EZTec Talk n’ Learn Alphabet Center

EZTec Talk n’ Learn Alphabet Center

This EZTec Talk n’ Learn Alphabet Center was incorporated within my initial circuit bending spending spree. I compensated $5.00 for this, that was a little much I must admit. However I was after it since it spoken and believed that it could have several exactly the same abilities like a Speak n’ Spell or Speaking Teacher. However, it didn’t. It’s a black blob.

However it still was fun to try to bend. Unbent, it’s four modes: One where are looking for the letter around the interface, one in which you press instructions also it states the term above it, one in which you press the letter also it spells and states the term above it, and lastly one mode where it simply states the letter and that’s it. This toy runs from 4 AA batteries.

Bending this item just because a work of determination. I understood it had not only a pitch resistor which i could replace, but it didn’t release its secrets so easily and that i wound up poking every location around the PCB with a number of caps, resistors and diode. This bent instrument incorporates the very first variable distortion which i have put in a toy. Initially it had been just likely to be full-scale noise, but before wiring all of the bends up, I remembered which i had not attempted a potentiometer onto it. It had been instant success, because the first pot I attempted (a 50K straight line) was the right fit and i believe is the greatest thing about this project.

The worst a part of of the bending project was the audio out. I don’t know why audio outs happen to be giving me such greif recently. It is a farily easy process. However this one especially had been an entire discomfort. Using the original wiring, it might play all right though my bass amp. However when I’d plug it in to the computer it might do nothing at all except emit a couple of random pops and snaps. I believed it needed to be a grounding issue. Within the finish, I re-adjusted generate income was wiring the audio out (the firOrfour in jacks I personally use have 4 rods and just what does what happens to be questionable), also it finally would play with the computer, although it grew to become a little more unstable even if your audio out was disconnected. *shrug* Well i guess.
In most I’m pleased with the way in which that one arrived on the scene, particularly the appearance from it. I spent a substantial amount of time trying to puzzle out the perfect place for everything and ensuring everything wound up on a single line.


1) Pitch mod – This is often switched off and on having a toggle switch. Within the off position, it uses the initial pitch resistor. Within the on position, it runs via a 500K straight line potentiometer (I believe).
2) Dial-A-Distortion – This is often switched off and on having a toggle switch. When switched on, it runs via a 50K pot with a few additional resistance put into prevent crashing. The knob I made use of has got the letters SQL onto it. Unsure what it really originated from, but I love to refer to it as the squeal knob since that exactly what the distortion seems like.
3) Low-pass filter – This is actually the eco-friendly button. A 10uF cap between points takes the very best finish from the seem being performed.
4) Start-up loop – Once the rocker turn on the best is switched on, it causes the the toy to reset again and again. Whatever you get may be the first tone within the startup sequence.
5) Click mod – Once the rocker turn on the left is switched on, it leads to a steady rhythm of clicks to become released in the speaker. Little else makes noise. Just a lot of clicks. When both left and right rocker switches are switched on, the Super Click mod is activated. Still a rhythm of clicks, but it is now a lot more like a trotting horse. *click**click**click* &nbsp&nbsp&nbsp *click**click**click*. This sounds great when slowed way lower.
6) Volume Brought – A little 3mm Brought pulses towards the sounds. (Presently disconnected)
7) 1/4" audio out
8) Rewired reset switch – The toy itself were built with a reset switch in position, but to be able to reste the toy, you’d to maneuver the mode selector completely right, that we discovered to be a large discomfort within the but. And So I wired up a DPDT momentary toggle to consider it’s place. Labored out great when testing for modifications. I possibly could reset around the Spell mode without getting slowly move the selectory completely over and again. I can not let you know the number of occasions I heard "u-m-b-r-e-l-l-a — umbrella".


front view

detail view

eztec-alphabet-center.mp3 – Just me toying around with this particular project. You know the dial-a-distortion whenever you listen to it.

1) I still need understand why the audio out is responsible for the entire factor to get really unstable. It truly bothers me alot since adding the audio out ought to be the easiest mod of. grrrr.
2) Wire in the Brought. I believed the diode may be resulting in the problems however it seems that isn’t the situation as it is still flakey even when they’re not connected.
3) The rate and distortion take some fine tuning. I added resistors towards the containers to avoid crashing. These labored great after i had everything alligator clipped together, however once soldered in position, there’s slightly less resistance so at the very top finish of both mods, the toy has a tendency to crash.

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