New Doepfer Envelopes A-141-4, A-140-2, A-142-2

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Shledge
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Post by Shledge » Thu Aug 08, 2019 3:33 am

I got a response from Dieter on how to make it less picky with gates - it seems it needs a gate with a fairly sharp rising/falling edges at the moment, meaning some modules can't trigger it properly or at all:

"Hello,

the A-140-2 is based on the CEM3310 ADSR circuit. The 3310 requires both a gate and an internal trigger signal. The trigger signal is derived from the gate signal by means of a capacitor (C3 and C7). The recommended value in the data sheet is 3nF. In the A-140-2 we already increased the value a bit to 4n7. But if the rising edge of the gate signal is too flabby the trigger is not generated as expected. Maybe increasing the values of C3 and C7 may help (e.g. adding a second 4n7 or 10n capacitor in parallel). But as a rule gate signals should have fast rising and falling edges.
The A-143-2 uses a different circuitry. That's why it may work also with slower edges of the gate signal.

Hope this helps and feel free to publish the information if it solves the problem"

I'm going to try it this weekend, seems like a straightforward mod. If it works I'll let everyone know. 8-)

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airfrankenstein
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Re:

Post by airfrankenstein » Sun Jan 19, 2020 1:40 pm

Monotremata wrote:
Sun Jul 08, 2018 4:05 am
The A-140-2 looks rad! Its kinda like two of the Blue Lantern ADSR I have in the same size package. All its missing is a linear/exponential switch, and the looping mode. The Blue Lantern has a "Time" CV too, and a manual knob for "Time", but theres no manual or even one page PDF for it anywhere that tells you what anything on the module actually does.

BL ADSR is also cool for ratcheting in gated mode.

BenB
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Re: New Doepfer Envelopes A-141-4, A-140-2, A-142-2

Post by BenB » Mon May 18, 2020 1:28 pm

One for owners of the A-140-2...

How much of a problem have you had getting it to trigger from different sources?

I'm v interested but am being put off by reports that it's a bit picky about gates etc

Any experience would be much appreciated

I'd be triggering from RCD, SCM, Varigate 4+, QMI2

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tobb
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Re: New Doepfer Envelopes A-141-4, A-140-2, A-142-2

Post by tobb » Mon May 18, 2020 6:55 pm

Dieter in space!
Dieter doepfer.jpg
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windchill
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Re: New Doepfer Envelopes A-141-4, A-140-2, A-142-2

Post by windchill » Fri May 22, 2020 8:54 am

BenB wrote:
Mon May 18, 2020 1:28 pm
One for owners of the A-140-2...

How much of a problem have you had getting it to trigger from different sources?

I'm v interested but am being put off by reports that it's a bit picky about gates etc
I'm also interested to hear comments on this.

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Shledge
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Re: New Doepfer Envelopes A-141-4, A-140-2, A-142-2

Post by Shledge » Fri May 22, 2020 9:11 pm

I made a post above on how to rectify it. Did the mod and it works fine for me now.
viewtopic.php?p=3102038#p3102038

BenB
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Re: New Doepfer Envelopes A-141-4, A-140-2, A-142-2

Post by BenB » Sat May 23, 2020 2:34 am

Thanks for replying, unfortunately I have none of the relevant skills, knowledge or tools to do mods!

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Re: New Doepfer Envelopes A-141-4, A-140-2, A-142-2

Post by BenB » Fri May 29, 2020 5:01 am

Anyone else have experience?
BenB wrote:
Mon May 18, 2020 1:28 pm
One for owners of the A-140-2...

How much of a problem have you had getting it to trigger from different sources?

I'm v interested but am being put off by reports that it's a bit picky about gates etc

Any experience would be much appreciated

I'd be triggering from RCD, SCM, Varigate 4+, QMI2

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