Menatone Pig  [traced]

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Menatone Pig  [traced]

Postby digi2t » 21 Nov 2013, 16:07

Hi all,

I had a request for a vero of the Menatone Pig. Here it is;

Image

Based on the work from turretboard.org

Let me know if/when someone verifies this sucker.

Cheers,
Dino
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Re: Menatone Pig

Postby OnTheTundra » 21 Nov 2013, 19:58

It works and sounds awesome.

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Re: Menatone Pig

Postby The Rotagilla » 06 Jul 2014, 00:36

Bumping for some questions and new info.

I had access to a Pig built this year and had a question. Turret Board's schematic shows a 22nf going from Q4's source to Lug 3 of the Gain control. In the version I have, the 22nf seems to go from the drain to Lug 3 of the Volume control while there's an added 22uf to ground from Q4's source (in parallel with R19). I may very well be wrong, so please correct me if I am. Also the following changes were noted...

C12- 500p
C13 - Omitted

R2 - 33k
R5 - 27k
R15 - 33k
R18 - 33k
R21 - 33k
R25 - 33k
R27 - 10k

100k trimmer replaced with a 22k resistor.

I like this pedal a lot. Personally I would drop the value of the Gain pot from 1M to 500k and spread the range. The Gain seems to reach max around noon and there are some great lesser gain shades to be had before noon that are easy to pass by. Hope this info helps.


Image
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Re: Menatone Pig

Postby engineelite » 11 Jul 2014, 20:29

Built this one from the layout in the original post and it sounds good. Mine barely has enough gain at max on the knob. How would I go about increasing the gain range?

All of my Q's are about 330 hfe

Thanks
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Re: Menatone Pig

Postby The Rotagilla » 12 Jul 2014, 15:30

engineelite wrote:Built this one from the layout in the original post and it sounds good. Mine barely has enough gain at max on the knob. How would I go about increasing the gain range?

All of my Q's are about 330 hfe

Thanks


Sounds like something's not right, this pedal has a ton o' gain on tap. Also, I mentioned in my previous post that the gain doesn't seem to increase in saturation much past noon but after spending more time with the pedal I realized that it does start to compress. Not a lot but it's noticeable.
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Re: Menatone Pig

Postby mmolteratx » 12 Jul 2014, 17:18

engineelite wrote:Built this one from the layout in the original post and it sounds good. Mine barely has enough gain at max on the knob. How would I go about increasing the gain range?

All of my Q's are about 330 hfe

Thanks


Wait what? Are you using FETs or BJTs?
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Re: Menatone Pig

Postby engineelite » 13 Jul 2014, 00:10

I'm using all J201's and they are all about 330hfe, which seems like it might be on the low side but that's all I got from tayda. Maybe I should order them from another supplier.

..and I've now built 2 of these and they both sound and react the exact same way. It sounds good and all knobs work correctly but it just needs a little more gain on tap.
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Re: Menatone Pig

Postby mmolteratx » 13 Jul 2014, 01:31

engineelite wrote:I'm using all J201's and they are all about 330hfe, which seems like it might be on the low side but that's all I got from tayda. Maybe I should order them from another supplier.

..and I've now built 2 of these and they both sound and react the exact same way. It sounds good and all knobs work correctly but it just needs a little more gain on tap.


You don't measure Hfe (common emitter current gain) on JFETs, it's a parameter specific to BJTs. FWIW, all of the FETs I've ordered from Tayda have been fakes and don't work correctly in any circuit that requires them.
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Re: Menatone Pig

Postby engineelite » 13 Jul 2014, 01:49

Good to know. I dunno what the 330 is that I measured then. The tayda j201's worked perfectly (matched at 200) in my wampler plexi-drive but I'll order some from small bear since I know their stuff is legit. I'll report back when I get them installed. Thanks.
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Re: Menatone Pig

Postby FiveseveN » 13 Jul 2014, 10:36

How are you measuring them?
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Re: Menatone Pig

Postby Clyngedal » 13 Jul 2014, 11:04

This is acrually my first post on this forum. As a big Ronson-fan I gotta have a Pig, so I decided to try and build one from this layout. I'm ordering parts right now :)
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Re: Menatone Pig

Postby engineelite » 14 Jul 2014, 16:32

FiveseveN wrote:How are you measuring them?


I just used a multimeter on the NPN side
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Re: Menatone Pig

Postby FiveseveN » 14 Jul 2014, 17:22

Yeah, that's not going to tell you anything meaningful: it divides collector current by base current, but for FETs the "base current" is basically zero, they are voltage-controlled devices.
PS: here's a discussion about characterising JFETS: http://stompville.co.uk/?p=112
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Re: Menatone Pig

Postby shooto » 08 Nov 2014, 19:54

I have the same gain problem...anyone find a solution?

thanks
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Re: Menatone Pig

Postby johnk » 05 Feb 2016, 00:50

I just drew up a PCB for it and can confirm that the tagboard schematic has an error. the 22n that goes to lug 3 of the gain pot on Q4 should be connected to the DRAIN and NOT the source. It has much more gain that way. this was posted earlier in the thread.

here's my verified PCB layout and a PCB that is 800dpi:
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Re: Menatone Pig

Postby johnk » 05 Feb 2016, 02:36

...and if you want still more gain, add the 22uf cap in parallel to R19.
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Re: Menatone Pig

Postby johnk » 05 Feb 2016, 06:59

The Rotagilla wrote:Bumping for some questions and new info.

I had access to a Pig built this year and had a question. Turret Board's schematic shows a 22nf going from Q4's source to Lug 3 of the Gain control. In the version I have, the 22nf seems to go from the drain to Lug 3 of the Volume control while there's an added 22uf to ground from Q4's source (in parallel with R19). I may very well be wrong, so please correct me if I am. Also the following changes were noted...

C12- 500p
C13 - Omitted

R2 - 33k
R5 - 27k
R15 - 33k
R18 - 33k
R21 - 33k
R25 - 33k
R27 - 10k


I tried these values in mine and the Jfets bias up A LOT better with them anf the circuit sounds much nicer. I din't find the need to replace R2 or R27 (the input and output resistors) but thanks for posting the info!
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Re: Menatone Pig

Postby johnk » 06 Feb 2016, 02:22

just finished boxing mine up. since it runs on 18V I added an internal charge pump and a relayed true bypass:


Image
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Re: Menatone Pig

Postby johnk » 06 Feb 2016, 06:08

update: i did find the pedal to sound a little dark so i replaced C18 (a 4n7) with a 3n3 and i like it a lot better now which is pretty much like having R27 being a 10K with the 4n7.
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Re: Menatone Pig

Postby The Rotagilla » 07 Feb 2016, 23:00

johnk wrote:just finished boxing mine up. since it runs on 18V I added an internal charge pump and a relayed true bypass:


[ Image ]


That's really sharp looking.
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