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On Tue, Sep 22, 2015 at 12:57 PM, Janne Gson Berg tapirkillen@... 1 < Doepfer_a100@yahoogroups.com > wrote:
Input voltage should be 11, not 22. +/- 11V should be transformed to +/- 5V.
/Janne
To: Doepfer_a100@yahoogroups.com
From: Doepfer_a100@yahoogroups.com
Date: Tue, 22 Sep 2015 12:19:03 +0200
Subject: Re: 1 A127 and the BOM
Thanks for that Nicholas! Most helpful!
Ernst
On Tue, Sep 22, 2015 at 11:45 AM, Nicholas Keller maq163x2@... 1 < Doepfer_a100@yahoogroups.com > wrote:
http://www.raltron.com/cust/tools/voltage_divider.asp
Insert the input voltage of 22, value of R1 (numbers only, 1K = 1000), and desired output voltage of 5 (to match range of other Doepfer LFOs) or 10....and press compute.
On Tuesday, September 22, 2015, achtung_999 heinrich.himmelwasser@... 1 < Doepfer_a100@yahoogroups.com > wrote:
Found this from a discussion in 2009:
" The LFO outputs are available at pin 7 (triangle) and pin 8 (rectangle) ofthe TL084. 1k protection resistors should be used to connect these pins to
the additional sockets. And a simple voltage divider made of two resistors
is recommended for the rectangle output because pin 8 outputs about +/-11V
(i.e. ~ 22V overall voltage level).
Best wishes
Dieter Doepfer"
Is this also valid for the version 2And about the mentioned voltage divider: what values do you advise for these
all the best,
Ernst
On Mon, Sep 21, 2015 at 2:09 PM, achtung_999 < heinrich.himmelwasser@... > wrote:
btw. I have a version 2
On Mon, Sep 21, 2015 at 2:09 PM, achtung_999 < heinrich.himmelwasser@... > wrote:
Oh that would be excellent! Thanks!
Ernst
On Mon, Sep 21, 2015 at 10:59 AM, yahoo@... 1 < Doepfer_a100@yahoogroups.com > wrote:
Of course the signals of the LFOs are available on the pc boards. But we would have to increase the width of the front panel to add> Tomorrow I am picking up a used A127 from someone that sells it for a nice price.
> I am of course looking at the BOM module also..
> One HUGE question remains though:
> why are the LFO outputs left off the BOM module
> Seems like a pretty strange omission to me...
>
>
> Ernst
the LFO outputs. If you want to built your own breakout module I can tell you the corresponding solder points on the A-127 pcb.
Best wishes
Dieter Doepfer
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