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PC-SIG: World of Games
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PC-SIG World of Games (CDRM1080710) (1993).iso
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MAKE_DAC.DOC
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1992-07-11
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Building a DAC:
---------------
Well...although there are many different ways to build yourself a DAC,
I'm only going to demonstrate 1 way...the simplest and cheapest way <g>.
Ingredients:
1 25 pin male D type plug
8 resistors, in ratios of approximately 1:(2:4:8:16:32:64:128), such as
5k1Ω, 10kΩ, 20kΩ, 39kΩ, 82kΩ, 160kΩ, 330kΩ, 620kΩ
a 390Ω resistor
a 100nf capacitor to smooth the signal out
some insulated wire to connect it all up
something to build the circuit on, such as some stripboard
a socket for the output to connect it to your amplifier
an amplifier
Instructions:
100nf
┌─█├───>signal to amp
│ ┌────>ground to amp
│ │
390Ω▒▒▒
┌────┬─────┬─────┬─────┬─────┬─────┬─────┤ │
5k1Ω▒ 10Ω▒ 20kΩ▒ 39kΩ▒ 82kΩ▒160kΩ▒320kΩ▒640kΩ▒ │
┌┴────┴─────┴─────┴─────┴─────┴─────┴─────┴─┴┐D plug
└┬────┬─────┬─────┬─────┬─────┬─────┬─────┬─┬┘
pin number 2 3 4 5 6 7 8 9 25
Build the circuit, as shown above, and connect it to your amplifier
(maybe active walkman-style speakers, or a stereo system), plug it into
your parallel port and tell DOMINATION that you have a Mono/1 DAC on
whatever parallel port you plugged it into. You can build two of these,
and then tell DOMINATION that you have a Stereo/2 DAC if you want stereo
explosions <g>. More ways to build better DAC's are available in the
file 'hardware.doc' that comes with Mark J Cox's MODPLAY program,
and his Stereo-on-1 and DAC's that use a ZN426E chip sound better,
but are harder to build. When you have built and tested this DAC you
should put it in a case to prevent it from short-circuiting, and possibly
damaging your computer.