Follow Slashdot stories on Twitter

 



Forgot your password?
typodupeerror
Note: You can take 10% off all Slashdot Deals with coupon code "slashdot10off." ×

Comment Re:Cool but... (Score 1) 126

Bingo on the annunciators and the button inputs. But I did intercept the TTL output of the speaker flipflop. That is a much cleaner signal than what comes out of the AC-coupled speaker amplifier, and it is readily available on a solder pad intended for an integrated audio amplifier chip that was never populated on the Apple //e boards. This TTL level is actually full of digital noise, as you would expect, so it is used to drive an inverter powered by a "quiet" +5v level created from the +12v supply to the audio processor board. The output of this inverter is clean, and is mixed with other similar outputs prior to being filtered by a three-pole Sallen-Key lowpass filter to eliminate the 22.05kHz PWM pulse frequency. -michael

HOLY MACRO!

Working...