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The Education Master 1994 (4th Edition)
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EDUCATIONS_MASTER_4TH_EDITION.bin
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progmisc
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digitol1
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digitize.txt
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1989-01-05
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74 lines
NOTES FOR THE VOICE DIGITIZER CIRCUIT
1. You can print the schematic and all documentation with the
PRINTALL.BAT file.
2. The author left out some important parts of the circuit
in the schematic, so use the one in this file.
3. You can only print this schematic on an EPSON-compatible
printer.
4. I used batteries to power this circuit. It requires 12V,
which means 8 AA batteries. You could also use a 12V power
supply, but it has to be **QUIET**. I think the batteries
are easier. Since the circuit will only be on for a short
time, they should last just about forever. NOTE: The circuit
designer says that this should run just fine on 18V, so two
9V batteries in series is a cheap solution.
5. Wire this circuit carefully and don't screw up any of
the connections. Take your time.
6. Wiring layout isn't critical. You should see my sloppy
circuit board.
7. Unfortunately, the RECORD.EXE file doesn't work on some
computers. It has to do with the timing chip. Systems that
definitely DO NOT work are COMPAQ portables and SHARP 7000
series lunch-boxes. I've tested this on about 10 other PCs
without difficulty. TANDY, as always, is questionable.
8. Cost for the electronic components should run about $15,
but the cabinet and other hardware bring the price up. For
resistors and capacitors, go to the counter and just buy
what you need. Avoid the packaged goods.
9. USE SOCKETS FOR THE ICs!
10. Observe polarities on the electrolytic capacitors.
Serial Port Notes:
If you have a DB-25 connector on your serial port, the pins
for this circuit are:
CTS ---------- Pin 5
Signal Ground -- Pin 7
If your serial port has a DB-9 connector, pins are:
CTS --------- Pin 8
Signal Ground -- Pin 5
FINAL NOTE:
When you first try this circuit, don't be surprised if it doesn't work.
The adjustment of the 50K pot is critical. For me, it
worked almost exactly in the center of the pot's travel. Experiment!
GOOD LUCK!
George Campbell
1472 Sixth St.
Los Osos, CA 93402
CIS 71571,222
GEnie G.CAMPBELL
SLO BYTES BBS
(805) 528-1759
SysOp: George Campbell