[450] "The Link" interface board

[John Foege]

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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