Audio Delay Circuit

[George]

Does anyone have a schematic of an audio delay circuit capable of taking the
output of a radio and delaying it five seconds or so before passing it to
the speakers?

Thanks,

George

 

[Jim Thompson]

Does anyone have a schematic of an audio delay circuit capable of taking the
output of a radio and delaying it five seconds or so before passing it to
the speakers?

Thanks,

George

Tape loop?

...Jim Thompson

 

[George]

Yeah, I thought of that but was hoping for something solid state. Sorta
like this device http://delayplayradio.com/ only do it yourself cheap.

George

 

[Don Bowey]

Yeah, I thought of that but was hoping for something solid state. Sorta
like this device http://delayplayradio.com/ only do it yourself cheap.

George

So why waste people's time by not including that insight in your first post?

I estimate from the fact that you are a top poster, that you are somewhat
oblivious to....

 

[martin griffith]

Does anyone have a schematic of an audio delay circuit capable of taking the
output of a radio and delaying it five seconds or so before passing it to
the speakers?

Thanks,

George

depends on the quality that you want

http://www.eetchina.com/ARTICLES/2003AUG/PDF/2003AUG29_AMD_AN02.PDF




martin

 

[martin griffith]

Tape loop?

...Jim Thompson

Nope, he said "circuit", not wierd, still fashionable, analogue tape,
I wuz an xpert 1nce onit. You just try and buy a 3 head deck, you are
stuck. Then you have to get some tape.......Quantegy (ex ampex) are
the only guys these day who do Real Tape


martin

 

[Jamie]

Does anyone have a schematic of an audio delay circuit capable of taking the
output of a radio and delaying it five seconds or so before passing it to
the speakers?

Thanks,

George

door spring ?

 

[Rich Grise]

Yeah, I thought of that but was hoping for something solid state. Sorta
like this device http://delayplayradio.com/ only do it yourself cheap.

George

Well, "cheap" and "it works" are sometimes incompatible goals ;-) .

I once designed a little FIFO using an Intel 8748, which, depending
on how much you wanted to spend on RAM, could be extended to be
arbitrarily long. This was for a strip chart recorder that had
a little different clock rate than the processor (80186) that
controlled the unit. (4-channel remote heart rate monitor). At
audio frequencies, all you'd need would be the ADC, the FIFO,
and a DAC. The DAC part is almost trivial, and these days, ADCs
are almost free. I'd have to do some study to give you any more
definitive answer about the FIFO RAM, however.

Good Luck!
Rich

 

[Rich the Newsgroup Wacko]

So why waste people's time by not including that insight in your first post?

I estimate from the fact that you are a top poster, that you are somewhat
oblivious to....

Oblivious to what, exactly? ;-P

Cheers!
Rich

 

[Rich the Newsgroup Wacko]

Nope, he said "circuit", not wierd, still fashionable, analogue tape,
I wuz an xpert 1nce onit. You just try and buy a 3 head deck, you are
stuck. Then you have to get some tape.......Quantegy (ex ampex) are
the only guys these day who do Real Tape

martin

OK, here ya go:

[mic]---[PC sound card]---[FIFO S/W]---[PC sound card]---{speaker]

;-P

 

[Rich Grise]

door spring ?

For five seconds? How big is your back yard?

Find a radio or TV station that's upgrading, and snag one of _their_ five-
(actually, I've heard that it's seven-) second delay units that they're
retiring.

Good Luck!
Rich

 

[Ken Smith]

Does anyone have a schematic of an audio delay circuit capable of taking the
output of a radio and delaying it five seconds or so before passing it to
the speakers?

One of many 8051s with ADC and DAC plus an external RAM chip would do it
to about 12 bits at perhaps 100KHz.

 

[moby]

Does anyone have a schematic of an audio delay circuit capable of taking the
output of a radio and delaying it five seconds or so before passing it to
the speakers?

Thanks,

George

Sorry, never got round to doing a schematic for it but the dead
simplest audio delay I've ever made centred on a CS4231 audio codec, an
NEC 42280 265k*8 field buffer, an HC245 and a MCU (in my case, a 89C52)
The MCU loads up the config registers of the codec then the codec and
the memory talk to each other ad infinitum. The field buffer memories
are particularly good for this app because you dont need to worry about
the addressing - they just look like a big fifo. The 4231 can do
everything from 16 bit 48k stereo down to 8 bit 8k mono depending on
what you plonk in the config registers. Blurry pic at :
homepages.kcbbs.gen.nz/moby/delay.jpg
cheers
M

 

[Clive Tobin]

Does anyone have a schematic of an audio delay circuit capable of taking the
output of a radio and delaying it five seconds or so...

I am surprised that nobody has suggested an analog bucket brigade
delay. These used to be made by Reticon and I think Panasonic still has
them, the last time I looked in the Digi-Key catalog. Fidelity is not
wonderful and biasing can be touchy. I don't know how many stages are
still available.

 

[[email protected]]

Tape loop sceptics could look at:

http://home.swipnet.se/sonoloco12/fylkingenevents/loop.html
"To pass over the looping tape "safely"
you had to use this ladder..."

http://arts.ucsc.edu/ems/music/equipment/analog_recorders/Analog_Recorders.html#Loops
"Short loops are very easy in the UCSC Studio.
Above each tape deck there is a counterweighted
pulley on a string . . . The very longest loops require
the use of a microphone stand. Thread the loop around
one or two pulleys and a mic stand placed where it will
do the most good. In cramped quarters you can pass
the loop through pulleys and then back over your shoulder."


www.valveamps.com/ wemjoker.htm
"Preamp with integral tape loop echo"

http://www.stevesmusiccenter.com/FulltoneTubeTapeEcho.html
http://www.superpage.com/riffs/desc_maestro_echoplex.html
http://www.harmony-central.com/Features/PlugInformats/mainpage.gif
HA! Fooled me, this one is a fake. Software emulation of a tape loop!!!
"Karlette is a realtime VST tape-loop echo emulation plug-in"


http://prosoundweb.com/recording/tapeop/edit/edit_11_13.shtml
"An Intro to Analog Tape Splicing and Editing and Tape Loops"
http://johnroach.net/simultaneous/archive_mad_12_17_roach.html

www.ampaholics.org.uk/ selmer5_photos__p5.htm
"www.ampaholics.org.uk/ selmer5_photos__p5.htm"

 

[Rich, Under the Affluence]

Tape loop sceptics could look at:

http://home.swipnet.se/sonoloco12/fylkingenevents/loop.html
"To pass over the looping tape "safely"
you had to use this ladder..."

"If one sings into the first recorder and has this feedback running, one
can start to sing in polyphony with oneself...."

That's what I want to do. A one-man babershop quartet. ;-P

Couldn't that be done with some software and an ordinary sound
board?

Thanks,
Rich