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 Forum index » DIY Hardware and Software » fonik's place
PCBs for Thomas Henry's X-4046 VCO
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fonik



Joined: Jun 07, 2006
Posts: 3759
Location: Germany
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PostPosted: Tue Jul 26, 2011 7:21 am    Post subject: Reply with quote  Mark this post and the followings unread

so there must be something wrong (no news, ain't it?). the good news is, that the circuit and the board is proven to be correct, so there will be an error that you can easily correct. you just have to find it Very Happy

i would triple check all wiring 1st.

then "greenline" the schematic, thus measuring and checking all connections and values, and marking them with a green pen on a printout of the schematic.
(any other color would do, i made good experiences with green, though).

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cheers,
matthias
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tokyomatik



Joined: Jan 20, 2011
Posts: 123
Location: berlin
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PostPosted: Tue Jul 26, 2011 8:02 am    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
so there must be something wrong (no news, ain't it?). the good news is, that the circuit and the board is proven to be correct, so there will be an error that you can easily correct. you just have to find it Very Happy

i would triple check all wiring 1st.

then "greenline" the schematic, thus measuring and checking all connections and values, and marking them with a green pen on a printout of the schematic.
(any other color would do, i made good experiences with green, though).

hey thanx for the goods news
i think you must be a really funny guy
is a luck that you don't live in berlin
probably i was coming to you everyday in your pl Laughing ace to stress you because something is not working....
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tokyomatik



Joined: Jan 20, 2011
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Location: berlin
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PostPosted: Tue Jul 26, 2011 12:22 pm    Post subject:   Reply with quote  Mark this post and the followings unread

ehm
while i was checking with the multimeter the coarse pot
pin 1 and pin2 by mistake i touched the two terminals and i saw some smoke coming from the area of the tl074 on the vco core
Crying or Very sad
so now i don't know if i burned the tl074, or the electrolithic or one of the resistors at the bottom of the ic or the 220r close to the -v....something happened around there......
somebody can lend me a gun that i wanna kill myself?
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fonik



Joined: Jun 07, 2006
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Location: Germany
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PostPosted: Tue Jul 26, 2011 9:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

tokyomatik wrote:
ehm
while i was checking with the multimeter the coarse pot
pin 1 and pin2 by mistake i touched the two terminals and i saw some smoke coming from the area of the tl074 on the vco core
Crying or Very sad
so now i don't know if i burned the tl074, or the electrolithic or one of the resistors at the bottom of the ic or the 220r close to the -v....something happened around there......
somebody can lend me a gun that i wanna kill myself?

oops.
what i would do:
1st - triple check wiring and "greenline" as mentioned above; without power connected to the board, of course.
2nd - replace the TL074

BTW resistors can take quite a little bit of power. if you burned one, you should see it by the chenged color of the resistor (turned brown).

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cheers,
matthias
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Blue Hell
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Joined: Apr 03, 2004
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PostPosted: Wed Jul 27, 2011 9:46 am    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
BTW resistors can take quite a little bit of power. if you burned one, you should see it by the chenged color of the resistor (turned brown).


Unless all the magic smoke escaped through a tiny little hole on the underside - I've seen that on low valued resistors (like 10 Ohm or lower) - pretty hard to spot that with the eyes only.

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fonik



Joined: Jun 07, 2006
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Location: Germany
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PostPosted: Wed Jul 27, 2011 1:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

Blue Hell wrote:
fonik wrote:
BTW resistors can take quite a little bit of power. if you burned one, you should see it by the chenged color of the resistor (turned brown).


Unless all the magic smoke escaped through a tiny little hole on the underside - I've seen that on low valued resistors (like 10 Ohm or lower) - pretty hard to spot that with the eyes only.

thank's for the hint, jan. fortunately i did not fry too many resistors yet Laughing

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Sonic



Joined: Dec 02, 2010
Posts: 84
Location: Toronto

PostPosted: Sat Sep 10, 2011 1:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Fonik

Do you still have spares? I would love 2 sets if you have them.

Richard
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fonik



Joined: Jun 07, 2006
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PostPosted: Sat Sep 10, 2011 1:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

i will have to check the open orders vs. what i have left here on monday. i think i have still enough core PCBs, but i am not sure about the waveshapers... hold on.
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Sonic



Joined: Dec 02, 2010
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PostPosted: Sat Sep 10, 2011 1:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Okay. Thanks mate. Fingers crossed. Smile
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fonik



Joined: Jun 07, 2006
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PostPosted: Mon Sep 12, 2011 12:25 am    Post subject: Reply with quote  Mark this post and the followings unread

all good, sonic. check PM soon.
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oozitron



Joined: Apr 02, 2007
Posts: 35
Location: USA

PostPosted: Fri Oct 21, 2011 7:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Finally getting a chance to build this and I'm hesitating on cap C11

In my notes I have written "MYLAR" next to it, and I've backtracked thru the various threads but can't find out where I got this from.

