mictester wrote:Do you mean one on top of another, wired pin for pin? No. I haven't tried it, and it's unlikely to work. It also wouldn't reduce the noise....
I've found that if you give about 150µs pre-emphasis on the way in and the corresponding de-emphasis on the way out, you reduce the noise significantly while retaining a (more or less) flat frequency response. It's also essential to avoid clipping in the IC (there are several ways to prevent that). I also use a compander to compress on the way in and expand on the way out. I don't much like the sound of a single delay line, so I use three or four in parallel, each with different delays, and with convoluted feedback paths so that I get a whole mess of delayed signals at different repeat rates. If the straight to echoed signal ratio is set sensibly, I get a truly lovely "hall" echo effect at longer delay settings and smaller room sounds at shorter settings. I ended up using some preset resistors for the delay times, and selected them with 4066 ICs. One pedal that I make and I really like the sound of has short, medium and long preset delays, variable straight to echo ratio on a from panel pot and a "master feedback" pot to vary the overall amount of recirculated echoes. It uses both noise reduction tricks, four 2399s and has "tails". I've built a few of them now and their owners adore them! I'll put the basic circuit up on this site shortly.
karul wrote:Deadastronaut jamming on his prototype with 4 PT2399 delay prototype on breadboard.
Link
Another example is madbeans Zero Point SDX Delay
Link
Another one: cpm's - delay over the top PT2399's
http://www.soundclick.com/bands/page_so ... ID=8355105
viewtopic.php?f=28&t=9648
Haven't you noticed that there are lot of commercial delay/reverb pedals using belton brick(s) wich are nothing more than 3 PT2399's
A1full wrote:but wondered why some intermediate alternative, other than the PT2399 or switch to a dsp for something better, in the middle there is nothing?
mictester wrote:There are many echo / delay ICs available - both analogue (BBD) and digital. However, there's nothing wrong with the 2399 if you use it properly.
mictester wrote:I've found that if you give about 150µs pre-emphasis on the way in and the corresponding de-emphasis on the way out, you reduce the noise significantly while retaining a (more or less) flat frequency response. It's also essential to avoid clipping in the IC (there are several ways to prevent that). I also use a compander to compress on the way in and expand on the way out.
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