I have built the Diatonic Converter but am having trouble with the Maj/Min input.
I wired up an SPST toggle switch for Maj/Min, with +15VDC wired
through a 100K resistor for Min mode, unconnected (default) for Maj
mode - that should be right, yes? I'm unable to get it to switch to
different modes between Maj & Min - they are exactly the same when I
switch between them while an 8-note run plays up and down the scale.
This is the case whether I use this normalled switch or feed it a
0-5Vp-p pulse wave LFO (and the voltage is definitely getting through
to the Maj/Min pins on the CD4053B).
Stranger still, there seems to be some sort of active "field" around
the lower 1/2 of the CD4053B there where the Maj/Min mode is supposed
to be controlled (this isn't happening with any of the other chips and
even not on the top 1/2 of the 4053). If I hold my finger close to the
chip at this spot the control voltage output of the circuit gets
unstable and distorts.
Anyone have any idea what might be going on? I was
able to get the board calibrated really well otherwise - works great
and is very stable. Could this chip be fried? I'm doubtful because the
circuit works otherwise, but I'm not sure what purpose this chip
serves in the circuit other than effecting the mode. I'm guessing if
it's working otherwise it's probably not as simple as the chip being
bad. I'm driving this Diatonic Converter from a Ray Wilson MFOS Quantizer and the quantizer circuit is working perfectly and
is also very well calibrated.
Any help very much appreciated.
_________________________________________________________________
Windows Live� SkyDrive: Get 25 GB of free online storage.
http://windowslive.com/online/skydrive?ocid=TXT_TAGLM_WL_skydrive_032009
[Non-text portions of this message have been removed]
I wired up an SPST toggle switch for Maj/Min, with +15VDC wired
through a 100K resistor for Min mode, unconnected (default) for Maj
mode - that should be right, yes? I'm unable to get it to switch to
different modes between Maj & Min - they are exactly the same when I
switch between them while an 8-note run plays up and down the scale.
This is the case whether I use this normalled switch or feed it a
0-5Vp-p pulse wave LFO (and the voltage is definitely getting through
to the Maj/Min pins on the CD4053B).
Stranger still, there seems to be some sort of active "field" around
the lower 1/2 of the CD4053B there where the Maj/Min mode is supposed
to be controlled (this isn't happening with any of the other chips and
even not on the top 1/2 of the 4053). If I hold my finger close to the
chip at this spot the control voltage output of the circuit gets
unstable and distorts.
Anyone have any idea what might be going on? I was
able to get the board calibrated really well otherwise - works great
and is very stable. Could this chip be fried? I'm doubtful because the
circuit works otherwise, but I'm not sure what purpose this chip
serves in the circuit other than effecting the mode. I'm guessing if
it's working otherwise it's probably not as simple as the chip being
bad. I'm driving this Diatonic Converter from a Ray Wilson MFOS Quantizer and the quantizer circuit is working perfectly and
is also very well calibrated.
Any help very much appreciated.
_________________________________________________________________
Windows Live� SkyDrive: Get 25 GB of free online storage.
http://windowslive.com/online/skydrive?ocid=TXT_TAGLM_WL_skydrive_032009
[Non-text portions of this message have been removed]