Does C11 have to be Mylar? Or will a good quality Polyester Film work?

(If anyone has a specific Mouser part they've used that would be ideal)

I want it to really sound good, since I've sold one of my Blacet VCOs to fund a batch of these!

THANKS!
Drew
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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Oct 21, 2011 9:37 am    Post subject: Reply with quote  Mark this post and the followings unread

C11 is just for the AC coupling of the FM input, so not critical at all IMHO. it is not part of the audio path anyways.
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a.b.o.z.



Joined: Feb 07, 2007
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PostPosted: Mon Oct 31, 2011 4:18 am    Post subject: Reply with quote  Mark this post and the followings unread

matthias, are there any boards left?
I would like to have one set if possible.

cheers

Ivan
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fonik



Joined: Jun 07, 2006
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PostPosted: Mon Oct 31, 2011 6:31 am    Post subject: Reply with quote  Mark this post and the followings unread

i have some core PCBs left. i re-ordered a few waveshaper PCBs to have complete sets again. they should arrive early november... i will let you all know here in this thread.
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inlifeindeath



Joined: Apr 02, 2010
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Location: Albuquerque, NM

PostPosted: Wed Nov 09, 2011 8:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wooo hooo! Just got mine put together and it works great first shot! Used the scope to calibrate it, easy enough. Sounds great and is a blast to play with. The hard sync is indeed awesome, thanks all who were involved!
Video as soon as I can find the camera charger.

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fonik



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PostPosted: Thu Nov 10, 2011 12:49 am    Post subject: Reply with quote  Mark this post and the followings unread

inlifeindeath wrote:
Wooo hooo! Just got mine put together and it works great first shot! Used the scope to calibrate it, easy enough. Sounds great and is a blast to play with. The hard sync is indeed awesome, thanks all who were involved!

Very Happy

Quote:
Video as soon as I can find the camera charger.

he is doing a video, he is doing a video... banana

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fonik



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PostPosted: Thu Nov 10, 2011 12:50 am    Post subject: Reply with quote  Mark this post and the followings unread

BTW the waveshapers are in, so i now have a few complete sets again...
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a.b.o.z.



Joined: Feb 07, 2007
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PostPosted: Thu Nov 10, 2011 1:40 am    Post subject: Reply with quote  Mark this post and the followings unread

ok, loged in finaly.

I would like one set please.

Cheers

Ivan
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SubG (deactivated)



Joined: Oct 09, 2009
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PostPosted: Sat Nov 12, 2011 4:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

have a question regarding the outputs:

ramp out = 'skew' output

pulse out = output affected by PW and PWM

is this right?

thanks
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fonik



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PostPosted: Sat Nov 12, 2011 4:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

SubG wrote:
have a question regarding the outputs:

ramp out = 'skew' output

pulse out = output affected by PW and PWM

is this right?

thanks

yes.

J6 is the "rampoid" out, which is influenced by the "skew" control pot (R53). i think this is what you mean?
my explanation: "ramp" is another word for "saw", and the "rampoid" is a mixture of "triangle" and "saw".

J10 is the pulse out, affected by PW and PWB

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SubG (deactivated)



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PostPosted: Sun Nov 13, 2011 2:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks!
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reve



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PostPosted: Mon Nov 14, 2011 6:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

So after a lot of dilly-dallying, I finally got around to building my boards and shapers (polyphony will finally be mine!). I'm still waiting for pots, so in the meantime I figured I'd start drilling panels.

Thing is, I want to have the option of using the shapers with external VCOs as well. I figured I'd just run the triangle out from the core to a normalized jack and then run it back to the shaper? Is there anything with... wire length or shielding anything that I need to worry about or would that be cool?

Seems like a stupid question, but... I'd rather ask it before drilling panels just to be sure. Smile

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fonik



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PostPosted: Tue Nov 15, 2011 12:35 am    Post subject: Reply with quote  Mark this post and the followings unread

reve wrote:
Thing is, I want to have the option of using the shapers with external VCOs as well. I figured I'd just run the triangle out from the core to a normalized jack and then run it back to the shaper? Is there anything with... wire length or shielding anything that I need to worry about or would that be cool?

since you use this normalized jack as an input, there is nothing more to think about. you wanted to use the triangle ouput on the J_WS header on the core board for this, i believe.

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The Bad Producer



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PostPosted: Tue Nov 15, 2011 5:19 am    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
BTW the waveshapers are in, so i now have a few complete sets again...


Hi Matthias, have you got two sets perchance? Seems I missed this!

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fonik



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PostPosted: Tue Nov 15, 2011 5:49 am    Post subject: Reply with quote  Mark this post and the followings unread

yes.
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