[450] "The Link" interface board

[David McKenzie]

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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