A/DA Flanger PCB

vtl5c3 · Posted: Thu Aug 23, 2007 9:57 am Post subject:

How hard would it be to hack in voltage control over regen/feedback? Maybe put an insert point between P1 and T2 and put a VCA between the two?

R.

BTW, just ordered one of your boards.

mono-poly · Posted: Thu Aug 23, 2007 12:51 pm Post subject:

Wouldn't a vactrol do the job?

moosapotamus · Joined: May 11, 2007 Posts: 113 Location: New Hampshire USA

The order has been submitted. Should just be a couple of weeks until I receive them.
I was able to order some extras. So, for anyone who missed the deadline... boards are still available. Cool

Thanks!
~ Charlie

omarvolta · Joined: Sep 13, 2007 Posts: 2 Location: madison WI, USA.

wow it's all i can say. i found your site sir and all i could do was drool at those ada flanger boards. hopefully i'm not to late to order one. if so then count me for the next run(if there is one), but if there's one available(crossing my fingers) let me know and tomorrow evening i can send you the payment.

peace. - ilyich.

moosapotamus · Joined: May 11, 2007 Posts: 113 Location: New Hampshire USA

Yes, I ordered some extras and still have some available.

omarvolta - go ahead and send payment and I'll send you one.

I just received notice from the fabricator that the boards have been shipped to me. So, I'm hoping to receive them tomorrow, get them all packed up over the weekend and sent out first thing next week.

If anyone else still wants, before sending any payment, please ask to be sure I still have some available.

Thanks!
~ Charlie

omarvolta · Joined: Sep 13, 2007 Posts: 2 Location: madison WI, USA.

YES!!!!!!!! so does that mean you're saving one for me?? because as I said i can only send you the payment tomorrow evening. i can possibly do it later today, but tomorrow it's for sure.

moosapotamus · Joined: May 11, 2007 Posts: 113 Location: New Hampshire USA

Yes. You're all set.

Thanks
~ Charlie

tomcat · Joined: Oct 14, 2005 Posts: 141 Location: earth

Found a lonely sad1024.

Sooo, one more pcb left?

vtl5c3 · Posted: Sat Sep 22, 2007 3:04 pm Post subject:

Got my board today. Looks very nice!

goodrevdoc · Posted: Sun Sep 23, 2007 11:36 am Post subject:

Received my board yesterday, great job and thanks!
-justin

moosapotamus · Joined: May 11, 2007 Posts: 113 Location: New Hampshire USA

Thanks, guys. Cool

Yes. Still have some extra boards available.

~ Charlie

germaniac · Posted: Fri Sep 28, 2007 1:27 pm Post subject:

Hey Charlie,

What's the status on the flanger PCBs? I sent payment 8/15/07, but still waiting for mine. . . .

Regards,
Joe

mono-poly · Posted: Fri Sep 28, 2007 4:13 pm Post subject:

received mine to
thx!

softfin · Posted: Sat Sep 29, 2007 3:54 am Post subject:

Got mine yesterday! Thanks Charlie!

moosapotamus · Joined: May 11, 2007 Posts: 113 Location: New Hampshire USA

germaniac · Posted: Wed Oct 03, 2007 9:13 pm Post subject:

Hey Charlie,

Got my PCB today. Cool

Really nice work, top notch! Thanks!

Regards,
Joe

StephenGiles · Joined: Apr 17, 2006 Posts: 507 Location: England

I'm not waiting for boards but we have a 2 day postal strike here in the UK followed by another on Monday Evil or Very Mad

moosapotamus · Joined: May 11, 2007 Posts: 113 Location: New Hampshire USA

Still have some PCBs available - PM me if interested.

Thanks
~ Charlie

funkyfarm · Posted: Wed Oct 24, 2007 3:16 am Post subject:

StephenGiles · Joined: Apr 17, 2006 Posts: 507 Location: England

What is the advantage of VC over regen/feedback?

funkyfarm · Posted: Fri Nov 02, 2007 12:48 am Post subject:

funkyfarm · Posted: Sat Nov 03, 2007 5:02 am Post subject:

Does anybody understand the Bounce mod ?
It takes the signal form RANGE pot cursor...
I guess full ccw, nothing much different, but when Bounce pot is turned cw, modulation/sweep signal passes trough the 324 array...

