While I do believe that certain amps, guitars or musical projects would lead me to choose different pedals, these are my top five favorite PPCB boards that everyone should build.
1. Gravitational Reverb - This is my preferred way to verb, subtly and out of the way. It can do longer if needed with the flip of the switch and for a belton brick reverb it sounds really good. The build is fairly straight forward and the build would benefit from the experience of soldering in a brick and all the space constraints they exhibit.
2. Hydra Delay - As everyone else has stated, it just sounds really great. For a build, there is no better way to practice soldering SMD than the FV-1 chip. For 18 dollars you really make sure you don't fuck it up and drilling all of those holes to line everything up....whew....
3. Dung Beetle - As a few have mentioned and I have sang from the roof tops, this is my favorite fuzz. It can approximate Fuzz Face and Tone Bender sounds plus it can overdrive and get spitty and gated. A straight forward build with low part count.
4. Duo-Phase - I think this is a must for everyone, after you get a few builds under your belt. With the high part count, the drilling, the ldrs/led and clean wiring needed, it will raise your skill level. Plus is sounds amazing, you turn it on and it is Siamese Dream.
5. Flock Harmonizing Fuzz - This was an out of left field win for me. I was not expecting to even like this since most PLL circuits are too unruly for me but it has lived in various boards since it was built and is a bag of inspiration. For a build, it is a bit more than your standard fuzz build with the extra knobs and rotary switch but nothing all of us can't handle. Highly recommended!
BUT DAN!!! NO OVERDRIVES! NO DISTORTIONS!! NO COMPRESSORS!!!
Overdrive, Distortion and Compressors are very subjective and very much dealers choice. I personally think klones and bluesbreaker circuits are highly overrated and maybe benefit from using them with a louder Fender Blackface amp. Now, since no one asked, here are some of my go to drives using the various amps I own (mainly Marshall style)
1. Celestial Drive - It is gnarly and delicious, easy to build and is no longer made. It reminds me of a lower gain Rat.
2. Soul Vender - If you like Tone Benders and want to spend some time selecting the transistors, it is magic. Mine will be passed down like a holy grail.
3. Pandoras Box - Three knobs and two toggles and a myriad of tones. I have subbed the LM308N with OP07 and it is brash and fun.
4. Jet Drive - This is a sleeper rock box, I would have never bought it in stores but for a build it kicks ass.
5. Skylight Overdrive - This was designed to work with high gain amps but with a crunchy Marshall it sounds awesome and mine looks beautiful.
6. Golden Falk - The best Marshall in a box pedal made, I love it. Pair it with the UniCab and you have some great direct recording tones.
7. Cannon Fodder - I loved the original Wave Cannon and was thrilled to be able to build an original with the blast switch as a stomper.
8. Pharamcist - Its Revolver and Rubber Soul in a box.....
9. Chauffeur Overdrive - An insane amount of parts for an overdrive and it sounds really good.
10. Thumbsucker Compressor - A very versatile compressor and an easy build
11. Closed Circuit Booster - This thing really sounds great making all of your guitars sing. It is subtle but with lower output pick ups it works great.
Sorry for the hijack but you all know I could ramble for days....