Be patient, you'll do it. What transistor codes are you using? Check the pinout. Are the voltages correct in the decoder without the loop amplifier connected? Does the loop offset voltage change by turning the trimmer?

Thanks, seems you are spot on. I did not think to check the transistor pinout. Decoder voltages are correct.

Will have swap all of the transistors around it seems.

Any damage done by this???

Swapped those around, test voltages nearly spot on, however across the loop is showing 1.2v

The base of Q6 is showing 2.05v which is on par with the schematic saying to trim VR1.

Try to follow this, as written in the wiki: (rotate) the trimmer so that the measured DC voltage across the two loop inputs (without the loop connected) is zero.
You should see that the voltage reverts across zero when you turn the trimmer

Yes, adjusting the trimmer the lowest I can get is 1.2v

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Well, after what seems like way too long, I have this all working now. Test, test and test again, I missed afew solder connections here and there.

Is there a requirement to run coax cable from the loop amp to the decoder, or will any 2 strand wire work? I have alot of wire on hand but no coax. But I also understand the shielding may be playing into consideration here.

And, does the thickness of the loop wire matter? I plan on burying it under the track, inside PVC piping.

The cable has to match the impedance of the circuit. You need 75 ohm shielded cable and connectors to avoid as much as you can reflections and distortion of the signal. Rememeber this is 5MHz signal, radio frequency. For the loop, I've used different cables with similar results.

mv4wd , I have around some RG58 cable (50 ohm impedence). Do you think It's usable to connect amplifier to decoder (~15 m) or should I buy 75ohm cable? (RG6 ??).
Thank you.

Theory says 75ohm. I use 75 ohm TV antenna cable. If you already have 50 ohm, try it. It might work good enough. Unfortunately RF part of the project (which was designed by Howard Cano) is the most critical. Bad connections or solder joint , wrong connectors or cable will degrade the signal enough to make the system not work. I suggest that you stick to theory as much as you can.

Good afternoon, my PSOC board arrived today and I've already installed the firmware on it, it's only missing the 5Mhz crytal so I can continue installing the other components.
The part that goes to the loop amp is done.
I have 4k resistance as mentioned in the first posts but my voltages are a little different at the measurement points of the electrical scheme, it is not a huge difference but it exists, for example in tp11 / tp10 it should be 0.39v it is measuring 0.45v .
I'm measuring without the loop amplifier turned on, because I chose to make the system with the mla30+ and it still hasn't arrived.
Should I worry about something? or can i put the psoc in the circuit and start testing?

As you see in the schematic, with my USB power TP3 was at 4,76 instead of 5, so you measure a little higher should not be a problem. It' good that they're matched. If you have a variable transformer try to lower a little.. Anyway I think you're in the ballpark

Thanks mv4wd, I will organize some 75ohm coax cable and BNC connectors. Yes that makes sense it needs to be of the same impedance of the circuit.

This was the first step in building my backyard RC track, now the real fun begins!

Does anyone know if the AMBrc serial emulation protocol works with current versions of the Live Timing software? I only just realized that protocol is an option.

Segue meu primeiro protótipo rs.
Estou preocupado pois tenho alguma tensão de referência que divergem do esquema elétrico, apesar da resistência bater 100% conforme o primeiro post.
Falta o cristal de 5mhz, que não encontrei no Brasil e tive que comprar na China, então não posso ligar para fazer alguns testes preliminares. Se não funcionar, levo para um amigo que trabalha com eletricona para remontar o circuito para mim.
Eu realmente quero que funcione, somos um clube pequeno (4 pessoas lol) então não temos dinheiro para comprar um sistema comercial.
Obrigado a todos pelo apoio.
tps://ibb.co/chcLVZx
tps://ibb.co/C5qNg1xcomplete the link to see the images I still have few posts and I can't attach images