ampage
Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

 
Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  

Re: ADA Flanger calibration


 
1/8/2003 12:01 AM
bill bergman
email
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
Dave_S
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:  
 
 
 
  Monday
Book Of The Day The Ultimate Tone, Volume III by Kevin O'Connor
Have you ever wondered if there is a better way to build a Bassman, Champ, Plexi, an 800, AC-30, Bulldog or Portaflex? Or you wanted to build an SVT with off-the-shelf parts? How about a master-volume amp that doesn’t change tone with the master setting? Everything you need to know is right here, including: proper grounding techniques, wiring methods, and mechanical considerations. Eighteen chapters cover the “iconic” amps everyone knows and loves, with schematics and layouts for each, along with the technical history of the product. Eyelet-board and chassis-mounted tube socket construction is used throughout, for easy servicing and modding. TUT3 is very accessible even if you cannot fully read a schematic and is a "must have" if you are going to build an amp for your self.

Note: The Ampage Archive is an Amazon Associate site. A small commission is paid to the site owner on any qualified purchase made after clicking an associate link such as the one above.
 
1/4/2003 8:01 PM
Mike I.
email
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)?
 
<<First Page<Prev Page 4 of 4