Analog Delay Building Blocks

[aziltz]

Is there a definitive, or perhaps, basic, analog delay schematic floating around?

[R.G.]

Probably not definitive.

About the most basic ones would be the applications notes in the spec sheets for the Panasonic delay chips. Find those at hammer.ampage.org.

An analog delay is still a sampled-data delay; about all that's different from digital delays is that a) the resolution (bit depth) is theoretically infinite, although it's practically limited by noise and charge leakage issues and b) the signal to noise ratio gets worse with longer delays, where in a digital one, it is fixed by the bit depth/resolution.

[oldschoolanalog]

Here's a good place to start:
http://experimentalistsanonymous.com/diy/Schematics/Delay%20Echo%20and%20Samplers/
Have fun!

Dave

[frank_p]

Here's a good place to start:
http://experimentalistsanonymous.com/diy/Schematics/Delay%20Echo%20and%20Samplers/
Have fun!

Dave

  Is that sarcastic...
If so: 

[Mark Hammer]

No.  I think he means it's a nice assortment of delay schematics that will let you see common elements.

The basic "building blocks" will include:

a) signal preconditioning/splitter

b) pre-delay-chip filtering

c) delay chip and any required biasing

d) post-delay-chip filtering

e) clock generation circuit

f) wet-dry-mixing/output circuit

Add to this any companding or other approach at noise reduction.  There are some basic block layouts for flangers in several documents at my site.  Check those scanned issues of DEVICE.

[frank_p]

OK, Mark, thanks again, it's glued in my notebook !

Add to this any companding or other approach at noise reduction.  There are some basic block layouts for flangers in several documents at my site.  Check those scanned issues of DEVICE.

Yeah, I'm putting together a binder of your papers, GEO's and AMZ ones.  Digital-computer files get lost in all the folders and recycled paper is better for taking notes and underlining.

Somebody gave me TONS of 1,5 in² transparent acrylic pieces.  I have beguined to put building blocks on them.  The good thing about that method is that you see the components and the connections underneath.  Put a bit of velcro and car rug with that and you have a great experimentation platform.

[geertjacobs]

The PT-80 explanation is about how to simulate an analog delay with a cheap digital ic.
Very useful to learn about building blocks IMO.

http://www.generalguitargadgets.com/diagrams/pt80techinfo.pdf

[oldschoolanalog]

  Is that sarcastic...If so: 

No, not at all. I did mean...

... it's a nice assortment of delay schematics that will let you see common elements.

By "have fun" I mean; "welcome to the wonderful world of BBD madness!"
Speaking of B.B.Dementia (scroll down the page a bit):
http://hammer.ampage.org/?cmd=lt&xid=&fid=&ex=&pg=7
Fantastic compilation of BBD info there.

Dave

[jrod]

Howdy guys!

This is a cool thread. I'm new hear and it's fun to see something a little different - to me anyways.

Thanks!

[Mark Hammer]

Actually, you might find more info here: http://www.synthdiy.com/

People have been adding to their collection over time, whereas I haven't updated bbdementia in a while.

[frank_p]

jrod
Posts: 1

Welcome

[mac]

More than 15 years ago I was in Brazil for holidays, and I met a guitar player who was also EE. He showed me a very big box, the size of a shoes box, full of capacitors and resistors placed as in a railway, resistors in the steel, caps in the wood, or viceversa. It was an analog delay which sounded terrific. The idea is that every resistor and capacitor delay the signal by dT=RC. I do not know any tech data.
All I remember is that he talked about a long delay line and transistors.
Recently I posted about it, because the concept is in my head since then.

mac

[frank_p]

More than 15 years ago I was in Brazil for holidays, and I met a guitar player who was also EE. He showed me a very big box, the size of a shoes box, full of capacitors and resistors placed as in a railway, resistors in the steel, caps in the wood, or viceversa. It was an analog delay which sounded terrific. The idea is that every resistor and capacitor delay the signal by dT=RC. I do not know any tech data.
All I remember is that he talked about a long delay line and transistors.
Recently I posted about it, because the concept is in my head since then.

Similar ?

[aziltz]

No.  I think he means it's a nice assortment of delay schematics that will let you see common elements.

The basic "building blocks" will include:

a) signal preconditioning/splitter

b) pre-delay-chip filtering

c) delay chip and any required biasing

d) post-delay-chip filtering

e) clock generation circuit

f) wet-dry-mixing/output circuit

Add to this any companding or other approach at noise reduction.  There are some basic block layouts for flangers in several documents at my site.  Check those scanned issues of DEVICE.

i think i'm looking for sample circuits of these sections, would that be in the data sheets of the delay chips?

[oldschoolanalog]

This might be of interest:
http://www.diystompboxes.com/smfforum/index.php?topic=51633.0

[dthurstan]

Do any of these circuits show how to cascade bbds together? To make a massive long delay or multi tap delays!!

[oldschoolanalog]

Do any of these circuits show how to cascade bbds together? To make a massive long delay or multi tap delays!!

Page 32:
http://buildyourownclone.com/analogdelayinstructions.pdf
And:
http://www.generalguitargadgets.com/index.php?option=com_content&task=view&id=48&Itemid=26

[mac]

Frank,
Yes, but resistors instead of inductors.

mac