Here's an example using PWM, coded in Swordfish Basic.  It shows the circuit
and results:

http://digital-diy.com/swordfish/73-swordfish-tutorial-digital-to-analogue-conversion-dac-via-pwm.html





Here is a reference to an EDN Design Note using resistor ladders.  This
design is great because it only uses 6 values of resistors and can be 4
bits, 8 bits, 12 bits, etc.


http://digital-diy.com/forum/viewtopic.php?f=3&t=382
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