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Re: ADA Flanger calibration

1/8/2003 12:01 AM
bill bergman
Re: ADA Flanger calibration
I thought I had more pics, but I didn't. I'll have to take some. Give me a couple days.
1/4/2003 7:38 PM
Hi Mike.  
Your post sparked my curiosity.  
MN3010 specs:  
Clock Input Capacitance = 350pF max  
Clock Rise Time = 500ns max  
Clock Fall Time = 500ns max  
Scope capture of BBD clock signals, Rev4 ADA Flanger. Rise and fall times are within specs:  
SAD1024 specs:  
Clock Input Capacitance = 110pF max  
Clock Rise Time = 30ns max  
Clock Fall Time = 50ns max  
Scope capture of BBD clock signals, early ADA Flanger (Rev 2?). Rise and fall times exceed SAD1024 specs:  
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1/4/2003 8:01 PM
Mike I.
Re: ADA Flanger Scope Pics
Hi Dave,  
Thanks for putting those scope shots up! Nice to see. The observed rise/fall times for the SAD are shorter, as expected, due to less loading of the 4047 (assuming a 4047 is in the circuit...I have not seen an SAD-based A/DA schematic). The 4049 buffer in my modified clone reduces the rise/fall times considerably so they are within spec for the SAD. To my ears, there is a noticeable inprovement in the sound - better clarity - at the normal delay settings. I have clocked the SAD at up to 2.5 Mhz (meaning the internal osc of the 4047 is running at 5 MHz) which gives very short delays - without the 4049 the clock signal is very rounded with decreased amplitude. The MN3101/MN3102 clock chips are nice to use to drive any BBD as they have substantial drive ability compared to the more typical CD4013B approach. Now for the big question: is there much of a sonic difference between the two units (in-spec MN3010 vs. out-of-spec SAD)?
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