hobiesound

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #160 on: May 11, 2011, 11:27:53 AM »
well guys the fix seems easy enough doesn't it....  for the low cut AND the low boost to function properly you NEED a dual gang 1x11 switch and a trace cut between a6 and A because that trace permanently bypasses the low cut. And then wire both decks of the switch like on the original schematic. Also you'll need to wire all switches and pots on the filter pcb offboard to facilitate for the bigger low boost/cut switch.

disclaimer: i don't own this pcb so this advice is just coming from me looking at the schematic and comparing it to the original schematic. I do however have a working pcb layout of this filter circuit.

greetings,

Thomas





leadbreath

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #161 on: May 11, 2011, 11:41:17 AM »
thanks hobiesound, i havent had time to check this out but like u im sure its not that difficulta solution...

if u read through one of igor latest updates his market he has put repairing the 69 on the top of his list.
he's a busy man it will take time, i have faith.

mick
f**k marlbro's and weed ill stick to smoking germanium and silicon

Igor

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #162 on: May 29, 2011, 10:31:11 PM »
Hi guys, and sorry it took so much time - currently, I working in Tel Aviv and living in Haifa,
it is about 100 km to each direction back and fourth every day, and absolutely had no time for anything.
Finally, I had some time, and, as first priority thing, putting here the fix.

I tried to source low profile 2x11pos switch, but is is impossible, or I missing something.
The fix is a bit barbarian, but I checked it and it works 100%.
Sorry for bad quality of pictures, I had to build/test both pcb versions of this EQ from scratch in limited time,
as first proto is working at my friend's studio in St. Petersburg (he using it without low cuts and happy).

There were 2 versions of PCB's. One version needs only the low frequency switch fix.

It goes exactly as

well guys the fix seems easy enough doesn't it....  for the low cut AND the low boost to function properly you NEED a dual gang 1x11 switch and a trace cut between a6 and A because that trace permanently bypasses the low cut. And then wire both decks of the switch like on the original schematic. Also you'll need to wire all switches and pots on the filter pcb offboard to facilitate for the bigger low boost/cut switch.

disclaimer: i don't own this pcb so this advice is just coming from me looking at the schematic and comparing it to the original schematic. I do however have a working pcb layout of this filter circuit.

greetings,

Thomas


Many thanx to Thomas for good explanation, and here are the pictures:

- Schematic of how-to wire the switch:

http://i251.photobucket.com/albums/gg291/diy33609/HELIOS_FIX/SWITCH.jpg

- Da FIX:

http://i251.photobucket.com/albums/gg291/diy33609/HELIOS_FIX/1.png

- Semi-hi-res pic showing all this:

http://i251.photobucket.com/albums/gg291/diy33609/HELIOS_FIX/P1060256.jpg

The switch which fits is Grayhill, 71 series, 71BD30-02-1 AJN.
PLEASE CHECK WITH DATASHEET,

www.grayhill.com/catalog/Rotary_71.pdf

because I used Grayhills pulled from old measurement equipment,
and they had no markings.

Fixing:

First, cut the PCB as shown here:





Wire the switch and connect both wipers to A! point.





This is the fix for low cuts issue.

As well, there were some PCB's with LOW BOOST problem.

If you have a problem with LOW BOOST switch (if it starts from +15db), the fix is simple as well.

Check this:

http://i251.photobucket.com/albums/gg291/diy33609/HELIOS_FIX/2.png

Cut 2 traces; for the trace on top layer, if low boost switch is not soldered, it is easy,
OR, if switch is already soldered on PCB, drill the hole 1.5mm like here:



And connect wire as shown:
http://i251.photobucket.com/albums/gg291/diy33609/HELIOS_FIX/2.png

That's all. Here are all pros and cons:

http://s251.photobucket.com/albums/gg291/diy33609/HELIOS_FIX/
« Last Edit: May 29, 2011, 10:52:50 PM by Igor »
http://www.ij-audio.com
(new site hopefully will be up in July)

Igor

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #163 on: May 29, 2011, 11:04:18 PM »
Well, after posting "how-to", let's think about practical side.

If I issued the PCB's with mistake, I should help to fix it without getting into details how it happened
(the collective work and never listen to "good ideas", note to myself)).

This way, I thought out a way of fair compensation....let me know what do you think.

For those who bought the pcb's only, I already have this EQ in 500 series at the stage of drawn PCB and
have to order the proto pcb's and test it. In other words, if you bought PCB's only,
ask for 500 series PCB set for free, just pay shipping ($10).

As well, there were 12-14 kits.

