Looking for flanger schematic using mn3204 512-stage BBD

[armdnrdy]

It looks like you're good to go!

The orientation dot looks deep which shows that the top surface of the IC hasn't been sanded.

All of the markings look appropriate as well.

[Kevin Mitchell]

Sweet 

I was looking up BBD test circuits and I came across a conversation a few years back if you recall, I am interested in what you and slacker were talking about.
Frequency to voltage IC for analog delay rate indicator?

Ok then, here's a simpler way, build your generic test circuit with your clock. Build a simple pulse generator, this could be done with an opamps, a 555 timer or some other simple logic chips. Make this pulse at the delay times you want to test, connect it to a LED so you've got something that flashes at the delay time you want. Take the output of this and feed it into the BBD, take the output of the BBD and boost it so it will flash a second LED. Then it's the same deal as above, if the the delay time is what you think it should be the LEDs will flash in sync. Not very accurate, but it's good enough to tell you whether the chip is what it says it is.

This would be great. Has it been done yet?

I know there's this;
bbd test bed
It's not so straight forward and slacker's idea seems a bit more appealing to me. Any information is appreciated! I may have a mn3102 clone in before the weekend and I'd like to test all of the mn3204 chips before I do anything with them.

[armdnrdy]

If you want a simple way to test the BBDs...

Breadboard the application circuit in the data sheet.



I built the BBD tester for two reasons....to test BBDs...and to verify the number of stages. (make sure that they are not relabeled)

You're BBDs look good to me so...you just need to test them.

Edit: Most of the values aren't that critical. You are just testing yea or ney. The 3.3µf caps can be 1µf.

[Kevin Mitchell]

Alright. Any ideas on a simple guitar effect to test the BBDs? Like an echo, chorus or flanger? Something to validate the chip works as it should and to amuse myself. Otherwise I'm not sure how to use the datasheet's schematic to test them out.

[PRR]

Just FWIW:

BBDs are MOS devices. Also older. Very static sensitive. If they have been sliding in a plastic drawer all these decades, some may have failed from ZAP. The ones stuck IN the black/pink foam are less at risk.

[Kevin Mitchell]

Thank you PRR. That's why I'm itching to play with these. I'd like to test them all.

Once everything is all set I plan to build a mn3204 retrofitted FL99 (armdnrdy is the man!) I could test the chips that way.

Though in the mean time I'd like to put some of my efforts into modifying a simple effect such as Hollis's Ultra Flanger and get it to work with one or two 512 stage BBDs for testing and for fun.

For the ultra flanger I'd like to use the most simple circuit to feed the mn3102 (BBD driver) I could configure.
Could someone explain the workings of the pre-BBD driver section? I'm using the FL99 schematic as a reference for a 3102 driving two 512 stage BBDs.

[armdnrdy]

Though in the mean time I'd like to put some of my efforts into modifying a simple effect such as Hollis's Ultra Flanger and get it to work with one or two 512 stage BBDs for testing and for fun.

For the ultra flanger I'd like to use the most simple circuit to feed the mn3102 (BBD driver) I could configure.
Could someone explain the workings of the pre-BBD driver section? I'm using the FL99 schematic as a reference for a 3102 driving two 512 stage BBDs.

The Ultra Flanger uses a MN3007. That is a higher voltage BBD that is set up for a negative voltage.
To use the MN30XX series BBD with positive voltage...you feed the VDD pin ground...and the ground pin positive voltage.

If you want to "play" with a flanger circuit with yourMN3204s....you should choose one that uses the MN32XX series such as a MN3207.

[Kevin Mitchell]

Yes of course. Perhaps I'll tamper with the EM3207 (schematic) and tinker with a custom clock/driver section (I'd like it to be as small/simple as possible while being usable)

[armdnrdy]

If you want to tinker with something....

Here is my whole project file for the Boss BF-2 which takes a MN3207.

https://dl.dropboxusercontent.com/u/53299166/DIYstompboxes/BF-2%20project.pdf

[Kevin Mitchell]

Awesome! Thanks for sharing.