[450] "The Link" interface board

[Bob]

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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