RELIC HAWK

[ivconic]

RRRRRrrrrrrr
I get mad.When I say there is mistake.After finished this whit only new parts and enthusiasm!There must be.I now you cant spot it maybe because of your skills but there is!I have to correct the PCB now then test again and later the results.........

I spent hours trying to locate any possiblle mistake on my pcb...without success. So...if you know something we dont, it would be fair you to inform us here..right?
If you say "..there must be..", than this means you are 100% sure and you know where and what is, right?
So..tell us here about mistake you know about.
Regards!

[robopatt]

Sorry.
I didn't mean to insult you.
Just try with changes I spotted but no change.Now will have to wait for another chance to test with musketeer coil.And in same time will try other coils.I also spend many hours trying to spot a mistake.And with no luck.
Maybe porkluvr is right.But I have used BC557C there.
I am not 100% shore

[ivconic]

Dont be sorry, i havent understand your post as insult.
I am just very interested and curious about this long term RH issue. Same as you, i also want to disclose all the "secrets" about this project.
You are very right at some points. This not supposed to be very specific or very critical design. Must be simillar as any other; to have more tolerance and to start working even if we make it with some tolerances.
Mostly i draw my schematic respecting previous one...i think Max posted a while ago. That schematic (Max's) i guess is proven already. I only omitted mode switching parts and choosed S mode only. That is all i done.
So.. i understand your points and also want to solve it.
My pcb is not ready yet. Shame. I had so much other things to do latelly and couldnt manage to finish it. Hopefully these days i will finish it and try... than i can take more serious part in this discussion.
Regards!

[ivconic]

Look this shot. It is so clear those two are BC547 and BC557...
Third one ( and probably most important one) is smt...and i can not see any label...hmmm...

[robopatt]

This will clear any doubts.I will be glad if we make it work.
It will be great progress.
Do you now what are conections inside the coil.I mean is there conection between TX and RX ends?
I connct coil directly to PCB TX to TX and RX to RX.
Hope you understand my question.

[ivconic]

I do.
Right now i have original RH coil and 6 (!!!) various Excelerator coils for RH and Musketeer, here at my place. Those are right in front of me now.
I can only check any eventual connections via coil connector, with multimeter...right?
So... no connections at all between RX and TX.
I measured only resistances and inductances of RX's and TX's on all coils.
Those are:
from 2.1 to 3.0 ohms for TX and 1mH for all,
from 32.9 to 34 ohms for RX and 15mH for all...

[robopatt]

Just had to be shore.
So now we stuck to that Q1.

[ivconic]

I am expecting Musketeer Colt or XS soon to get. Maybe in 2 weeks. Than i will disect it completelly and find out all possible datas about that smt transistor...
Until than..

[robopatt]

Hahaha
So end of story.I am shore you will find the secret.
I will check the posts.And look for progress.
Wish you luck.

[porkluvr]

Diode D1 is turned around backwards in Ivconic's last drawing (on page 32). This was a 3V3 zener in a previous schematic. If you remove the diode completely you should still have an output but if you turn the diode backwards you will be dissapointed. I use 1N746 in the simulation.

Also, the 10k and 27k resistor on the base of NPN Q3 have been switched. It will still run, but you will have much lower distortion if the 10k goes to ground and 27k goes to the coil.

Anybody benefiting from my armchair troubleshooting should make a deposit to my paypal account. 30e would do it. I've never seen an e before! 30 would be NICE!

Just kidding (alright, you can owe me).

[ivconic]

That makes sense.
Thanks!
Maybe you solved problem!

But... this photo than confusing me much!

[robopatt]

HoHoHo
And a bottle of rum!!
Thanks
Porkluvr
This were the major mistake!Now all we need is some fine tuning and optimization.

Ivconic the strangest thing is that in original relic hawk this diode is orientated just the way you show.In Maxs schematic its shown Porkluvrs way but in Fred PCB according Maxs scheme this diode is mistaken and it lays like in your scheme.
So strange but now its work!I told you about those resistors.But how I couldnt spot this diode.No meter now.
Sens is almost none but now its the coil time for shore.

)))))))

5,9kHz The sound is not bad but a little bit week and spitting.Large 8 ohm speaker used.
Disc is also working.

[porkluvr]

)))))))

5,9kHz The sound is not bad but a little bit week and spitting.Large 8 ohm speaker used.

I thought that RH was supposed to have 5000 output. If so, then 5900 is not some small deviation - you should perhaps add some tank capacitance or else the discriminate circuit might not be "aligned" properly. Just a hunch.

What is your C value? Either your C is low or else your coil L is low. Either way, adding C should help. (Uh, er, um theoretically that is.)
Is 5000 the correct frequency??

[robopatt]

5kHz is the right value.Now i have 5,9kHz.But this is first test coil.
But to make it clear you sugest to add capacitator via TX right?

[Unregistered]

No!
MAKE PROPER COIL!
DONT WASTE TIME WITH BAD COIL!
DONT CONFUSE YOURSELF MORE!