My new circuit - World Ender Trumpet Fuzz

[stonerbox]

For the first time.. I'm in love!   

[timd]

I have 2 4046 chips, and I was breadboarding another one of these, and couldn't get the output from pin 7 like in the schematic. I did have output on other pins though. Has anyone else tried this? I'm wondering if I have a bad second 4046 chip?

[earthtonesaudio]

I was expecting more of this:

[timd]

I was expecting more of this:

[timd]

The other day after removing power from the circuit, there was this really great sound that went from a high to low pitch very quickly - almost like a "death jingle" from an old video game. So, I rigged up a momentary switch to the positive wire from the power supply and it worked great: play for awhile, them press the switch and get the jingle. Cool stuff. The issue is that today, it is not working at all no matter what I do. The circuit is fine but no "jingle" when power is removed. Any thoughts?

[petey twofinger]

how about the sound an echo chip makes when it totally bottoms out , ever try that one tim ?

put a cds cell for the delay time on a pt2399 , get it feeding back a bit , then completely cover the delay time cds cell and hold it there ...

i had 3 p.a.'s on the volvo , under the hood . cds cells on the dash for the echo and a few circuit bent toys inside the console with switches  , and a casio vlone on cds mounted to the top of the the dash . i collected horns from the junk yard for years , we ended up with 13 sirens and horns including the 3 pa horns .

coga p.a. ( sampler type )  goin thru the delay , well actually it was a dano flange into a telephone style pitch shifter voice box , into the echo unit to the pa . i had a ton of power supply stuff ,  alil mini mixer , extra amps under the passenger seat . i speant a few summers doing all of it , and really pissed of the neighbors while testing it . i really wanted train horns but ... i had rca inputs next top the radio too . we used to plug in the speak and math or whatever and run thru stuff at stop lights , while trying to keep a straight face . then raise the speed / rate as we would accellerate , man we got some looks , folks would be thinking " some thing is really wrong with that old volvo ... "

my wife used to get a lil miffed about all this ... the kids and i enjoyed it quite a bit though .

sorry to hijack , i get sentimental sometimes . all that stuff axcept the flanger is still in the car , but my kid blew the motor and a lot of the stuff just aint workin now ... its prolly a good thing we arent neighbors , we would end up collaborating and getting arrested or fighting over toys at the local thrift store !

[timd]

how about the sound an echo chip makes when it totally bottoms out , ever try that one tim ?

put a cds cell for the delay time on a pt2399 , get it feeding back a bit , then completely cover the delay time cds cell and hold it there ...

i had 3 p.a.'s on the volvo , under the hood . cds cells on the dash for the echo and a few circuit bent toys inside the console with switches  , and a casio vlone on cds mounted to the top of the the dash . i collected horns from the junk yard for years , we ended up with 13 sirens and horns including the 3 pa horns .

coga p.a. ( sampler type )  goin thru the delay , well actually it was a dano flange into a telephone style pitch shifter voice box , into the echo unit to the pa . i had a ton of power supply stuff ,  alil mini mixer , extra amps under the passenger seat . i speant a few summers doing all of it , and really pissed of the neighbors while testing it . i really wanted train horns but ... i had rca inputs next top the radio too . we used to plug in the speak and math or whatever and run thru stuff at stop lights , while trying to keep a straight face . then raise the speed / rate as we would accellerate , man we got some looks , folks would be thinking " some thing is really wrong with that old volvo ... "

my wife used to get a lil miffed about all this ... the kids and i enjoyed it quite a bit though .

sorry to hijack , i get sentimental sometimes . all that stuff axcept the flanger is still in the car , but my kid blew the motor and a lot of the stuff just aint workin now ... its prolly a good thing we arent neighbors , we would end up collaborating and getting arrested or fighting over toys at the local thrift store !

Very true! I like my thrift store hack experiements too much! I wonder about using a momentary stomp on a pt2399 circuit...Say you had a pot that controlled the echo time off pin 6 and then rigged that up to a momentary switch to cut out the resistor (pot) to pin 6....I wonder if you could get a cool echo trail while you held the switch down...

[petey twofinger]

i have always removed that resistor . when ever i mod pt2399 i remove 3 resistors and then substitute them with pots . with the pot in place i feel the resistor is completely redundant . if you choose to leave the resistor in place it will not be able to FULLY glitch out but this comes with a price . -

looking at the datasheet it has a chart that shows what the delay time will be with different values of resistors .

the last entry or minimum delay time 32 milliseconds with a .5 ohm resistor or something , then for the max delay time 342 ms (ha) it is like  27.6k or some value resistor , i cant remember now .

what happends if you do not use a resistor and just cut in a pot is something like this . lets say that you turn the unit on and the last time that you used it you had the pot set on max delay time OR minimum . when you turn it on  with these " improper amounts of resistance it will not echo at all . then you have to shut it off , adjust the pot , turn it on again and then you have echo . so if one was building this for resale or wanted it more fool proof , i would think utilizing a bypass switch for that timing resistor that is stock would be the best . call that switch " delay time expander , or glitch or whatever ... it is frustrating , because i didnt realize this and just hacked all the stuff , removing the resistors and cutting in the pots .

my favorite pt2399 is a hanna montanna , in a mini cigar box , just under a shelf in my work area . it is modded for delay time  , feedback or repeats , then there is a level control too . it is attached to a "mixer" for my satellite radio / mp3 and it powers a "nice" book shelf speaker from goodwill . i have to constantly tweak the echo time , if its set long but i enjoy it .

how about making an led blinker circuit and have the blinky led by the delay time photocell . get a voice changer , put the mic element in a tube with a mini speaker or ear bud at one end . satans slide whistle ...

i wonder if a single cds could work on a chip oscillator  for pitch AND a pt2 chip for the delay time , then go with a dino segovis slide synth style controler .

what is really odd is the pink barbie guitar that looks like the hanna montanna , it also has a mic input and echo knob , but when you open those they have a different layout , massive pcb , amd it seems to me the echo is contained in a black blob which i spose could be depending on how few components one needs when repurposing said blob .

[timd]

The bypass switch idea seems good. I had the Barbie circuit too and didn't have a lot of fun with it trying to make it an echo, so I made a dirty tremolo with it:

Sorry for the bad video quality - that was my old camera. The Hannahs come in 3 different styles from what I've seen - 2 have echo and 1 doesn't. Besides the resistor from pin 6, what 2 others are you removing for pots? I usually remove the pin 6 one for a pot, add a master volume, and try to find a creative bend or two for the other pots.