If you bought kits, mail me with transaction ID, I ordering the Grayhill 71BD30-02-1 switches in few days from Digikey,
they show "no stock", but it is matter of month-two; when I receive the switches, just pay shipping ($10) and they will be sent to your address.

MAIL ME with your address etc.

PLEASE NOTE:  Write "HELIOS FIX" in mail subject.
« Last Edit: May 29, 2011, 11:13:42 PM by Igor »
http://www.ij-audio.com
(new site hopefully will be up in July)


ultra-alex

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #165 on: May 30, 2011, 03:31:25 PM »
finally. thanks igor. curious how the low band sounds... ;D
« Last Edit: May 30, 2011, 03:33:13 PM by ultra-alex »

glazunost

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #166 on: May 31, 2011, 06:15:22 AM »
Igor, we love you!!

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #167 on: June 01, 2011, 04:28:22 AM »
Thanks Igor!!

Here the ordering codes for who ordered the pcb only:

Farnell   Ordercode: 1190401

RS stocknummer 2508974858

Soeren_DK

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #168 on: June 28, 2011, 05:44:34 AM »
Hi Igor
I brought the kit from Jim McEvan long time ago. Now I thought about building it but I can see that there is a problem with the lowend switch and you offers to order a new switch. Would it be possible to ship them to me?

Cheers
Soren
Quote from: idylldon
...it works like a champ and is as quiet as a mouse pissing on a cotton ball.

http://www.soundcloud.com/doctorsclub

Soeren_DK

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #169 on: July 07, 2011, 03:56:42 PM »
??? :'( :'(
Hi Igor
I brought the kit from Jim McEvan long time ago. Now I thought about building it but I can see that there is a problem with the lowend switch and you offers to order a new switch. Would it be possible to ship them to me?

Cheers
Soren
Quote from: idylldon
...it works like a champ and is as quiet as a mouse pissing on a cotton ball.

http://www.soundcloud.com/doctorsclub


AW_music

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #170 on: July 18, 2011, 08:03:45 PM »
Hi IGOR,

ANy news about the switches ??
A=A

Igor

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #171 on: July 18, 2011, 08:12:03 PM »
The switches are ordered, on the way here.
http://www.ij-audio.com
(new site hopefully will be up in July)

scottlwilson

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #172 on: August 05, 2011, 11:25:16 AM »
Hello Igor

I would be interested in 2 kits as well.  I love the type 69 but can't afford the Helxxs price.

Thanks!

Scott

AW_music

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #173 on: August 21, 2011, 05:23:52 PM »
Igooooooooooorrrr ......
Are the switches  ARRIVED ???????????

Let us know , PLEASE !
 ??? ;)
A=A

glazunost

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #174 on: August 31, 2011, 09:47:09 AM »
i got me some grayhills and i am now very very close to a working unit. please allow me one question:

i am using the helios style line amp: what does F.B. and FBG stand for? is it something so obvious that i should find out myself?

best, g

volker

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #175 on: August 31, 2011, 10:15:49 AM »
Feedback? Anyway, there is R13 with 1M in series to C5. What you are supposed to do is connect a resistor in parallel to R13, to set the gain of the amp. Smaller resistor = higher gain. Or use a trimmer to dial in exactly unity gain. If you short R13 completely to ground you have maximum gain.

glazunost

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #176 on: August 31, 2011, 11:21:10 AM »
thank you volker. i am learning a hell of a lot with this project

Soeren_DK

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #177 on: September 04, 2011, 05:11:05 PM »
Any news on the switches?

Cheers
Soren
Quote from: idylldon
...it works like a champ and is as quiet as a mouse pissing on a cotton ball.

http://www.soundcloud.com/doctorsclub

Igor

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #178 on: September 06, 2011, 03:36:40 PM »
Yep. Some good news:



Will be shipped to those who bought the kits within a week.

Mind, Helios situation is way better than Hawkboard.
(If I issued this board, and there was a prob, should be the FIX. :) )

More good news:











http://www.ij-audio.com
(new site hopefully will be up in July)

Soeren_DK

Re: 69. Not Helios/Phaeton. Pics/schematics/building support thread.
« Reply #179 on: September 06, 2011, 04:18:48 PM »
Great news...  :) :) :) :)
I'll pm you my address.
As mentioned before I bought the kit from Jim Evan so no need to send the switch to him.  ;)

Cheers
Soren
Quote from: idylldon
...it works like a champ and is as quiet as a mouse pissing on a cotton ball.

http://www.soundcloud.com/doctorsclub


 

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