OK, here are photos of the completed RF wiring. ? Remember, this is intentionally done in the most simplistic manner possible. ? Short, but unshielded wires. ?The red wire, the input to the whole filtering thing, just cries out for either shielding or twisted
pair treatment, but I want to see what improvement you get from even very very simple wiring. ?
The daughterboard gets grounded at at least two points. ?See the black wires heading to two of the grounding posts of the main board.
Since I clobbered one of the inductors on one of the filters, I wired to just the last two sections of that filter.?
Next is to decipher the relay control wiring and figure out where to pick up my signals there. ??
This part went much quicker than I thought it would go. ??
On Aug 28, 2018, at 18:05, Gibby,Gordon L <
ggibby@...> wrote:
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Well, here is the photo of my attempt at cutting traces with a Dremel 200 tool and a tiny little bit that looks like an end mill !!
I learned the hard way that you have to hold this thing with two hands, ?come straight vertical, and don¡¯t come anywhere close to the inductors.
I managed to touch L 14 twice, first time knocked off one of its ?wires, another time and it went ZING! ?somewhere in my room and I haven¡¯t found it yet. ???So until I find it, that filter is only going to have two sections!
Once I learn to be that careful, it wasn¡¯t very difficult. ??I ?used low speed on the Dremel tool. ?If you work really slow or you can create a denuded solder point for a trace that you needed to cut, And then solder ?to.
Because I hadn¡¯t planned this in advance, I don¡¯t have great options for mounting the board but I¡¯ll figure it out.
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On Aug 28, 2018, at 17:09, Gibby,Gordon L <ggibby@...<mailto:ggibby@...>> wrote:
Here are photos of the assembled board. ??I did break down and use shielded microphone cable for the relay control wires. ??Soldering those SMT inductors was a bit of a thrill with a Walmart soldering iron. ??As some of you suggested, I put the relays
on the ground plane side. ??The extra circuitry unused is for a regulated voltage.
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On Aug 28, 2018, at 11:53, Arv Evans <arvid.evans@...<mailto:arvid.evans@...>> wrote:
Breakout boards
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On Tue, Aug 28, 2018 at 3:51 AM Tom, wb6b <wb6b@...<mailto:wb6b@...>> wrote:
Warren thanks,
I googled around and discovered I'm not the only one trying to prototype things with tiny chips. So, thanks for pointing the Adafruit one out. I'll order the Adafruit one or see what Digi-Key has.
Tom, wb6b
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