Hi da es für Urlaub am Baggersee definitiv zu verpisst ist, wollte ich meinen alten Chorus (Powersound, 80er, 10 Maak, sehr feuchter Klang) mal kurz umbauen, nach dieser Anleitung (Vorsicht, laaanges, englisches Zitat, Urheber anbei, aber vielleicht wertvoll für Alt-Chorus-Recycler):
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The basic difference between a flanger and chorus (other than the
kinds of controls they usually come with) is the delay range they
cover. In most cases, the delay chip they rely on to achieve that
difference in time delay is exactly the same chip, made to perform
differently on the basis of a few external components.
One of the most popular chips used for analog flangers and chorusses
is the MN3207, made by Matsushita/Panasonic (it is a cousin of the
MN3007). The time delay range it covers is determined by its'
associated clock-driver chip, the MN3102 (or MN3101). If you take
your flanger/chorus apart and find these babies inside, you will
likely find a small value capacitor beside the 3101/3102 (somewhere
between 5pf and 100pf, depending on the model/function). Decreasing
the value of this capacitor REDUCES the time delay, while increasing
it LENGTHENS the time delay. You'll likely find something in the
range of 5-20pf for flangers and 20-47pf for chorusses.
By replacing the existing cap with a small value one (e.g.,
6.8-10pf) and installing a 3-position toggle switch to either add in
one of two other capacitors in parallel, or use the replacement
value alone, you can switch between flanger, short chorus, and long
chorus. Not unlike the "range" switches found on some pricier units.
I bought a cheesy chorus for $20 from a pawn shop and modified it in
this manner and it works great. Obviously a two-knob chorus (rate,
depth) does not make a full-fledged flanger, but within those
limitations I've got a very flexible chorus for the price of a toggle
switch and two caps (about $3.00). If you have a 4 or 5-knob
flanger, upping the delay range can create some really interesting
sounds.
You can probably bank on a value of 6.8-10pf getting you standard
flanger sounds, a combined value of 20-25pf (e.g., 10pf + 15pf in
parallel) getting you those sounds that don't sound like the
standard boxy flanger tone, and a combined value of double that
(e.g., 10pf + 39pf in parallel) getting you the standard spacy
chorus sounds. Feel free to fart around from there, although you
probably shouldn't go lower than 5pf or higher than 100pf without a
noticeable deterioration of sound.
A word of caution: this will void your warranty (if you still have
one).
Mark Hammer
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So, jetzt mein Problem:-):
Die Chips sind, wie oben beschrieben, vorhanden, nur hat der MN3102 definitiv keinen Kondesator für die Geschindigkeit - lt. Datenblatt würde der zwischen Pin 5,6,7 mit nem R hängen - nur: da is nix, nada, kein Bauteil. Wie kann also das dumme Teil so überhaupt funzen, und wie krieg ich den dazu, eventuell doch auch zu flangen?
Dank den Experten & Gruß, Ingo
