a rebote delay idea...

[dschwartz]

Hi all..
i had the idea of using a lfo driven panner to the output of a rebote delay, to make it pseudo-stereo, pseudo ping pong-ish...making the signal go left to right at different speeds and depths (like a speed and "spread" controls)

i thought of an astable multivibrator to drive 2 leds, one for each channel..but to control speed and depth it would need 2 dual pots..and i don´t like that..

a dual pt2399 delay rebote, with the panner at the input of the delay chips would work better, but seems like a lot of work..

maybe a sine-cosine oscillator? any ideas? thoughts?

[The French connection]

Hi! BYOC did a nice ping pong delay using two pt2399:
http://buildyourownclone.com/pingponginstructions.pdf schematic included...
sound really good BTW...

http://youtube.com/watch?v=oOzocTjGQYE

Dan

[frequencycentral]

Effectively you need a voltage controlled panner - two VCA's driven by one LFO, VCA 2 receiving an invertion of the LFO. Only one knob needed for speed, single gang. Another for depth.

Yeah?

[dschwartz]

yes i´ve seen that..looks great
but i think having a panner would give more original effects, at least i have never heard one..imagine your delay trail traveling from left to right, at a different rate that the repeat time..at high speeds, maybe will sound reverb-ey

[dschwartz]

Effectively you need a voltage controlled panner - two VCA's driven by one LFO, VCA 2 receiving an invertion of the LFO. Only one knob needed for speed, single gang. Another for depth.

Yeah?

you mean.. a single lfo driving two opamps, one non inverting and other inverting?

[frequencycentral]

VC panning is pretty awesome - use it on my modular - especially when the panning is driven by a gate referenced to the beat. You could use something like a trigger sensor driving a flip-flop to pan each seperate note.

[frequencycentral]

Effectively you need a voltage controlled panner - two VCA's driven by one LFO, VCA 2 receiving an invertion of the LFO. Only one knob needed for speed, single gang. Another for depth.

Yeah?

you mean.. a single lfo driving two opamps, one non inverting and other inverting?

Single LFO yes. Drive VCA 1 directly, VCA 2 via a single opamp inverter.

LFO > VCA 1
LFO > opamp inverter > VCA 2

the LM13700 dual transconductance opamp would do the dual VCA job - check the spec sheet.

[dschwartz]

VC panning is pretty awesome - use it on my modular - especially when the panning is driven by a gate referenced to the beat. You could use something like a trigger sensor driving a flip-flop to pan each seperate note.

hmmm..konichiwa?  didn´t get that last thing, but sounds like something that gets your rythm and pans at that rate?? hmm sounds great, but a little too sofisticated (at least for me)..

maybe a standalone LFO panner (tremolo if one side is used) is a better idea..

[puretube]

Panner at the outputs wouldn`t repeat clicks (ticks)... 

[frequencycentral]

author=puretube link=topic=68405.msg546844#msg546844 date=1212527252]
Panner at the outputs wouldn`t repeat clicks (ticks)... 

Could you drive the panner from the PT2399 rate LFO via a 4013 flip-flop though? That would do it.

[puretube]

Just divide the clock... independant of pre- or post-panning...

err... would take quite a few of flipflops, though... 

[dschwartz]

ehm..please describe a flip flop?
3 mentions in the threads deserve a reference...

[frank_p]

http://www.talkingelectronics.com/FreeProjects/5-Projects/Page16.html

[puretube]

1 flipflop divides by 2...

[puretube]

1 4013 contains 2 flipflops...

[frequencycentral]

Just divide the clock... independant of pre- or post-panning...

err... would take quite a few of flipflops, though... 

OK - use a CD4024 seven stage ripple counter to divide by 2, 4, 8, 16, 32, 64 and 128!