MAESTRO Filter Sample Hold CLONE problem

Forum dedicated to helping people debug and troubleshoot non-functional pedals or builds. Please use an clear and informative title, indicating circuit and basic problem. Don't forget to mark the issue as fixed if this is the case.
Post Reply
User avatar
mig81
Information
Posts: 12
Joined: 19 Mar 2016, 07:26

Post by mig81 »

Hi Guys, I'm gonna be crazy!! Please help!!
I built a MAESTRO Filter Sample Hold with modern improvements like the layout of GENERAL GUITAR GADJED said.

http://www.generalguitargadgets.com/pdf/ggg_fsh_lo.pdf

Well I did everything like the layout and when I switch on the pedal in true bypass mode it makes an hiss under the guitar and if I switch ON the effect it makes noise.
If I switch on Filter or Sample hold the sound changes but it's noise. Even the pots affect the noise when turned.

In the board the electricity seems to be right: 8volt when it must be 8volt.
I rechecked everything. I may bought some wrong components??
I bought:
Q1: 2N5088
Q2 Q5 Q6: 2N5457
Q3: 2N3906
Q4: 2N3904
Q7: 2N3906

IC: 3080
IC: UA741CN (instead LM741 ST)
MAXIM: MAX 1044

Maybe it's a stupid problem and I cant find it because I'm not a technican.

Sorry for my english. hope someone helps me...
I'll send a picture and a video of the problem soon...
Michele from Italy

User avatar
mig81
Information
Posts: 12
Joined: 19 Mar 2016, 07:26

Post by mig81 »

Image

User avatar
mig81
Information
Posts: 12
Joined: 19 Mar 2016, 07:26

Post by mig81 »

VIDEO OF THE PROBLEM:
https://youtu.be/ayzik31z2xY

User avatar
mig81
Information
Posts: 12
Joined: 19 Mar 2016, 07:26

Post by mig81 »

Image

Image

User avatar
mig81
Information
Posts: 12
Joined: 19 Mar 2016, 07:26

Post by mig81 »

It should be a wrong ic or transistor i bought...I made an error with a component...I think...

User avatar
idy
Breadboard Brother
Information
Posts: 126
Joined: 14 Dec 2011, 04:41
Completed builds: FFs, Octavias, TBMKIIIs, Buzzarounds/alikes, Axis Fuzz', CS Overdriver, BMPs, Black '65s, MOSFETODs, WiiO, RAH, Klons, AC30, DLS, TSs and many variants, Small Clones, UniVibes, E. Mistress, Mutron Env Filter, Ross/Dynacomps,, EA Trems, TremLunes, Katana Boosters, BYOC Tri Boosters, other boosters and buffers, PT2399 delays, SKRM based delays, Belton Brick Reverbs, 3band parametric EQ,
Location: Idyllwild, CA
Has thanked: 27 times
Been thanked: 31 times

Post by idy »

Give the voltages on the chips and transistors.
Your solder looks "too neat" it doesn't appear to cover the copper pads. One loose joint and no go...

Read the other threads about this circuit/PCB.

Double check the pinout of the transistors and schematic and the board (does the silkscreen tell the truth?)

User avatar
mig81
Information
Posts: 12
Joined: 19 Mar 2016, 07:26

Post by mig81 »

Ok Thanks a lot Idy!
I'll check again everything and I'll post here the voltages of the ICs and Transistors.
The IC 3080 I used is an CA 3080 EV is it correct?
I have soldered even a micro LM741 (for computering I think) with the same bad result. Is the UA741CN correct?

Could someone tell me exactly which transistor I should searching on internet for this circuit?

I think I bought a wrong component because I can here a sort of filter effect in the background but with many noisy….

User avatar
mig81
Information
Posts: 12
Joined: 19 Mar 2016, 07:26

Post by mig81 »

…I forgot….I found a little error in the wiring layout….
Here the correct layout. General Guitar Gadget will updates the site soon…

Image

User avatar
idy
Breadboard Brother
Information
Posts: 126
Joined: 14 Dec 2011, 04:41
Completed builds: FFs, Octavias, TBMKIIIs, Buzzarounds/alikes, Axis Fuzz', CS Overdriver, BMPs, Black '65s, MOSFETODs, WiiO, RAH, Klons, AC30, DLS, TSs and many variants, Small Clones, UniVibes, E. Mistress, Mutron Env Filter, Ross/Dynacomps,, EA Trems, TremLunes, Katana Boosters, BYOC Tri Boosters, other boosters and buffers, PT2399 delays, SKRM based delays, Belton Brick Reverbs, 3band parametric EQ,
Location: Idyllwild, CA
Has thanked: 27 times
Been thanked: 31 times

Post by idy »

I think you mean CA3080EZ, that should be OK.

