EHX - Attack Decay 5300  [schematic]

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Professor SourTone
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Post by Professor SourTone »

I bought this not working. It passes signal and the blend works, but no effect. I contacted Howard Davis and he says whatever it is he can fix it.

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Post by nelson »

I have been wanting to design a workalike of this for ages with an MN3207 and an LM31700. I had a couple of schematics too, seem to have lost them.

Anyone have copies?
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EHXAttackDecay.pdf
EH Attack Decay schematic
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Post by analogguru »

Thanks for the guts !
I bought this not working. It passes signal and the blend works, but no effect. I contacted Howard Davis and he says whatever it is he can fix it.
It is really not so complicated to fix it, no special or unobtainable components inside. The only problem will be the shipping and the cost therefore, I think.

I would start looking if the 4047 is delivering a clock to the MN3007. C-mos (like 4013) driving a BBD often fail. Then control the MN3007 itself.

You can do this by bypassing the 3080.

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Post by Professor SourTone »

I'm not technically up to doing that, but perhaps if I replaced one or all of those chips (being mindful of static etc) something good might happen?

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Post by theehman »

I've fixed a couple of those but I don't remember exactly what was wrong with them. On any BBD-based device I always check voltages first and then the input/output of the BBD.
What you should do is get it fixed then sell it and buy the Pigtronix Attack Sustain, also designed by Howard Davis. It does everything the Attack Decay does and does it polyphonically and better.
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Post by analogguru »

Professor SourTone wrote:I'm not technically up to doing that, but perhaps if I replaced one or all of those chips (being mindful of static etc) something good might happen?
yes.....

I would start with the 4047, then 4013 and 4066 after that the MN3007 then the two 3080... all are socketed.

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Post by Professor SourTone »

Where would be my best source for those chips? I'm in London, but I guess they'd cost nothing to send from anywhere.

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Post by analogguru »

Professor SourTone wrote:Where would be my best source for those chips? I'm in London, but I guess they'd cost nothing to send from anywhere.
Hmmm...... when I remember..... back in 1979 number one adress would be the complete Edgeware-road and number two the Tottenham-court-road....

One electronic shop beside the other..... you could get everything there... I don´t know how it is today....

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Post by Professor SourTone »

ah, so easy chips to find then!

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Post by Professor SourTone »

Right, I've found this site, which appears to have all of them. Edgware Road and TC Road have changed since the 70's!

http://www.vintageplanet.nl/content.html#but-order

There appear to be several choices of each. Are they interchangeable or should I avoid any of them? Thanks - PT

4047, 4013, 4066, MN3007, 3080... in groups, in order...

HCF4047BE Monostable/Astable Multivibrator . . . . . . . . . . 1.05 1.25

MC14013B Dual D-Type Flip-Flop - DIP14 . . . . . . . . . . . . 1.55 1.85
4013 CD4013BE - Dual D-Type Flip-Flop . . . . . . . NOS 1.00 1.19
KG- 4013 - Dual D-Type Flip-Flop . . . . . . . . . NOS 1.00 1.19

MC14066B Quad Bilateral Switch . . . . . . . . . . . . . . . . 1.05 1.25
MC14066BCL Quad Bilateral Switch - CerDIP . . . . . . . . . . . 0.84 1.00
MC14066BCP Quad Bilateral Switch . . . . . . . . . . . . . . . . 0.67 0.80
TC4066BP Quad Bilateral Switch - DIP14 . . . . . . . . . . . . 0.92 1.10
TC4066BP Quad Bilateral Switch . . . . . . . . . . . . NOS 0.92 1.09
AK-EI-310036 TC4066BP Quad Bilateral Switch . . . . . . . . NOS 0.92 1.10
CD4066BE Quad Bilateral Switch . . . . . . . . . . . . NOS 0.67 0.80

TDA2107 (MN3007) 1024-Stage Low-Noise BBD - DIP8 . . . . (1) 10.00 11.90
RL- MN3007 - 1024-Stage Low Noise BBD . . . . . . NOS 10.00 11.90
MN3007 1024-Stage Low Noise BBD . . . . . . . . . . . NOS 10.00 11.90

CA3080 Single OTA . . . . . . . . . . . . . . . . . . NOS 1.26 1.50
CA3080E Single OTA . . . . . . . . . . . . . . . . . . NOS 1.26 1.50

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Post by analogguru »

All of them can be used. For the CA3080 i would choose the CA3080E even when I don´t believe that they will stock the metal-can version (E is the plastic DIP-version).

Funny that they list the TDA2107. That is a (for Philips) restamped version of the MN3007 which never really appeared on the market. I doubt that they have some in stock, instead they will send the MN3007.

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Post by Professor SourTone »

Thanks very much for your help. I've ordered a few extra of each, just in case!

2x HCF4047BE Monostable/Astable Multivibrator . . . . . . . . . . 1.05 1.25

1x MC14013B Dual D-Type Flip-Flop - DIP14 . . . . . . . . . . . . 1.55 1.85
1x 4013 CD4013BE - Dual D-Type Flip-Flop . . . . . . . NOS 1.00 1.19


2x CD4066BE Quad Bilateral Switch . . . . . . . . . . . . NOS 0.67 0.80


2x MN3007 1024-Stage Low Noise BBD . . . . . . . . . . . NOS 10.00 11.90

4x CA3080E Single OTA . . . . . . . . . . . . . . . . . . NOS 1.26 1.50

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Post by analogguru »

If you don´t need the spare components you can start to build your first clone.....an EH Attack Decay.... :roll: :lol:

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Post by Rodgre »

Interesting....though I have a schematic for it somewhere, I guess I never noticed that there was a BBD in the circuit.

This has been on my short list of pedals I need to own before I die. I was really psyched that the Pigtronix pedal was released, but unfortunately I can't spare a nickel on a new pedal at the moment.

Can someone explain how this pedal works, and what role the BBD plays in it's function? I've played one only once, and I felt it was very different from the Slow Gear, and much more interesting to me.

Thanks
Roger

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Post by Professor SourTone »

Well unfortunately changing all the chips (twice) yielded no result. Its possible whoever had it before got the orientation of the chips wrong (I copied it exactly), or else its something else. I think I'll send it to Howard, after all he designed the thing! Thanks for the help, though.

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Post by paperhouse »

Rodgre wrote:Interesting....though I have a schematic for it somewhere, I guess I never noticed that there was a BBD in the circuit.

This has been on my short list of pedals I need to own before I die. I was really psyched that the Pigtronix pedal was released, but unfortunately I can't spare a nickel on a new pedal at the moment.

Can someone explain how this pedal works, and what role the BBD plays in it's function? I've played one only once, and I felt it was very different from the Slow Gear, and much more interesting to me.

Thanks
Roger
yeah, i thought this was a simple swell a'la the boss slow gear. i'm curious about the BBD too.

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Post by analogguru »

....i'm curious about the BBD too.
Maxbe the description below can help a little bit.

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Post by Kaos »

sorry guys for beeing a little ot
but why do i not have the permission to see the attachments?
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Post by modman »

I'm sorry about this - should be fixed now.
Is this the first attachment in this section then? :scratch:

thanks for reporting this
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Post by Kaos »

yes :)
now i can see the files
thx modman

@topic
is it possible to draw up a scheme?
because i am very curious how this thing works
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