[GreenKeys] John Nagle's USB <-> 60 mA loop board

[Bruce Phillips]

Hi Sam,

Thanks. I've got enough components to make up 20 pcb's (less the 
connectors and switches) on their way.

I don't want to talk money until I have a board built, and have the 
interface up and running.

As soon as that happens I'll update, and provide some photo's.

Thanks again,

Bruce Phillips



On 6/03/2018 1:58 PM, Sam Stinson wrote:
> Hi Bruce - mark me down as interested in 3 of these, if the cost will 
> be say, not more than $150 per.
> I’d be happy to front some money to you as well to help out on 
> ordering the BOM, if that would be helpful.
>
> On Mar 5, 2018, at 17:07, Bruce Phillips <bruce at ecsindustries.com 
> <mailto:bruce at ecsindustries.com>> wrote:
>
>> Hello All,
>>
>> As previously mentioned, I have planned to make some of John Nagle's 
>> USB <-> 60mA Loop Converters.
>>
>> Please read this in full, and have patience with this build.......I 
>> have a few other things on my plate.
>>
>> My initial plan was to have enough parts to build 20 PCB's and have 
>> 10 PCB's for anyone who wished to buy one.
>>
>> I have noted all those who have expressed interest, and in the next 
>> few days I'll make up a web page with the status and who want's 
>> what.....I don't want to clutter up the Greenkeys forum with this.
>>
>> The prices given are as a guidance only, and this is an evolving, 
>> work in progress....when I make the first unit, and make sure it 
>> works for me I can then finalize the prices, and begin assembling 
>> more as required.....if there is a demand I don't mind doing more 
>> batches in the future.
>>
>> The full design, and all details are freely available on John Nagle's 
>> github space here: https://github.com/John-Nagle/ttyloopdriver
>>
>> John's design is for the most part SMD (Surface Mount). As John as 
>> previously mentioned components like the LT3750 charge controller are 
>> not available in a through hole version.
>>
>> Today 6th of March 2018, 30 Circuit boards arrived. Here is a photo 
>> of what they look like:
>>
>> <TTYPCB.jpg>
>>
>> These circuit boards cost approx $6 each + Postage cost from 
>> Melbourne, Australia.
>>
>> Some of the components are slightly obscure, and there is not one 
>> place where everything can be obtained in one hit.
>>
>> With that in mind, and trying to keep the build cost down, I have 
>> sourced components from 7 different suppliers.
>>
>> This is what a fully build PCB would look like (Note the CP2102 is 
>> not shown as there is no 3d outline in kitcad for it):
>>
>> <ttydriver00.jpg>
>>
>> <ttydriver01.jpg>
>>
>> <ttydriver02.jpg>
>>
>> With regard to components, approx $26 is consumed on the Switchcraft 
>> 1/4" jacks (J1, J2), Switch (SW1), Push Button (SW2), LED's (LED_3) 
>> and 3.5mm jack (J3).
>> The remainder of the other components come in at approx $58.....If 
>> you plan to mount the unit into your own enclosure then I have 
>> sourced some more
>> cost effective panel mount versions of the switch, button, led's and 
>> jacks, which will only be about $15. I have not costed the Hammond 
>> enclosure, as I will not be using it.
>>
>> I hope to be able to offer a fully built and tested unit to members 
>> of the Greenkeys forum for approx $100 +postage (if there is any 
>> interest).
>>
>> Please note that these figures are still not confirmed, but are close 
>> to the mark.
>>
>> At present I am waiting on 3 orders of components to do an initial 
>> build, and test the board for myself....all going well the components 
>> will all arrive this week.
>>
>> Again, please give me a chance to actually build and test a unit, 
>> then I can finalize the exact costs.
>>
>> Thanks,
>> Bruce Phillips
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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