User avatar
idy
Breadboard Brother
Information
Posts: 126
Joined: 14 Dec 2011, 04:41
Completed builds: FFs, Octavias, TBMKIIIs, Buzzarounds/alikes, Axis Fuzz', CS Overdriver, BMPs, Black '65s, MOSFETODs, WiiO, RAH, Klons, AC30, DLS, TSs and many variants, Small Clones, UniVibes, E. Mistress, Mutron Env Filter, Ross/Dynacomps,, EA Trems, TremLunes, Katana Boosters, BYOC Tri Boosters, other boosters and buffers, PT2399 delays, SKRM based delays, Belton Brick Reverbs, 3band parametric EQ,
Location: Idyllwild, CA
Has thanked: 27 times
Been thanked: 31 times

Post by idy »

The video doesn't show much. You strum a little, click it on, play with the switches and knobs but don't play anymore. We need to hear it with the F/SH in both positions and the other knobs "up" and "down." And with you playing or some kind of signal.

We're not sure you even have a problem yet.

Have you read about the adjustment of the trimmers? If they are not rightm no filter, no SH.

Lots of others have done this before you. Most of us have had a hard time with this once or twice....

Try reading about the tonepad layout and the madbean "sharkfin." Different layouts, same effect. I think the tonepad was the one with the FET's reversed....

User avatar
mig81
Information
Posts: 12
Joined: 19 Mar 2016, 07:26

Post by mig81 »

Maybe, this project is a new project? because an year ago the project on GGG was different. It was a project exactly like the original (18volt). Maybe nobody have done this new project yet? don't know...I'll check it again but next week I'll have all the component to do the exactly clone of the Maestro pedal (18 volt). I think I'll print and iron an other PCB and I'll do for that one!!

User avatar
idy
Breadboard Brother
Information
Posts: 126
Joined: 14 Dec 2011, 04:41
Completed builds: FFs, Octavias, TBMKIIIs, Buzzarounds/alikes, Axis Fuzz', CS Overdriver, BMPs, Black '65s, MOSFETODs, WiiO, RAH, Klons, AC30, DLS, TSs and many variants, Small Clones, UniVibes, E. Mistress, Mutron Env Filter, Ross/Dynacomps,, EA Trems, TremLunes, Katana Boosters, BYOC Tri Boosters, other boosters and buffers, PT2399 delays, SKRM based delays, Belton Brick Reverbs, 3band parametric EQ,
Location: Idyllwild, CA
Has thanked: 27 times
Been thanked: 31 times

Post by idy »

GGG posted "original" and "modern improvements" versions, latest update may 2015.
Is this your first project?
Why do you think the original would be better?

User avatar
deltafred
Opamp Operator
Information
Posts: 1654
Joined: 06 Apr 2010, 16:16
Location: England
Has thanked: 813 times
Been thanked: 306 times

Post by deltafred »

Two things.

1. I think you have etched the PCB "mirror image" (I did exactly the same the first time I etched one). The view that mig81 posted is a "component side view", you have etched your copper side to look like that. The writing on the copper side "FSH" should read the correct way round, not reversed as yours does.

2. I have never seen components soldered like that before. something is wrong with your soldering technique, You need a smooth cone of solder that connects the component leads to the copper. Yours looks to only be soldered to the leads. Try more solder and keep the iron on the joint until you see it flow.

Have look at a few soldering guides, here is one I found http://www.build-electronic-circuits.com/how-to-solder/
Politics is the art of so plucking the goose as to obtain the most feathers with the least squawking. - R.G. 2011
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012

User avatar
mig81
Information
Posts: 12
Joined: 19 Mar 2016, 07:26

Post by mig81 »

Hey my solders are well done..I posted a photo of the unsoldered board. I'll post a photo of the solsered board but all the connections are good.believe me! I already built some pedals and 3 tube guitar amps in 10 years. I' m not a technichan anyway.

I think the 18volt should be better because it's the original project...even Mu-tron made an advertisement...i'll post it

thanks guys I'll let you know if i will filter and sample hold something!!

User avatar
mig81
Information
Posts: 12
Joined: 19 Mar 2016, 07:26

Post by mig81 »

I flipped the image of the unsoldered board to read it better respect the component side.

I founded the Mu-tron advertisement of 1976!! I think they said something good after all the 9volt battery Era! :)

Image

User avatar
mig81
Information
Posts: 12
Joined: 19 Mar 2016, 07:26

Post by mig81 »

Maestro had 2 9volts batteries and not an externel connetion anyway.....and Mu-tron circuits were freehand drawn anyway.

User avatar
mig81
Information
Posts: 12
Joined: 19 Mar 2016, 07:26

Post by mig81 »

here the soldered side. Not wonderfull but not cold soldering too... I tried to clean with ACETONE.....

Image

User avatar
deltafred
Opamp Operator
Information
Posts: 1654
Joined: 06 Apr 2010, 16:16
Location: England
Has thanked: 813 times
Been thanked: 306 times

Post by deltafred »

mig81 wrote:I flipped the image of the unsoldered board to read it better respect the component side.
Doh - I thought that was your soldered board. No wonder I thought you had a mirror image and strange soldering.
:slap: :roll: :oops:
Politics is the art of so plucking the goose as to obtain the most feathers with the least squawking. - R.G. 2011
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012

Post Reply