"bounce" means it enhances the modulation signal ?

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StephenGiles · Joined: Apr 17, 2006 Posts: 507 Location: England

I can't find my manual right now but I found this reference from the manual:

When the BOUNCE control (a knob on the front) is full clockwise, only changes in the control signal (0 - 5 VDC, or what Steve refers to as CV in his post) affect the flanging while at full CCW only the control signal itself affects it. The control signals can come from the oscillator, the envelope follower, a manual adjust on the front panel, and a socket called remote (for a footpedal or other CV source). Unlike the Phaser, the FL-201 allows for combinations of the these four sources - for example the oscillator can be sweeping along at a given rate AND the envelope follower can add transients or longer releases.

At one extreme of the knob, the user brings a signal differentiator, pulse shaper, and an active filter on-line. At the other extreme a VCO for setting the low frequency limit and a full-wave rectifier are in the path. The knob allows for mixing between these two extremes.

They say, "(a)s this control is rotated clockwise, the flanging control signal is progressively substituted for by a damped sine wave initiated by changes in the control signal. This damped signal swings the flanging back and forth by a diminishing amount for each swing, simulating the "hunting" effect created by an AC or servo motor changing speed."

How the electrons flow is described in great detail in the section called "Circuit Description" But without the schematic in front of you, the IC references won't make any sense I'll quote what's relevant. Let me know if you are bored.

It seems IC11 is the differentiator and its output is dependent upon the rate of change of the input. They say, "(t)hus, when the oscillator changes from positive slope to negative slope," (crossing zero, right?), "the output of IC11 changes polarity." It says later, "The effect of all this circuitry is to generate a damped sinusoidal oscillation at a low frequency when the control voltage changes direction" (rising or falling, essentially anything but zero).

Then it says, "(t)his corresponds in classical flanging to removing the load from the reel motor. The damped oscillation in flanging is caused by the mechanical inertia of the motor - when it reaches its proper speed, it cannot stop changing speed instantly, and thus tends to overshoot, causing it to slow down, etc."

funkyfarm · Posted: Mon Nov 19, 2007 9:51 am Post subject:

Waouh !!

I was a little bit impressed, and then I'm somewhat reassured as this Bounce function is on the Instant Flanger as on the JH Tide Storm Flanger Wink

http://home.debitel.net/user/jhaible/jh_storm_tide_flanger.html

"5. Bounce

The summed control voltage (Manual, Pedal, LFO, Envelope follower) is fed into a sub audio BPF, then into a nonlinear amplifier with positive feedback (not a schmitt trigger, but similar), and then filtered by a second BPF. A variable portion of this is mixed to the straight CV to control the BBD's clock frequency. The effect is most prominent on single-shot, non-periodic CV changes, such as a fast single Manual of Pedal sweep. The single sweep is followed by smooth "echoes" that go in either direction (faster clock and slower clock). This is to emulate the "bouncing" tape speed of reel-to-reel tape machines when the friction from a thump against the reel is suddenly released.
"

moosapotamus · Joined: May 11, 2007 Posts: 113 Location: New Hampshire USA

FYI - Looks like I am getting another batch of these PCBs fabbed up.

Documentation and stuff is all here...
http://moosapotamus.net/IDEAS/ADAflanger/ADAflanger.html

Cost with shipping included for each PCB will be...

In the continental USA:
$27 each if buying up to nine (9) PCBs
$23 each if buying ten (10) or more PCBs.

Anywhere else in the world:
$31 each if buying up to nine (9) PCBs
$27 each if buying ten (10) or more PCBs.

All payments must be made in US Dollars in advance via PayPal to my PayPal ID - cbarth AT welchs DOT com.

Please type the following in the PayPal subject line,,,
Flanger PCB [your forum name] [number of PCB's you are paying for].
For example... Flanger PCB moosapotamus 2

Please do not forget to include your name and shipping address.

I will keep this open for at least a week or two to make sure everyone who wants to can get in on the order.

Like I've done in the past, I will also try to order a few extra in case some folks miss this announcement.

Once all payments are received, the order will take ~10 days for production + 2 days shipping to me.

I will send the boards out to everyone via USPS as soon as I receive them.

This is for ExpressPCB's production service (2-sided, plated thru holes, with silkscreen and solder mask included).

Thanks!
~ Charlie