Am I in way over my head here? Schematic

[VPIF]

Hi everybody! (The voice of Dr. Nick Riviera could possibly be appropriate here).

I am trying to design a layout to have fabricated in OSHPark or similar.

It's a transistor buffer into a electronic switching circuit (one of R.G. Keen's, IIRC) into a Muff. See the slightly messy, attached schematic.

I have a breadbord in the mail, and I intend to test the switching circuit on this. My question is really if this is something i can proseed with, or if the schematic has obvious flaws. I feel like I'm somewhat out of my depth with this one.

Appreciate any thoughts, views and critisizm. Thanks.

[aron]

I would say that is way too complicated if you are new to this, BUT everyone is different and I suppose as long as you take it slow it is possible for sure. Take it in small sections at a time.

[Keppy]

IC1B has several incorrect connections. For one, you have 9v connected straight to ground, shorting your power supply. Pins 8-11 should be grounded, pins 12-13 left unconnected. Since pins 12-13 are always opposites, one of them will always try to go high, and will dump gobs of current to ground trying to do that if connected as shown.

I haven't looked up the 4053 logic diagram to check that aspect, but your biasing in that section looks okay. It does have some extra components, though.

If you connect R33 to vref instead of ground, then you don't need R40, R41 or C22.
Likewise, you can remove R1 and C24.
Connect POT3 to vref instead of ground and you can remove C25 and R46.

It looks like you got the idea of biasing all the ins and outs of the 4053 to vref, but missed some of the more efficient ways to do it.

There's also a 9v symbol above the 4053 that connects to nothing.

Those are the things I spotted, though I didn't reference RG's article, a Big Muff schematic, or the 4053 datasheet, so there could easily be things I missed. I also know nothing about the fabrication process and how to get from an Eagle schematic to a file that a fabricator can use, so I can't help there.

Other than the IC1B thing, I don't see why this shouldn't work, even without the other changes I mentioned. Good luck!

[VPIF]

Thanks for the feedback.

I am not a total beginner, but my knowledge about electronic switching is shallow, at best.

I have made a few of the buffers. They are straight up clones, and will work. I have made a few Muffs, and have had a working PCB fabricated for the Muff. I spotted a missing ground connection by the power filtering caps on the Muff, but other than that the schematic should be fine. But I have never fused several different circuits like this before, and I try to avoid any pitfalls.

I would like to explore electronic switching, but it seems as though I may have overcomplicated it a bit. Guess I will have to try to sort it out on the breadboard, once it arrives.

Found the link for the electronic switching article, btw: http://www.geofex.com/article_folders/cd4053/cd4053.htm

[amptramp]

C14 and C15 should be connected to ground.

If C5 and C8 are smaller that C6 and C9, this should be OK.  We need values to see if this is going to work properly.

[CodeMonk]

Its often said, that if you want to be a better guitar player, play with people that are better than you.
And I've found that one of the ways to improve your skills is to occasionally tackle a project that's a little bit "over your head".
But don't try to go to far over your head right away.

How far over your head this one may be I couldn't say without knowing what you have built before.

[StephenGiles]

We are all different  I started in 1978 with PE fuzz boxes, 1980 - EH Microsynth, 1981 EH Rack Guitar Synth all on veroboard so there you go!

[VPIF]

Thanks.

I have buildt a working buffer on stripboard, and have a few fabbed Muff PCBs, so I have decided to try to breadbord the switching circuit (after correcting the schematic) and hook them all together.

I will spill my bitter tears over this great forum if I'm unable to figure it out ;-)