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1993-08-20
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DACPLAY Version 1.0
(C) 1993 Kevin Patterson, KHP-UNISystems Co.
Sound Hardware Circuits Document
This document is supplied to provide simple universal circuits for use
with DACPLAY and other programs. These are inexpensive devices the
produce sound output that rivals the quality of the original Sound
Blaster.
I. A Simple Single Chip D/A Converter
The following is a simple circuit hight quality sound, and
requires only a few components. This circuit will work with other
software, such as Mark J. Cox's MODPLAY and MODRES, which play amiga
sound files on your PC. It even sounds better than a Sound Blaster
for digital audio!
You will need:
IC1 ZN426
C1 10 uF electrolytic capacitor, 10V+
C2 4.7 uF electrolytic capacitor, 10V+
R1 330 ohm resistor, 5%, 1/8 watt
RJ1 Female RCA jack for line-level output to your amplifier
RJ2 25 pin male D-type (DB-25) connector for your parallel port
A +5v supply
ZN426E +5V
RJ2 ┌--------┐ │
(2) D0 ---┤9 14├--┤
Pins in () (3) D1 ---┤10 │ ┌┴┐
are on the (4) D2 ---┤11 │ │ │ R1 330 Ω
DB-25 con. (5) D3 ---┤12 │ └┬┘
(6) D4 ---┤13 5├--┤
(7) D5 ---┤1 6├--┤ +
(8) D6 ---┤2 4├--│--------┤ ██----Θ RJ1
(9) D7 ---┤3 7 │ │ 10µF │
└----┬---┘ -┴- + │
│ ▐█▌ C1 4.7µF │
│ │ │
(24) ------------┴------┴----------------┘
(25) ------------┐
│
═╧═
╤ GND
Depending on your amplifier, if the above circuit sounds poor,
try removing the 10 uF capacitor. This circuit automatically shuts
off when the DB-25 connector is unplugged from the computer.
The ZN428 is made by Ferranti or Plessey, which are UK
manufacturers. It is an excellent chip, but it's hard to get. I
obtained one from EasyTech, a mail-order electronics supplier listed
in most electronics magazines.
II. An Alternate DAC
If you can't get the ZN426 you can use a DAC0800, DAC0801, DAC0803
from National Semiconductors in the circuit below.
DAC 080x
DB-25 ┌--------┐ 0.01µF 0.1µF
(2) D0 ---┤12 16├--┤ ██----┤ ██--┬--- GND
(3) D1 ---┤11 │ │
(4) D2 ---┤10 15├---------██████-┘5kΩ
(5) D3 ---┤9 │
(6) D4 ---┤8 14├---------██████-┐5kΩ
(7) D5 ---┤7 13├----------------┤
(8) D6 ---┤6 2├--┤ ██----------┴-- +5V
(9) D7 ---┤5 3 1 4├----------┤ ██-----------Θ RCA
└--┬-┬---┘ 0.1µF + 10µF │ out
└-┤ │
│ │
(24) ------------┴-----------------------------┘
(25) ------------┐
│
═╧═
╤ GND
The 0.01 uF and 0.1 uF capacitors are ceramic. Depending on your
amplifier, if the above circuit sounds poor, try removing the 10 uF
capacitor. This circuit automatically shuts off when the DB-25
connector is unplugged from the computer.
This document is (C) 1993 KHP-UNISystems.
Amiga is a registered trademark of Commodore Computer Corporation?