[450] "The Link" interface board

[John Foege]

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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