9V Electric Mistress project file done (Bernardduur??)

[Bernardduur]

Just checked the clock frequencies.

With the clock trim at 50% (lugs 1 and 3 are wired like in Stephen's schem), the rate pot at 0% and the range pot at 100% the clock frequ range is from ~29kHz to ~212kHz, with the trim at 0 or 100% the range is from ~172kHz to ~880kHz (measured after the flip flop).

If my calcs are correct this would give a flanging freq range of 226-1666 Hz (clock trim at 50%) and 1342 Hz to 6874 Hz. Please correct me if I'm wrong.

Just out of curiosity:  Bernardduur could you do me another huge favour and measure the clock frequency range on your unit at pin 1 or 2 of the 4013 (with rate pot at 0% and range pot at 100%) ? Thanks a lot in advance.


I believe there is still some volume drop (although I added the mods like in Bernard's unit) compared to true bypass but I can't say for sure since I did not connect the circuit to a stompswitch.

Regards,

Markus

I would love to.... but how should I do this?

[markusw]

I would love to.... but how should I do this?

I asked for this favour on the assumption that every DMM has a frequency counter, which I now realise might not be the case

Thanks anyway!!

Markus

[markusw]

NICE.
Thank you very much

A HUGE thanks for all the hard work, R&D, layout, debugging,(the list goes on...) you did on this effect! You have done a truly great thing sharing your efforts with all of us. Guess it's time to finally build one
Thanx again, and all the best,
red

Kudos to Stephen, Francisco and Bernard......and obviously EH.

Glad you like it

Markus

[nelson]

Thank you !


Great work Mark.

[StephenGiles]

I appreciate your appreciation!

[tiges_ tendres]

today I feel like that song: Always the last to know!!

I have been wanting to build a flanger for some time, but the ac version was a bit past my capabilities.

I just traded this guitar
<a href="http://photobucket.com" target="_blank"><img src="http://img.photobucket.com/albums/v260/tenderstems/starstream2.jpg" border="0" alt="boo hoo, woe is me"></a>
for an old (I wont say vintage, I don't know how old it is) AC deluxe electric mistress.  It doesnt have a grounded prong if that helps.

If I had seen this thread two days ago, I would have held out for cash instead!

dag nab it!

Also, sorry to hijack this, but does anyone know if the originals had sockets for some of the IC's.  In my pedal, the SAD chip and the CD40... are both socketed.  Weird? or repaired?

this is a great project!!! 

[markusw]

If I had seen this thread two days ago, I would have held out for cash instead!

Sorry about that!

BTW, just uploaded a corrected version (the note about the 200 ohm ps resistor was missing).

Also, sorry to hijack this, but does anyone know if the originals had sockets for some of the IC's.  In my pedal, the SAD chip and the CD40... are both socketed.  Weird? or repaired?

In Bernard's 9V non-deluxe Mistress the SAD and the 4013 are also in sockets.

Markus

Edit: forgot another note...adedd..
Edit: just found another bug re C1 and C2 value note....corrected...

[tiges_ tendres]

If I had seen this thread two days ago, I would have held out for cash instead!

Sorry about that!

BTW, just uploaded a corrected version (the note about the 200 ohm ps resistor was missing).

Its my fault!  I'm just glad I can have a shot at my own.  No, not glad, very grateful.  Thank you!

[darryl]

Well Markusw, after looking over your schematic I had to make to changes to my layout of my Mistress. I had a 1N4001 on the 311 IC and the clock pot wired as a variable resistor. I changed these 1N4001 to a 1N4148 and pot wired correctly, works perfect no tick no thump just perfect Flanging. This is an incredible Flanger the long swoosh it has is great, thanks again to you Mark,Stephen, Francisco and Bernard. These are the kind of pedals that make it worth trouble shooting til you get it right.

Thanks Again to all the incredible thoughts and minds that are here at this forum.

Darryl Icard

[markusw]

Well Markusw, after looking over your schematic I had to make to changes to my layout of my Mistress. I had a 1N4001 on the 311 IC and the clock pot wired as a variable resistor. I changed these 1N4001 to a 1N4148 and pot wired correctly, works perfect no tick no thump just perfect Flanging. This is an incredible Flanger the long swoosh it has is great, thanks again to you Mark,Stephen, Francisco and Bernard. These are the kind of pedals that make it worth trouble shooting til you get it right.

Thanks Again to all the incredible thoughts and minds that are here at this forum.

Darryl Icard

Cool you got it working! 

Interesting findings btw.

I suppose the different wiring of the clock pot shouldn't make a huge difference provided it is set to about 50% travel. Wired like in the original the total resistance is limited to 50k (at 50% travel) regardless which side you turn it, the reistance curve being quite flat at 50%; the curve basically looks like a mirrored log pot (U shaped). Therefore, with the pot wired as variable resistor at 50% you should get exactly the same result as with the pot wired the original way at 50%.  With the pot as variable resistor you have a larger frquency range though, extended to lower frequencies.

