Doepfer

Let me try it out first. It is very simple. It will be based on a variation of this circuit fragment - https://www.dropbox.com/s/d4zuu4p62nvwccn/driver.jpg
I may have to add some stuff to extend the pulse a bit, to make it longer than it is. I will see how it works first.
-James



On Feb 6, 2013, at 3:59 AM, charles kerr <thebadproducer@yahoo.co.uk> wrote:

> Hi James,
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> I'd be interested to see your expansion circuit if possible, sounds like a cool addition to the 152! Would it be possible to email it to me or drop it into the file box?
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> Thanks,
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> Charlie
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> --- On Mon, 4/2/13, James Husted <james.husted@mac.com> wrote:
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> From: James Husted <james.husted@mac.com>
> Subject: Re: [Doepfer_a100] Can I mod a A-152 to do this?
> To: Doepfer_a100@yahoogroups.com
> Date: Monday, 4 February, 2013, 18:26
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>      Forgot - no attachments in this forum! basically The thing I attached was a transistor circuit (2N5088) and some resistors and a LED to drive the output jack. It should isolate the processor fine. I will attach it to the expansion header so no mods to the board itself. That is why I asked about what else is on that header. Might as well bring out whatever I can since I will be making a panel for it.
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> -James
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> On Feb 4, 2013, at 10:21 AM, James Husted james.husted@mac.com> wrote:
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>> Thank You Dieter! I  was sure that something like this was available. I will probably make something like this to attach to it:
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>> Nice that it is on an expansion connector too. What else shows up on that expansion connector?
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>> -James
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>> On Feb 4, 2013, at 1:26 AM, yahoo@doepfer.de wrote:
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>>>> -----Ursprungliche Nachricht-----
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>>>> Von: Doepfer_a100@yahoogroups.com
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>>>> [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von James Husted
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>>>> Gesendet: Samstag, 2. Februar 2013 08:41
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>>>> An: Doepfer_a100@yahoogroups.com
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>>>> Betreff: [Doepfer_a100] Can I mod a A-152 to do this?
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>>>> I recently got an A-152 and am using it to select the columns of
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>>>> two of my PGM-4X4 programmers to make sequences that can have
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>>>> programmable patterns to them. What I would like is to mod the
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>>>> A-152 so that I can add an output that produces a trigger
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>>>> whenever the A-152 addresses a new step. This way something like
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>>>> a sine wave into the A-152 would make the PGM-4X4 work like a
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>>>> pendulum and would also produce triggers to fire off envelope
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>>>> generators whenever a new address/column/note happened. Is there
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>>>> some internal circuit logic that can be added to create a trigger
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>>>> out like this?
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>>> This is also available as an internal "hidden" feature since  about 2005.
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>>> The RC4 port pin of the microcontroller (pin 6) outputs a short pulse
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>>> whenever the address changes. The signal is also available at the expansion
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>>> connector on pin 2. Pay attention that the signal is not buffered and not
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>>> protected against short or electrostatic charge (it's the "pure" RC4 port
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>>> signal). The microprocessor will be damaged if a voltage or GND is applied
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>>> to this pin. You have to add a suitable buffer to protect the processor. Do
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>>> not simply connect it to a socket !
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>>> Best wishes
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>>> Dieter Doepfer
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