Answers.Body: <p>We can begin to explore this part by carefully removing the top cover to reveal the PCB:</p>
  <p><a href="https://i.sstatic.net/1cw2X.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/1cw2X.jpg" alt="Top with cover removed" /></a></p>
  <p>On the left, we can see a current-limiting thermistor (<a href="https://www.bourns.com/pdfs/mfmsmf.pdf" rel="nofollow noreferrer">MF-MSMF075</a>). On the right, we have a pair of Powered Up connectors. In between the connectors, there is a surface mount LED labelled D1 that is used as a power indicator.</p>
  <p>Let's remove the PCB:</p>
  <p><a href="https://i.sstatic.net/QiYzk.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/QiYzk.jpg" alt="Top with PCB removed" /></a></p>
  <p>Under the PCB, there are a couple of metal springs. These provide the physical resistance and locking capabilities for the switch but perform no electrical function.</p>
  <p><a href="https://i.sstatic.net/5kZUi.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/5kZUi.jpg" alt="Top with spring removed" /></a></p>
  <p>That's the main housing without the springs present.</p>
  <p>Let's look at the bottom of the PCB:</p>
  <p><a href="https://i.sstatic.net/nNhuf.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/nNhuf.jpg" alt="PCB bottom with switch contacts" /></a></p>
  <p>This clearly shows how the electrical side of the switches are implemented. The two components on the right are usually in contact with the board and are allowed to slide to make or break contact with the contacts shown on the board. A quick examination of the traces shows that the contacts are used as DPDT switches that are wired as crossovers to allow polarity reversal.</p>
  <p>Overall, this is a very basic basic battery box much like those for older systems such as <a href="https://rebrickable.com/parts/16511/battery-box-power-functions-4-x-11-x-7-with-orange-switch-and-dark-bluish-gray-covers-new-version/" rel="nofollow noreferrer">Power Functions</a>, with the exception that this box allows two motors to be controlled independently.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-12-20T16:49:40.573Z
Answers.Text: "On the left, we can see what I believe is a current-limiting thermistor."
  
  Looks like a Bourns MF-MSMF Series - PTC Resettable Fuse. The same is used in other Powered Up hubs.
Answers.UserDisplayName: David Lechner
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-12-20T16:51:43.017Z
Answers.Text: Is D1 a power indication light?
Answers.UserDisplayName: David Lechner
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-12-20T20:23:29.040Z
Answers.Text: @DavidLechner D1 is the power LED. Thanks for the note about the fuse. I've added a link to the datasheet in the answer.
Answers.UserDisplayName: jncraton
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-12-19T23:46:13.197Z
Answers.LastActivityDate: 2022-12-20T20:22:16.087Z
Answers.LastEditDate: 2022-12-20T20:22:16.087Z
Answers.UserDisplayName: jncraton
Body: <p>What's inside the <a href="https://rebrickable.com/parts/85825/hub-powered-up-2-port-non-bluetooth-screw-opening/" rel="noreferrer">non-Bluetooth Powered Up Hub (85825)</a>?</p>
  <p><a href="https://i.sstatic.net/wQxbY.png" rel="noreferrer"><img src="https://i.sstatic.net/wQxbY.png" alt="Hub Render" /></a></p>
  <p>In particular, what sort of electronic components are present?</p>
  
Tags: <powered-up>
Title: What's inside the non-Bluetooth Powered Up hub?
UserDisplayName: jncraton
ThreadText: # What's inside the non-Bluetooth Powered Up hub?
  
  (Asked by: username_0 on 2022-12-19)
  
  What's inside the [non-Bluetooth Powered Up Hub (85825)](https://rebrickable.com/parts/85825/hub-powered-up-2-port-non-bluetooth-screw-opening/)?
  
  [![Hub Render](https://i.sstatic.net/wQxbY.png)](https://i.sstatic.net/wQxbY.png)
  
  In particular, what sort of electronic components are present?
  
  **Tags:** powered-up
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_0 on 2022-12-19. Score: 10 | Accepted answer
  
  We can begin to explore this part by carefully removing the top cover to reveal the PCB:
  
  [![Top with cover removed](https://i.sstatic.net/1cw2X.jpg)](https://i.sstatic.net/1cw2X.jpg)
  
  On the left, we can see a current-limiting thermistor ([MF-MSMF075](https://www.bourns.com/pdfs/mfmsmf.pdf)). On the right, we have a pair of Powered Up connectors. In between the connectors, there is a surface mount LED labelled D1 that is used as a power indicator.
  
  Let's remove the PCB:
  
  [![Top with PCB removed](https://i.sstatic.net/QiYzk.jpg)](https://i.sstatic.net/QiYzk.jpg)
  
  Under the PCB, there are a couple of metal springs. These provide the physical resistance and locking capabilities for the switch but perform no electrical function.
  
  [![Top with spring removed](https://i.sstatic.net/5kZUi.jpg)](https://i.sstatic.net/5kZUi.jpg)
  
  That's the main housing without the springs present.
  
  Let's look at the bottom of the PCB:
  
  [![PCB bottom with switch contacts](https://i.sstatic.net/nNhuf.jpg)](https://i.sstatic.net/nNhuf.jpg)
  
  This clearly shows how the electrical side of the switches are implemented. The two components on the right are usually in contact with the board and are allowed to slide to make or break contact with the contacts shown on the board. A quick examination of the traces shows that the contacts are used as DPDT switches that are wired as crossovers to allow polarity reversal.
  
  Overall, this is a very basic basic battery box much like those for older systems such as [Power Functions](https://rebrickable.com/parts/16511/battery-box-power-functions-4-x-11-x-7-with-orange-switch-and-dark-bluish-gray-covers-new-version/), with the exception that this box allows two motors to be controlled independently.
  
  > **Comments:**
  > **username_1**: "On the left, we can see what I believe is a current-limiting thermistor."  Looks like a Bourns MF-MSMF Series - PTC Resettable Fuse. The same is used in other Powered Up hubs.  
  > **username_1**: Is D1 a power indication light?  
  > **username_0**: @username_1 D1 is the power LED. Thanks for the note about the fuse. I've added a link to the datasheet in the answer.  
  
  ---
  
  