Re: LED for XMIT indication
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Pop, thanks for uploading the photo, I think adding the dual LED is a great idea. I wish I had a case like yours too! :-))
Roy WA0YMH
On Jan 4, 2017 11:32 PM, "'VU2POP' vu2pop@... [BITX20]" < BITX20@...> wrote:
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Hi , You may see the attached foto , zoom in to see the red & green wires soldered to the DIP relay points Green for Rx and Red for Tx which is fed to the dual color LED ( three terminal type) the centre goes thru a 680 ohms resisitor to gnd. happy homebrewing best 73 Pop VU2POP ? ? ? Well, I'm not sure photos would do, and it might take several. Plus there's 20 minutes of disassembly? and re-assembly - it's screwed to the box...!
However if you look at the schematic - lower left:? ... you'll see the PTT and the 'main' relay - Pins 1 and 3 are RX+12V and TX+12V, respectively.
They're even LABELLED on the schematic as RX and TX! They're not labelled on the PCB, but you can even test this with a voltmeter. Pin 1 will be +12 during receive. PTT and it will drop and TX (Pin 3) Pick off your 'GREEN' and 'RED' anodes. Most Bicolor LEDs I've seen have a common cathode, so that (center) wire is ground.?
You can pick up GROUND from this same relay - Pin 16 of the relay is ground.? ??
An even better picture can be seen from the 'wireup' page: ? ? The PTT Relay is right in front (and down a bit) from the PTT connector. PIN 1 is 'down' & 'right' (if you're looking at the wireup.html page).
There's no need to desolder or remove the relay. Just go underneath and, strip your wires SHORT.
You just need like 3 or 4 mm. Just solder to where the relay socket pins are soldered (remember they're
'reversed' on the bottom) - Pin 1 - RX, Pin 2 - TX, Pin 16 (which is opposite from Pin1 - it's a 16-pin
socket) Pin 16 is ground. You can either run it to a connector and 'crazy glue' or hot-glue to the PCB just underneath (and to the right of) the power connector - or, you can just run them in the free-air, maybe use some shrink tubing to keep them together. Just run them to your Bicolor LED.
Hope that helps.?
Now - if I have some time this weekend, I'll snap some photos. ? Mike Y
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