EH Echoflanger  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...

Re: EH Echoflanger

Postby Fender3D » 22 Jan 2015, 10:54

I opened this thread http://www.freestompboxes.org/viewtopic.php?f=28&t=22623 in order to collect info on BBDs' clocks...
No replies so far, I wish you a better luck than I had, Scruffie :hug:
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Re: EH Echoflanger

Postby Scruffie » 22 Jan 2015, 11:20

I got in contact with our old friend graemey who's going to take some measurements of his echoflanger unit, i'll post them up in that thread once i've got 'em :thumbsup

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Re: EH Echoflanger

Postby Scruffie » 22 Jan 2015, 14:11

Posted them in your BBD clock thread and i'll post them here for posterity too.

EHX Echoflanger Frequencies courtesy of Graemey's Stompbox Secrets, taken at Pin1 of the 4013.

Tune - CW
Width - CCW
Rate - CCW
Feedback - CCW
Filter Matrix 341kHz
Double Track 110.9khZ

Tune - CCW
Width - CCW
Rate - CCW
Feedback - CCW
Filter Matix 54.5kHz
Double Track 17.71kHz

Tune - CW
Width - CW
Rate - CCW
Feedback - CCW
Flange 439-50kHz
Chorus 114-82kHz

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Re: EH Echoflanger

Postby Scruffie » 06 Aug 2015, 02:12

Minor update!

The 3007 Echoflanger i'm doing with Lectric FX is still in progress, a rather large break was taken after the first go due to both parties having other shit to do.

Anyway, back on it and here's what's what.

The circuit works great but, charge pump on board or not (fixed 18V supply tried stand alone didn't change much) and layout fixes, among other minor issues there was still some heterodyning on board from the dual clock/buffer set up.
While using 2 x 4049 was in current limits of the charge pump (the max clock reading is only about 550kHz) the excess drain made issues worse so a single chip will now be used like the original, experimenting if it should be split between the 2 chips or just buffer the what i'll call 'high chip' is in progress, on the protos. It worked fine with it only buffering (in the popular 1 in to 2 set up) the high clock chip, but to test that adds no ill effects to the second chip we're doing further testing.

We added some extra filtering too, nothing massive, some simple 15kHz-ish filters at the input of each BBD as is fairly standard practice (and the original lacked) which seems to have taken care of most of the issues and cut noise down considerably without affecting tone.

Speaking of noise, to the person who mentioned MN3001s as a suitable substitute to the original SAD's as "they were dual 512 stage chips" on a whim I did try them after some hacking and as I suspected, the added gain needed to recover the massive losses (remembering that SAD's actually add gain) made an already high noise circuit unbearable... there's a fairly good reason they were lost to obscurity (even the MN3004 can be a bit of a noisy chip!).

Some added minor filtering updates other than that, mainly in the LFO/VCO (a bit of filtering in the feedback loop in the gain stage pre/including the VCO considering where you want to say it starts reduced some annoying thump at high depths and on the LFO its self) and it should be a go this year.

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Re: EH Echoflanger

Postby Scruffie » 06 Aug 2015, 15:01

Oh and I collected some readings from another 2 units after helping people debug them and set the clock to the factory setting.

1st Unit.

Settings
Tune - CW
Width - CCW
Rate - CCW
Feedback - CCW

Filter Matrix - 250kHz
Double Track - 66kHZ

Settings
Tune - CCW
Width - CCW
Rate - CCW
Feedback - CCW

Filter Matrix - 36kHz
Double Track - 10kHz

Settings
Tune - CW
Width - CW
Rate - CCW
Feedback - CCW

Flanger 35 - 330kHz
Chorus 14 - 20khZ

Second Unit

Settings
Tune - CW
Width - CCW
Rate - CCW
Feedback - CCW

Filter Matrix - 261kHz
Double Track - 81kHZ

Settings
Tune - CCW
Width - CCW
Rate - CCW
Feedback - CCW

Filter Matrix - 43kHz
Double Track - 14kHz

Settings
Tune - CW
Width - CW
Rate - CCW
Feedback - CCW

Flanger 40 - 365kHz
Chorus 20 - 28khZ
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Re: EH Echoflanger

Postby n.d » 07 Aug 2016, 16:18

Bump... or not.
I contacted Stass, he sent me some pictures of his build.
I am now redrawing his layout - a 3007 modified SAD layout.
I expect it´ll take me a week or so to finish it. I will then post it here so you guys can correct it, check for errors, make suggestions, etc.
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Re: EH Echoflanger

Postby n.d » 04 Nov 2016, 22:44

Hello everyone. Here you have a zip containing Stass`schematics, the lo res layout he gave me a few months back, and my unverified - and perhaps unfinished -redraw of said layout.
Please let us know if you find any problems, or make any corrections.
You do not have the required permissions to view the files attached to this post.
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Re: EH Echoflanger

Postby Stasss » 06 Nov 2016, 01:40

Hello!I sorry, for the error in the scheme:

1)--C29 must be disconnected from pin7 NE570 and connected to the output of the filter---pin7 IC9B(LM4558)

2)Output pin3 (7815) (+)C4 is disconnected from R1-R2-and is connected to +15V
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Re: EH Echoflanger

Postby n.d » 09 Nov 2016, 05:23

I will FIX the layout as soon as I can.
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Re: EH Echoflanger

Postby Steab » 13 Oct 2017, 10:23

Hi guys!

The dream of many kid seems to come real on this thread..
Any uptade about the mistake founded on the zip pack?
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Re: EH Echoflanger

Postby Steab » 10 Nov 2017, 08:10

I've found all I need to build it!
Check lectric-fx website and dandy chorus!
:thumbsup
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