Didn't expect that 1N4001 versus 1N4148 would make a difference. Voltage drop should be about the same.

I would highly appreciate if someone else (with more than 2 weeks of flanging experience ) could comment on these findings.

Anyway, most important thing is you got it working

Markus

[darryl]

Thanks Markusw, yes it was great to get it going. I have build plenty of boxes and this is my first Flanger. Again thanks for all the work, and by the way are you looking for more of the science behind the pedal. Let me know if you have any more ?

Darryl

[markusw]

I appreciate your appreciation!

I appreciate you appreciating my appreciation (Is this still english?)

Markus

[markusw]

Thanks Markusw, yes it was great to get it going. I have build plenty of boxes and this is my first Flanger. Again thanks for all the work, and by the way are you looking for more of the science behind the pedal. Let me know if you have any more ?

Darryl

It was my first Flanger too. So I really understand your joy

At least I try to understand whats going on in all the pedals I build, which might be the reason for the actually quite low number of built fx boxes.
I'm always very happy if somebody reveals one piece of the whole electronic knowledge puzzle to me This forum is definitely a great source. You just need plenty of time to browse through all these posts.  So most of the time it isn't me who is explaining the science behind the pedals.



Markus

[psst]

Here's the BOM, maybe you want to add it to the pdf:

Resistors
---------

2 - 10R
1 - 200R
4 - 470R
1 - 510R
1 - 1k
1 - 2k7
2 - 3k9
1 - 4k7
3 - 5k6
1 - 6k2
2 - 8k2
3 - 10k
1 - 12k
1 - 13k
1 - 24k
1 - 27k
1 - 30k
1 - 33k
2 - 39k
1 - 47k
1 - 62k
1 - 82k
2 - 100k
2 - 200k
2 - 1M
1 - 1M2

Capacitors
-------------

1 - 47p
1 - 1n
1 - 2n2
1 - 3n3
1 - 6n8
1 - 15n
1 - 33n
3 - 47n
1 - 68n
1 - 100n
1 - 220n

Polars
-----------

1 - 1u (tantalo)
1 - 1u
1 - 5u
1 - 10u
2 - 33u (tantalo)
1 - 100u
1 - 220u

Diodes
------

1 - 1N961B
2 - 1N4001
1 - 1N4148

Transistors
------------

1 - 2N5087

Integ
----------

1 - CD4013 (14)
1 - SAD1024 (16)
1 - LM311 (
1 - 4558 (
1 - LM324 (14)

Trimmers
--------

1 - 10k
2 - 100k

[markusw]

Here's the BOM, maybe you want to add it to the pdf:

Thanks! Will add it this evening! I was too lazy to do it

Markus

[psst]

Thanks!

No, thanks to you!

BTW, what about the volume drop when true-bypass? Did you check that?

[markusw]

Here's the BOM, maybe you want to add it to the pdf:

Added. File updated

BTW, what about the volume drop when true-bypass? Did you check that?

I checked right now, and although it's not massive it's clearly audible. So adding a tiny post-gain-stage PCB will be necessary for TBP.

Markus

[markusw]

suppose the different wiring of the clock pot shouldn't make a huge difference provided it is set to about 50% travel. Wired like in the original the total resistance is limited to 50k (at 50% travel) regardless which side you turn it, the reistance curve being quite flat at 50%; the curve basically looks like a mirrored log pot (U shaped).
Therefore, with the pot wired as variable resistor at 50% you should get exactly the same result as with the pot wired the original way at 50%. 

Sorry for that crap 

Two 50k in parallel are 25K. Thus, to get the same VCO freq with the clock trim wired the original way at 50% you obviously need to turn the pot wired as variable resistor to about 25%.

With the pot as variable resistor you have a larger frquency range though, extended to lower frequencies.

Still true IMHO

Might be interesting for bass. Will try on weekend.

Markus

[markusw]

OK, right now I checked the VCO frequency w/o the clock trim jumper. With the trim wired as variable resitor at 50% travel the VCO goes down to about 17kHz, at 100% travel down to about 9kHz. Basically, I like the sound best with the trim set to about 25% travel which equals 50% travel with the trim wired like in the original. Anyway it for sure doesn't hurt to leave the jumper off since it's quite interesting to see/hear what happens.

At higher trim pot resistance than 50K (i.e. lower VCO frequencies than 17kHz) the sound comes somehow distorted. Maybe somebody could explain why ? 

Markus

[markusw]

Added a note on the 2k7 resistor at the battery pad to the project file.

Markus