Speak&Spell LFO
Here are schematics for adding a pitch modulating LFO to your Speak&Spell.
I also added some simple mods that work well with the LFO. One is a “HOLD” effect which grabs the sound that is playing when it is activated and loops it. The other is a “TONE” effect which generates a straight tone.
This is a pretty rough design and I’m sure it could be cleaned up and improved, but it’s simple and it does work pretty well.
mike said:
November 29th, 2007 at 12:19pm #
any sound samples? this looks cool.
casper said:
November 29th, 2007 at 11:35pm #
I just uploaded a sample that you can listen to on the Speak&Spell bending page.
wayn3w said:
November 30th, 2007 at 8:37am #
is the hold just connecting D1 to D2, perhaps by a switch or button? It’s not listed in the circuit diagram.
casper said:
December 1st, 2007 at 1:24pm #
Wayn3W:
You’ve got the right idea. Activate the “HOLD” effect by connecting D1 and D2 together. This can be done using a switch or a button. The “TONE” effect is activated by connecting E1 and E2 together.
jack said:
December 30th, 2007 at 10:08am #
hi, with the ‘depth trim’ is that a preset variable resistor or should i use a pot? and do you have a close up picture of the LFO unit. thanks x
jonifan said:
January 3rd, 2008 at 2:02pm #
hi, is the depth trim preset? or do you use a pot? x
bolig said:
January 13th, 2008 at 10:17pm #
nice! will this also work on speak & read units? genius as usual.
casper said:
January 16th, 2008 at 12:29pm #
Jack and Jonifan: the depth trim should be variable. I used a 10 turn trim pot.
Jack: click on the image above to link to a large picture of the schematic.
Bolig: This will work on any Speak&X.
vcfool said:
February 1st, 2008 at 10:32am #
Thanks Pete, works great!