RELIC HAWK

[ivconic]

Ohhh....SORRY!
Those should not be +5 and -5 at all. You have proper voltages already. Don't worry!
Like many times in the past, i am using only available symbols in ExpressPCB. There are only standard +5,+9 and +12 as well as -5,-9 and -12 symbols for power paths.
That's why i used +5 and -5 and later forgot to delete "5".
Dont bug your self trying to achieve those voltages, you will not.
For a moment focus only to TX stage.
Proper choice of transistor there is critical.
I planned BC327 (2x) and BC337 for TX stage. But even those must be pretty simillar in hFe.
Change transistors there until you get oscillations.
Also look here for previous Max's post about coil&tx stage issues.
Max found out that oscillator will not run if coil exceed some resistive values. This is mostly due fact that we still dont know which one is main transistor in TX.
I never payed attention on that cose i do have original RH coil...

[robopatt]

OK.
This solved one of my troubles.
I used this too 2xbc327 and 1xbc337.
I will try bc 547 and 2x bc 557.Or bc547;bc557+bc327
Is it problem that I used 1N4007?I couldnt find 5400.

[ivconic]

No it is not a problem. 4007 will do just fine.

[robopatt]

So,
will tweek around tx and will inform you.
I will try to buy some good ML coil this days.But 19 not 37.
So you say that abcence of negative voltage is because the oscilator dont work?
-2,5v is there so you might be right.
The spykes are there no metter that no coil attached.

[Unregistered]

In TGSL bc 327 in osc.stage dont work,but 2n2907 work fine.Maybe same problem.

[robopatt]

Hahaha
I have try what I can.Same result.
Then decided to try posted in last schematic audio.
Gues what?The speaker fired itself!Wow.
So now I will restore like it was and will search again

[ivconic]

Hahaha
I have try what I can.Same result.
Then decided to try posted in last schematic audio.
Gues what?The speaker fired itself!Wow.
So now I will restore like it was and will search again

?Eh!?
Note in last schematic that i changed pullup resistor from 22K to 4K7? Did you saw that? Also speaker is not 8 ohms any more but 16ohms....you saw that?

[robopatt]

Have changed all like you say!
Only speaker was not changed to 16 ohm.But do you think this is the real problem?
Beside of this I have noticed some change like some strange sound apered but oscillator was not working and there were still no V- .
So I decided to restore like it was.And work on oscillator.
Any new ideas?
Because its ready now.I have try bc547,557,....
If you think that speaker is the probleme I will repeat the procedure but this time will use 16 ohm.

[ivconic]

No, dont bug yourself.
Just leave it like it is right now. Try to make oscillator to work.
Try to make some other coil...
Read Max's post in previous pages. As i remember, Max also has simillar problems from a start, but later he solved it and made his device to work very good.
It is all about coil and transistors there...
You have good voltages there, dont bug yourself with those anymore..
Switch those 2 resistors in TX.
Use BC557 and BC547 and for the main transistor...i am not sure...you must experiment.

[robopatt]

A friend came for a coffee.
And I had a short chance to test with musketeer coil.And same story.
But have noticed that if I touch U4/with my handmade coil and BC327;BC547;BC557/ I get some strange sound like its alive but in same time still oscillator dont work and my frequencymeter burned.
So I will have to buy new one first.

[Fred]

A friend came for a coffee.
And I had a short chance to test with musketeer coil.And same story.
But have noticed that if I touch U4/with my handmade coil and BC327;BC547;BC557/ I get some strange sound like its alive but in same time still oscillator dont work and my frequencymeter burned.
So I will have to buy new one first.

I think the oscillator will not work if you have the frequency meter directly connected to it.
You should try inductive coupling or after amp stage.

[Max]

In TGSL bc 327 in osc.stage dont work,but 2n2907 work fine.Maybe same problem.

? are you sure you wired it with right pinout ?

bc327 when leads down and flat facing you has collector on the left...
it's easy to mess up with orientation there.

Also... required hfe you have to match cause 327 is sometimess... kinda of lazy thing.

Kind regards,
Max

[Max]

?Eh!?
Note in last schematic that i changed pullup resistor from 22K to 4K7? Did you saw that? Also speaker is not 8 ohms any more but 16ohms....you saw that?

Yes... 16ohm speaker always better in that dang things... (MDs I mean).

And if Apple made... well... even better!

But what's new about that RH new version ? It is working or not ? I still don't understand if there's something missing or not...

Maybe I have to READ all that posts of above but I will be thankful of direct explainations of troubles with it.

Kind regards,
Max

[Max]

A friend came for a coffee.
And I had a short chance to test with musketeer coil.And same story.
But have noticed that if I touch U4/with my handmade coil and BC327;BC547;BC557/ I get some strange sound like its alive but in same time still oscillator dont work and my frequencymeter burned.
So I will have to buy new one first.

Hi,
Ivconic is really right (as always) : you have to play with coils and transistor at osc stage, otherwise device will never work.

Don't trust sound at that level, just check the sinus voltage... use a frequency meter and the like to get exactly 5KHz.

Just AFTER you get perfect 5KHz sinus you'll start to think at other troubles (if any).

Now... cause you have right voltages there the problem must be at oscillatior section... REMEMBER it's really critical piece of circuit and you'll get much troubles before make it work right way... it's about small tolerances in e.g. resistance of coil and gain of transistors.

Kind regards,
Max

[Max]

I think the oscillator will not work if you have the frequency meter directly connected to it.
You should try inductive coupling or after amp stage.

Hi Fred,
uhm... maybe right in his case... I don't know. All depends on impedance at freq meter input... if really (several Mohms) high he'll read frequency with no pain to the osc... cause of really small load on it.

Also... the RH oscillator is made to generate a (bang) resonance freq of 5KHz at coil/cap resonator... that's hi voltage of several tens volts in the ideal case that means it's more and more powerful than simple e.g. colpitts (like in TGS and other Tesoro's) so... even bad freq meters with lower input impedance will get a reading there... (or get burnt in a few seconds! ).

Sure, your advice is in the right direction anyway: I suggest him (next step) to check frequency in another part of circuit after digital gates (e.g. at frequency div).

Kind regards,
Max