hey all, me again. i'm currently buying the components for the "Thor" pedal from run-off groove. i haven't had any problems with most of the semi-conductors but i have come across a particular op-amp that is giving me some trouble...the tl071. there are literally a dozen variations on this op amp...the 071acp, the 071acn. i am at a complete loss as to which one to choose, and the guy at store was quite knowledgable about the 071 but not about it's use in an effects pedal.

any help would be greatly appreciated, and i thank you for reading.

hey, im completely new to electronics and would like to begin building some stomp boxes and amps.

i had just finished learning to apply ohms law to resistors etc and was feeling pretty pleased with myself, so i picked up my Electronics Projects for Musicians book and had a look at some of the schematics. that was fine, i could see 'yup, that's an integrated circuit, thats a 2 nano-farad capacitor' but when i compared the schematic to the author's pcb layout they looked NOTHING alike.

i'm wondering is layout all a matter of preference, and if one blindly followed a schematic
in a linear fashion, eg: lining all the parts up and connecting them with wire as it would appear on the schematic, would i get good results? is layout really a matter of preference?

also, i notice a little plus within a circle on the schematics, i'm assuming this is the symbol for the power supply input?

thank you for reading