A BETTER FLANGER - Electronics Today January 1987  [documentation]

Original effects with schematics, layouts and instructions, freely contributed by members or found in publications. Cannot be used for commercial purposes without the consent of the owners of the copyright.
Post Reply
User avatar
Tham
Information
Posts: 21
Joined: 29 Sep 2016, 23:52
Has thanked: 2 times
Been thanked: 16 times

Post by Tham »

Well, I am being retrenched from my job after over twenty years.

So while packing up my considerable belongings (like moving house, really), I happened to find this 30-year old Electronics Today International magazine still at the bottom of my side chair.

Looks like a pretty good design. Based on the TDA1022.

It seems the TDA1022 has quite high distortion and a low noise replacement is the MN3004 or SAD512.
Attachments
1.jpg
2.jpg
3.jpg
4.jpg
5.jpg
6.jpg
7.jpg

User avatar
Tham
Information
Posts: 21
Joined: 29 Sep 2016, 23:52
Has thanked: 2 times
Been thanked: 16 times

Post by Tham »

Does anyone know if there are direct pin-for-pin substitutes
for the TDA 1022 ?

TDA 1022 is a 16-pin IC while MN 3004 is 14-pin, and
SAD 512 is an 8-pin chip, and their pin layouts are different.

User avatar
uncleboko
Cap Cooler
Information
Posts: 509
Joined: 25 Mar 2008, 20:19
Has thanked: 58 times
Been thanked: 41 times

Post by uncleboko »

Tham wrote:Does anyone know if there are direct pin-for-pin substitutes
for the TDA 1022 ?

TDA 1022 is a 16-pin IC while MN 3004 is 14-pin, and
SAD 512 is an 8-pin chip, and their pin layouts are different.
No there are not, only TDA 1022 will do unless you have a............. (temp memory loss!) - you know what it's called - an adapter board I think!

I adapted this for SAD 1024 but never kept the details.

User avatar
uncleboko
Cap Cooler
Information
Posts: 509
Joined: 25 Mar 2008, 20:19
Has thanked: 58 times
Been thanked: 41 times

Post by uncleboko »

To run a TDA 1022 off 5 volts is disappointingly noisy and will have little headroom. I would have used 2 x 9v batteries to give it more beef!

User avatar
Dirk_Hendrik
Old Solderhand
Information
Posts: 4193
Joined: 03 Jul 2007, 08:44
Location: Old Amsterdam
Has thanked: 232 times
Been thanked: 887 times
Contact:

Post by Dirk_Hendrik »

Why "adapt"? The TDA1022 is one of the few BBD's that is rather easy to source.
Sorry. Plain out of planes.

http://www.dirk-hendrik.com

User avatar
uncleboko
Cap Cooler
Information
Posts: 509
Joined: 25 Mar 2008, 20:19
Has thanked: 58 times
Been thanked: 41 times

Post by uncleboko »

Dirk_Hendrik wrote:Why "adapt"? The TDA1022 is one of the few BBD's that is rather easy to source.
And it's good for the brain to adapt. I much prefer shorter delay of SAD 1024. A Hoax Flanger would be interesting with SAD 1024s.

User avatar
Fender3D
Cap Cooler
Information
Posts: 573
Joined: 08 Aug 2009, 02:40
Location: Helltaly
Has thanked: 121 times
Been thanked: 153 times

Post by Fender3D »

SAD1024 has not a shorter delay.
you may set it up to half chip or parallel-mux to have the same "buckets" as TDA1022. Otherwise it is a ...1024 stages BBD.
Parallel-mux will have a better resolution though....

User avatar
Fender3D
Cap Cooler
Information
Posts: 573
Joined: 08 Aug 2009, 02:40
Location: Helltaly
Has thanked: 121 times
Been thanked: 153 times

Post by Fender3D »

SAD1024 has not a shorter delay.
you may set it up to half chip or parallel-mux to have the same "buckets" as TDA1022. Otherwise it is a ...1024 stages BBD.
Parallel-mux will have a better resolution though....

BTW
unless you have a reasonable cache of SAD chips (and you'd better keep very secret your address, in this case...)
I wouldn't waste a SAD1024 for a magazine project, I'd keep it for "vintage" repair or EBay

User avatar
uncleboko
Cap Cooler
Information
Posts: 509
Joined: 25 Mar 2008, 20:19
Has thanked: 58 times
Been thanked: 41 times

Post by uncleboko »

Fender3D wrote:SAD1024 has not a shorter delay.
you may set it up to half chip or parallel-mux to have the same "buckets" as TDA1022. Otherwise it is a ...1024 stages BBD.
Parallel-mux will have a better resolution though....
I thank innit!!!

User avatar
uncleboko
Cap Cooler
Information
Posts: 509
Joined: 25 Mar 2008, 20:19
Has thanked: 58 times
Been thanked: 41 times

Post by uncleboko »

Ah but you can clock SAD 1024 considerably higher than TDA 1022, especially if double buffered by a couple of 4049 inverter arrays. So minimum delay is in the microseconds range, so a converted Flanger Hoax may benefit!!

User avatar
uncleboko
Cap Cooler
Information
Posts: 509
Joined: 25 Mar 2008, 20:19
Has thanked: 58 times
Been thanked: 41 times

Post by uncleboko »

I found Philips' modifications for lower noise operation of the TDA 1022!
Attachments
TDA1022_c[1].jpg

User avatar
uncleboko
Cap Cooler
Information
Posts: 509
Joined: 25 Mar 2008, 20:19
Has thanked: 58 times
Been thanked: 41 times

Post by uncleboko »

No luck with EH Flanger Hoax schematic, obviously kept very hidden!

Post Reply