SPO256 Speech Board
Board Specs //
Board Options //
**Sorry: Out of Production.**
Visit SpeechChips.com for PCB and SPO256 availability.
***For my SpeakJet SuperCarrier board, see speechchips.com***.
Double-sided boards, top (L) and bottom (R) views.
Version 3.0 [Photo of older version of board.]
(Completed board view.)
For sale: PCB for SPO256 speech chip for robot voice [does NOT use
the CTS256 chip].
I originally had some made up for myself and made a few extra. By selling
some to others I could increase my order volume and get the per board
price down and you could get some, too. [This originally was not a money-making
proposition - just a fellow robot-builder sharing some resources. But now I'm selling these
slightly above my cost because of their super-high quality, and because of my investment.
Please inquire about educational discounts.]
$10.00 each. - - - Money Order, Personal Check, or PayPal [including credit cards] accepted.
Shipping: US First Class mail $1.00 OR $4.00 for US Priority Postage.
[Outside of US will be more - please inquire] Shipping cost is relatively constant even if ordering multiple boards.
Please tell me (Jim Hewitt) how many you'd like.
The newest boards include some new features:
support for OOPic SPO object [requires minor modifications; ask for documentation]
support for on-board voltage regulator
ALL SPO256 pins brought out to optional headers for experimenters
For a limited time I also HAD a very few kits of components for the SPO PCB
(MINUS the SPO chip). These can be added to a PCB order. See link for kit pricing.***Discontinued!***
I have soldered up two of the ORIGINAL
boards to verify that the work.
I have also soldered up a few of the new ones [they are much nicer to solder!] and they also work.
They no longer have the small holes problem.
I'll also be glad to answer any other questions you may have. Send
me (Jim) mail. Construction details and
sample controlling code will be available soon - but I assume you can
solder up a board if you know where the components go.
[And sorry - I do NOT have any extra SPO256 chips. But
Ken Lemieux may still have a few more.]
[Actually, I do have a very few spares now, but we'd need to negotiate a price/trade for one with a PCB.]
Small board size [hence the nested chips]
Few control lines 
Some construction options
High quality circuit board
Layed out with ExpressPCB s/w. [Visit Express PCB site (Manufacturing
Specifications for Production Service) for more information about their product.]
Double-sided, drilled, solder reflowed
4 mounting holes on corners
Pretty small [1.5" x 2.5" (ca. 3.8 cm x 6.4 cm)] and fairly densely packed
the shift register is UNDER the socket for the SPO-256
bits are clocked out from LSB to MSB
This board equires a moderate level of soldering proficiency and a fine soldering iron.
Uses shift register to convert serial input [NOT RS232 serial] to parallel for SPO256.
Only requires 4 lines to control:
C - CLK for shift register [pin 0 in circuit below]
I - INA for shift register [pin 1]
A - ALD allophone load for SPO256 [pin 2]
L - LRQ for SPO256 [pin 3]
Note: This board does NOT use the CTS256AL2 text-to-speech chip. [It would seem that
both SpeechChips.com and
JDR still have
some of these chips, though, if you're looking for some.]
However, you could easily use this board to hold the SPO chip and amplifier and connect
it to your own CTS circuit. All necessary pin connections do have an available solder
pad for off-board connections. [If you want help, just ask me (Jim).]
Additionally, there is a socket for a 12C508/9 PIC which can reduce
control pin count down to 2, or even to 1. This would also allow the
line-twiddling to be offloaded from the
Stamp or whatever else is the master controller. I've done the bulk
of the code with some debugging and fine-tuning left.
Both the PIC and audio amp [LM386] are optional and there is a
provision for adding either an LED on-indicator OR a separate power
supply for the amp. Amp gain is 200 and seems to be adequate with 5v supply.
There is some room for a
trimmer cap for the crystal in case your SPO256 chip is
overly sensitive to the clock stability [as one of mine is].
The board can also be fitted with a 5v voltage regulator if you can't provide it with a regulated supply. But this option is not recommended.
NOTE: The following circuit schematics originally came from Jon Williams' article "Using the SPO256-AL2 Speech Allophone Processor" in the June 1998 issue of Nuts and Volts [Volume 40]. Go to the Paralax site, Downloads, Nuts and Volts columns for more useful stuff!
Note: I originally found the gif of this circuit
TheOneSpot - Robotics - Text 2 Speech but that link appears to be broken. :-(
Note that the output pins QA-QH from the shift register [74HC164]
are swapped MSB for LSB going to the SPO256 chip. This greatly reduced
the difficulty of the trace routing for the nested shift register
[which was nested to conserve board space].
Audio Amp circuit:
Original audio circuit gif.
Gordon McComb's Budget Robotics
Maybe more when I get more time...
This page made of 100% recycled bits.
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