McMeat filter

[BRingoC]

The McMeat schematic has two filter settings, by using a 470n and I think a 22n, the Meatball has four filter caps, does anyone know what the other two values are?

[Gripp]

I think you're maybe confusing the filters on the envelope follower subsection, making it be either in full or half trigger mode, with the actual four filter ranges.
The half/full trigger mode caps are 470 and 22n (C5 and C6). They only determine the response of the envelope follower subsection by filtering it's input.

The four filter frequency ranges are set by caps C9-C14.

Here's the link to the project file.
http://home.planet.nl/~remke063/mcmeat.pdf

Best!
Pelle G

[BRingoC]

This is a bit convoluted, but the Joep schematic identifies the switches differently from the original description, going from the switch on the top right, the Joep schem lists this as Bandwidth, while the Meatball lists this as Filter frequency ranges (this is the discrepency, with 2 on the Joep, and 4 on the Meatball)  then top left switch, Sweep for Joep, Trigger for Meatball. bottom left is Range on Joep, Bandwidth for Meatball.  and bottom right Mode for Joep, Hi/Lo Bandpass filter mode for Meatball.  I am referring to is listed as Sw1-Bandwidth on the McMeat schematic,  the original unit should have four settings here, the McMeat has two.  Any idea as to what those missing values would be.  In addition the original has the option for a static/ no-sweep setting, which the McMeat is not able to do, would this be accomplished by detaching Sw2c?

[moosapotamus]

I am referring to is listed as Sw1-Bandwidth on the McMeat schematic,  the original unit should have four settings here, the McMeat has two. Any idea as to what those missing values would be.

There are no missing values in the McMeat scheme. Regardless of where the switches are mounted on the different enclosures, the bandwidth switch (SW1) on the original AND on the McMeat has three settings... full (470n), half (22n), none (none).

In addition the original has the option for a static/ no-sweep setting, which the McMeat is not able to do, would this be accomplished by detaching Sw2c?

No. The McMeat will already do static filter. Set the bandwidth switch (SW1) to 'none'.

~ Charlie

[Gripp]

EDIT: Just saw Charlie's post but I'll post anyway since having typed this.

Ok. I think it's a matter of semantics still. I have made a clone from Joep's work and it works exactly as per the meatball manual.
The only thing is that the switches aren't labelled in lovetone speak in Joep's schem. The switches in the meatball manual actually don't have names, only divided as belonging to the trigger side or the filter side .

It's like this:

Switch SW1 (called bandwidth) in the schem is the "ON FULL 1/2 "switch on a meatball.
This selects the 470nF or the 22nF or no connection to the envelope follower, this last setting is the static filter setting

Switch SW2 (called sweep) in the schem is the UP DOWN switch on a meatball.
This changes the sweep from going up to down by changing if the envelope follower voltage drives the diodes directly or if it is subtracting it from the 9V line.

Switch SW3 (called range) in the schem is the HI to LO switch on a meatball.
This selects different caps in the filter circuit giving different filter frequency ranges.

Switch SW4 (called mode) in the schem is the Different wiggles switch on a meatball.
This selects different taps in the filter circuit giving lowpass, bandpass or highpass behaviour.

So SW1 and SW2 belong to the trigger side and SW3 and SW4 belong to the filter side. Really clever to have them arranged like that on the front of the meatball. One side dealing with envelope detector behaviour and the other with the filter itself.

Hope that clears it up. Might make it more confusing though.

[BRingoC]

That clears it up a bit, when I originally made this, I hadn't read it that way.  However I am still confused on how to wire up the Sw3 then, I currently have it set for 3 positions, however the official site says there should be 4 filters there. is the 2n2 that is on the board supposed to be bypassed or added to the 3n3 6n8 and 15n, having the fourth setting buypass the three caps that are soldered to the switch?  Is that clear?

[Gripp]

is the 2n2 that is on the board supposed to be bypassed or added to the 3n3 6n8 and 15n, having the fourth setting buypass the three caps that are soldered to the switch?  Is that clear?

The on board 2n2's are always in and the other caps are switched in parallel in the other positions. So, yes, at the fourth setting, no connection should be made between points Sw3-A/Sw3-B  and anything else on the switch except an empty pin. Take a look at the switch wiring pics here: http://www.pisotones.com/Meatball/psst/meatball-psst.html