[450] "The Link" interface board

[John Foege]

Looks much better on this one


On Sun, Sep 29, 2013 at 9:19 PM, David McKenzie <k1fsy at vhfwiki.com> wrote:

>
>
>
> 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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