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May one replace a 50pf cerm cap with a 51pf?. The only 50pf I can find are 1KV and physically wont fit in my build.
TIA 

Thank You for your fast response.

Rockhorst:
I am assuming that the Clean Fusion is yours.
To answer your question, the "parent board" I'm using is the Bass Fuss. It doesn't have a power supply, just a 9v tap, which I was just going to add the 1n4001 polarity protection to, so I guess I'll tap into the fusion's PS.
I (attempt to) build from schematics, and etch my own PCB's.
What is the difference between "jump" and "omit" in the BOM? Does "jump" mean replace the resistor with a wire, and "omit" mean leave the connection open?
Also, in the PS section, there is two 9v+ taps before the connection to the 9v+ pad. That confuses me.
I would like to thank you in advance for your time and expertise in answering my questions.

Thx madbean. I usually buy from mouser, but sometimes wondered at the different sizes for same resistance and wattage 

As far as audio goes, what is the difference between carbon film and metal film. I have noticed that some carbon films are smaller than metal at the same wattage, and that the size of carbons differ. I am trying to squeeze as many components in as small a space as I can so size is a factor. Also, what are the good companies?  I mean like who is cheap, who is middle of the road, and who is the premo?
TIA

Thanks for all the help guys

After rereading the post, I retract my FM's R7 question, as Max has answered it. Sorry, early morning

Thanks for the all the help.
mjg...once I get this circuit worked out on my breadboard, I will build the one you suggest on a different breadboard to do a side by side comparison to see which I like better.
My original question was answered, but like in so many other things in life, the answer just raised more questions.
Like, what is the difference between the PS I posted, and FuzzMonkey's? Is one superior to the other, or just two different ways of doing the same thing, or maybe its the old everything is a trade off thing?
I see the difference in the components.
D3 in FM's is providing the polarity protection, I see that. Why is C4 in mine eliminated, and what was it's purpose in the first place?
R7 in FM's added, and the matching values of my R7 and R8, and his R5 and R6 different...Is it because the two are supplying different secondary voltages?
Would simply adding a 1N4001 to my snippet add the wanted protection?
Am I over thinking this? Are the questions I'm asking show I'm still too far over my head in all this?
TIA

Hey Guys, I've got a question about the power supply section of a circuit. Here is the whole schematic:



and the section in question:



I realize that this section is providing two different voltages. Is it also providing polarity protection? And if so, which components are doing that? I've seen it done with a diode before so I'm wondering.
Knowledge for knowledge's sake.
TIA   

THX EBK

Many schematics show non-polarized caps, but do not tell which kind to use. Consider this Schematic;



Which of the non-polarized caps are which? What is the criteria for the selection?
TIA

mjg. thanks for the input. I was hoping this would work. I play Bass, and try to build for that, but when I asked my guitarist to try my pedal, he really liked the blend. I don't think the SMD thing would work for me, heck, I have enough of a hard with through hole  

Thank you cooder. Do you know what the difference is between GRD and GRD(T)?

I'm having a hard time getting the transistors (2N5457) used in the blending portion of my pedal, so I spent most the afternoon looking for an alternative circuit. I believe I may have found it, but it doesn't name the IC.



I would guess a TL072, but I'm wouldn't know.
I also tried to get a schematic of S. MacCellen's B Blender, but I closest I could get was a PCB layout with no values. I would be willing to try either one.
TIA
 

Hey Gang. Thanks for all the help on the last question. As promised, I did my homework on the CD4049UBE, and learned that there are 6 hex inverters inside, each with an A and a Q pin. I totally get that.
My confusion lies in the fact that the four not connected to the input signal in the WHRL are all connected to +v on the "A" side with their "Q" side not connected. The SD has the four "A" to GRD. I have to believe it doesn't matter as I'm sure that both gentlemen have successfully built these pedals.
So, for Knowledge For Knowledge's Sake; What's the difference, and why are they even connected at all? I don't see what job they're doing. My best guess would be something wouldn't be happy if they were just left unconnected completely.
TIA