Korg diode

[Bjorn Julin]

In a orginal Korg current regulator as reverse voltage
protector the leakage at "low currents" the leakage current
offsets the frequency. I find out by inserting and remowing
a diode by a plier (no heated fingers here)and i noticed
that beating slowed down a bit.

But im might be wrong since im not using an exact replica of
the Korg, i use -5 volt as reference and sero volt at OP amp
in put lowest frequency on the CCO.

It might be so since the orginal Trident Lin current regulator
are offseted to work within - range and never go to 0 volt
it might not be noticed there since one calibrates in the
- region and full scale sweeps are also in the - region!

>	>I my suspisousness about using the 1n4148 is werifyed
>	>and i believe that your 1n914 has the same problem!
>	>They both leeaks to much. Affects tuning at low notes!
>
>In which way would that be exactly ?
>I only had problems with 1n4148 diodes when I tried to
>use them for *huge* sweep range VCOs, like a
>several-minutes-LFO to high audio range VCO.

But on the other hand I went out to the garage and looked in my 
semiconductor  converter book and there it says that the 1S1555Tp
are a low leakage diode!!!

So korg did have a reason to use it i suppose!

>No problem in Korg audio range VCOs so far.
>(But I'm aware that the diodes I've used might be
>much better than worst case specs, of course.)
>
>JH.

Other news are that i tried to use the moog osc configuration
,a modifyed one, i used a LF353 at +/-12v and a LM393 at gnd
and +5V driving a 2N2907a and the soft sync was reduced
quite a bit even then i shared the 393 for each oscs comparator!

BJ
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