Increasing Rebote 2.5's delaytime

[alfafalfa]

you need more delay time than that (i.e., if what you are trying to mimic in Gilmour's sound involves longer delay times), then perhaps you need to look at the PT2395 chip, which will deliver up to 800ms with the appropriate DRAM chip.

by Mark Hammer

When reading this I wondered if it would be possible to just swap the delay chips in the Rebote.
Change the 2399 for a 2395 , does this make sense ?

I prefer to use the Rebote's longer delaytimes and would like to get rid of the noise and distortion which are a sign of the shortcomings , if I may put it like that, of the 2399 Princeton chip.

Alf

[Andre]

Check the datasheets and you will see that PT2399 is 16 Pin DIP and PT2395 is 40 pin DIP, and next to that PT2395 needs an extra DRAM memory chip, so no, it doesn't make sense  .

I'm not sure anyone on this forum did a PT2395 based delay.

André

[alfafalfa]

Oh oops, I just assumed they had the same pinout !!

Thanks , Alf

[Mark Hammer]

I was secretly hoping that the PT2399 and the HT8955 (used in Dean Hazelwanter's SHecho project, which also incorporates outboard RAM, like the PT2395) might share the same pinout, but sadly the 2395 is a 40pin chip and the HT8955 a 24-pin.

[igor12]

build PT80, longer delay time

[soggybag]

The PT2399 is limited in delay. But you can extend the delay by the resitance applied to pin 6. 50K is recommended. But a 100K pot works. Longer delays start to sound grainy and lo-fi.

[caress]

ken stone has a development board for a pt2395 based delay...

here is the schematic:  http://www.cgs.synth.net/modules/pic/schem_cgs44_ddb_d.gif
and here is ken stone's great site:  http://www.cgs.synth.net

[Mark Hammer]

And as he notes, you can buy the board from him for $15, which, when you see the board, is a reasonable price as far as commercially produced boards go.