------------------------- #adafruit #thegreatsearch #digikey @Digi-Key
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Manage episode 342451408 series 1242341
内容由Adafruit Industries提供。所有播客内容(包括剧集、图形和播客描述)均由 Adafruit Industries 或其播客平台合作伙伴直接上传和提供。如果您认为有人在未经您许可的情况下使用您的受版权保护的作品,您可以按照此处概述的流程进行操作https://zh.player.fm/legal
For our TCA9548 QT breakout, we're going to allow switching the QT power and signal between 3 and 5V, so it could be used for level shifting. This means the switch itself will be carrying power - we're not using a separate FET-based switch. It's reasonable for us to expect about 500mA total current among all of the 'client' boards, and we have a 500mA regulator on board to manage that. However, that switch has to be spec'd for the voltages and currents we're expecting to pass through it! It's very easy to glide over contact specs for switches if you're used to signal-only usage. Let's find a vertical switch that can handle 5V and up to 500mA total. See the chosen part on Digi-Key https://www.digikey.com/short/jdwr22pb Visit the Adafruit shop online - http://www.adafruit.com ----------------------------------------- LIVE CHAT IS HERE! http://adafru.it/discord Adafruit on Instagram: https://www.instagram.com/adafruit Subscribe to Adafruit on YouTube: http://adafru.it/subscribe New tutorials on the Adafruit Learning System: http://learn.adafruit.com/ ----------------------------------------- #adafruit #thegreatsearch #digikey @Digi-Key
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