Jump to content
Ksarul

HRD 4000B

Recommended Posts

On 5/3/2020 at 4:35 PM, InsaneMultitasker said:

Posted the 'final' user operating manual update for 8.42c in the dev topic.

 

Thank you. I had been looking for this.

Share this post


Link to post
Share on other sites
On 5/23/2020 at 2:48 AM, Ksarul said:

Four of the first six completed boards are already spoken for. I'm busy assembling eight more now. Answer here if you are still interested in purchasing one of the boards. The price is $185 plus $15 for a flat rate box to US addresses (somewhat more for postage to the rest of the world). The box can hold two assembled cards safely for those looking to purchase more than one card.

 

Bare boards are still $30 each, and include one 74HCT154 and six D7K diodes. One note on the diodes--check them with a meter so you are sure which end is which, as the truth is a bit counter-intuitive. The double white lines equate to the marked end of a US diode. . .not the single red line.

I would like one if they are not already all spoken for, otherwise will have to wait! Thanks.

Share this post


Link to post
Share on other sites

Started the soldering work on my board today.  According to the construction guide C17 & C25 are .1uF capacitors, but the silkscreen on the board indicates 10uF tantalum capacitors.  I assume the silkscreen is correct and the draft guide is not up to date.  Can I get a verification on this, please?

Share this post


Link to post
Share on other sites
17 hours ago, klrw111-78 said:

Started the soldering work on my board today.  According to the construction guide C17 & C25 are .1uF capacitors, but the silkscreen on the board indicates 10uF tantalum capacitors.  I assume the silkscreen is correct and the draft guide is not up to date.  Can I get a verification on this, please?

The silkscreen is correct--and there are three changed capacitors, not two. C-10 is also 10uF. I'm pretty sure I corrected that bit in the final version of the manual, but I will look again to be sure. Note, that C-10, C-17, and C-25 are ceramics, not tantalums. There are three 10uF tantalum caps on the board, but they are C-1, C-2, and C-3.

Share this post


Link to post
Share on other sites
The silkscreen is correct--and there are three changed capacitors, not two. C-10 is also 10uF. I'm pretty sure I corrected that bit in the final version of the manual, but I will look again to be sure.

Thanks. Thought I downloaded the latest guide in this thread.

 

 

Sent from my iPad using Tapatalk

Share this post


Link to post
Share on other sites
On 6/10/2020 at 9:45 PM, Ksarul said:

I'm attaching the final version (along with the schematics) here. Hopefully that helps you and others building their own boards.

HRD 4000B Construction Guide (Final-2).pdf 4.53 MB · 28 downloads A3-Horizon 4000B RAMDisk Schematics (Final-1).pdf 300.3 kB · 23 downloads

Thanks to your construction guide and schematics, I managed to assemble a working board without any rework. 

 

  • Like 2

Share this post


Link to post
Share on other sites
3 hours ago, klrw111-78 said:

Thanks to your construction guide and schematics, I managed to assemble a working board without any rework. 

 

I'm glad you had fun building it!

  • Like 2

Share this post


Link to post
Share on other sites

If you guys ever do a Rev C of this device, I found an interesting paper (Done by a TI engineer, no less!) concerning using NiMH cells in place of a LiON cell.

 

https://www.ti.com/lit/an/slyt468/slyt468.pdf?ts=1592939777738&ref_url=https%3A%2F%2Fwww.google.com%2F

 

That would let you drop in some inexpensive COTS rechargeable AA batteries, instead of the more expensive LiON cell it was specc'd with.

Share this post


Link to post
Share on other sites
5 hours ago, wierd_w said:

If you guys ever do a Rev C of this device, I found an interesting paper (Done by a TI engineer, no less!) concerning using NiMH cells in place of a LiON cell.

 

https://www.ti.com/lit/an/slyt468/slyt468.pdf?ts=1592939777738&ref_url=https%3A%2F%2Fwww.google.com%2F

 

That would let you drop in some inexpensive COTS rechargeable AA batteries, instead of the more expensive LiON cell it was specc'd with.

Actually, this board will already work with Alkalines, LiON, NiCd, or NiMH. All are valid, configurable options. Alkalines and LiON disable the charge circuit to protect the batteries, while the other two use the charge circuit. No revision C necessary. :)

  • Like 3

Share this post


Link to post
Share on other sites

So NiMH-AAA's should work as replacement for NiCd's on my HRD2000.  With no changes to the power circuit?  I pulled the old NiCD's as they we starting to leak.

Share this post


Link to post
Share on other sites

I personally stay with the NiCD batteries, as the circuit was originally set up for them, but others have used NiMH batteries without problems. All of the boards I build have NiCD batteries installed.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...