[450] "The Link" interface board

[David McKenzie]

On Sun, Sep 29, 2013 at 2:27 PM, David McKenzie <k1fsy at vhfwiki.com> wrote:

> I'm not really sweating it. I did find some problems on that Rev tho that
> when I fixed it made the audio trace shorter and saner. For 12 bucks for 3
> I'm not going to get upset about having to re order.
>
> Parts came out to about 10 bucks pp plus 4 for the board isn't too bad.
> Plus I can sell one to Chris for his micro link!
>  On Sep 29, 2013 2:20 PM, "John Foege" <john.foege at gmail.com> wrote:
>
>> Nice...never heard of it. BatchPCB was the best I could find 4 years ago
>> or so....but you know the whole "maker" community probably has opened up a
>> lot of doorways. Some of those autoroute traces are looking mighty sketch.
>>
>> Not much clearance between the traces and no ground planes !!! I hope
>> crosstalk on the audio lines and noise is not an issue....*skerred*
>>
>> What's the turn around time on the boards?
>>
>>
>> On Sun, Sep 29, 2013 at 8:16 PM, David McKenzie <k1fsy at vhfwiki.com>wrote:
>>
>>> u betcha!
>>>
>>> osh park is cheaper than batchpcb with no setup fee and free shipping to
>>> boot.
>>>
>>>
>>> On Sun, Sep 29, 2013 at 1:45 PM, John Foege <john.foege at gmail.com>wrote:
>>>
>>>> Auto-route FTW !!!
>>>>
>>>>
>>>> On Sun, Sep 29, 2013 at 4:24 PM, Bob <n1ujs at toast.net> wrote:
>>>>
>>>>> Gotcha
>>>>>
>>>>>
>>>>>
>>>>> On Sun, Sep 29, 2013 at 10:21 AM, David McKenzie <k1fsy at vhfwiki.com>wrote:
>>>>>
>>>>>> I figured it either turned invisible or was ultimately made up and
>>>>>> was thus illusive!
>>>>>>
>>>>>> =D
>>>>>>
>>>>>> Some pics which I thought I attached to the first message
>>>>>>
>>>>>>
>>>>>> On Sun, Sep 29, 2013 at 10:13 AM, David McKenzie <k1fsy at vhfwiki.com>wrote:
>>>>>>
>>>>>>> In anticipation of assembling the link in some sort of "final"
>>>>>>> configuration, I decided that in lieu of the illusive Nomic that was
>>>>>>> originally destined for this project I would put together a plug-in board
>>>>>>> for the RasPi that has similar features.
>>>>>>>
>>>>>>> I have 3 copies of the board being printed (at the bargain price of
>>>>>>> $15). It exposes seven GPIO ports for PTT and other features of the radio
>>>>>>> that may or may not need to be controlled, and the pins from the header
>>>>>>> also allow for "green wire" mods for analog or digital inputs if necessary.
>>>>>>>
>>>>>>> It also has +5V/GND connection to power the raspi from an external
>>>>>>> powersupply/voltage converter rather than USB.
>>>>>>>
>>>>>>> There are two 3.5" stereo phone plugs, one plugs into "audio out"
>>>>>>> from the RasPi itself, the other is for a monitor speaker if desired. Audio
>>>>>>> from the rig to the RasPi is to connect directly to the USB sound dongle
>>>>>>> (not in the schematic), and audio/ptt out to the rig is via an RJ45 jack
>>>>>>> with jumpers to select which pins do what. The audio from the RasPi to the
>>>>>>> radio goes through an isolation transformer and can be varied in level by a
>>>>>>> 10k pot. I "borrowed" the audio circuit from the Nomic schematic (it's
>>>>>>> identical to pretty much every other rig audio interface circuit I saw as
>>>>>>> well), so hopefully it works out ok.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
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>>>>>>
>>>>>>
>>>>>
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>>>>>
>>>>>
>>>>
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>>>
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>>
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