Circuitbenders Forum
Circuitbenders Forum => Circuitbending discussion => Toys => Topic started by: smojo on July 08, 2011, 07:43:25 PM
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I'm currently working on a Speak and Read but struggling a bit. I'd love to find the picth bend on them but so far have only been able to drop the pitch a little with a cap across two points. Seen some on Youtube with a good range on a pot but can't seem to find a clock resistor to change like you can on simpler toys. Found some loops and sitortions but like to take it further. Any hints welcome please.
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You will be looking for three points on a Speak & XXXX toy for your pitch mod - pitch base, pitch up and pitch down. You will wire pitch base to the center lug of your pitch pot (probably a 100k pot) and the "up" and "down" points get wired to either side to give you a nice pitch sweep from a single pot. You will need to fine tune each side with a trimmer pot or fixed resistor to prevent frequent crashes at the extremes. There are plenty of schematics on line for the Speak& XXXX range, I think the Read is about the same as the Spell and Math, Casperelectronics has loads of comprehensive diagrams to follow. Have fun!
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cheers, I did find a bizarre pitch bend point by accident. Can't remember exact point but found it when I accidentally touched the batteries with one hand whilst searching with the other. It involved taking a tap from the mid point of the battery connection (3V) through a pot to somewhere on the board. Gives me a picth down bend. For now I've drawn a line on the project as it was taking so long to complete. Might go back to it some day but it has some cool loops and glitches so reasonably satisfied.