[Fwd: Re: [sdiy] Boss PC-2, JoMoX XBase-09]

[Colin Fraser]

> -----Original Message-----
> From: owner-synth-diy at node12b53.a2000.nl
> [mailto:owner-synth-diy at node12b53.a2000.nl]On Behalf Of
> Florian Anwander
> Sent: 13 March 2001 08:32
> To: synth-diy at node12b53.a2000.nl
> Subject: [Fwd: Re: [sdiy] Boss PC-2, JoMoX XBase-09]
>
> The XBase 09 uses a plain 909 style Bassdrum. As far as I
> remember the only real
> (but nevertheless minor) difference is the oscillator: The
> 909 uses a triangle
> which is drawn to a sine, the Xbase uses a sine which can be clippped.

The 909 triangle is converted to a sine wave by a resistor and two diodes
(R52, D10 and D11).
If you replace the resistor with a pot and another series resistor, you can
adjust from a sine to almost a squarewave.
Possibly what the Jomox does...

Colin f