Hotcake freq analysis and mods

[jtn191]

I was inspired by the mentioning of this post by Joe Gore to revisit frequency analysis of circuits http://freestompboxes.org/viewtopic.php?f=6&t=12118

For these tests, I ran 20 secs of pink noise through the "stock" Hotcake circuit (Gain @ 2:00, Presence @ 12:00, Level @ 1:00) to come up with a template



This can be compared to pure pink noise through the bypassed circuit



Together, Match EQ gives the response of the Hotcake circuit



Then, I exchanged the stock 0.047 uF output cap for a larger 0.47 uF cap. Mod compared to Stock




It's interesting to see the change, as it's not immediately noticeable by ear since other pedals and amps usually filter out some of those sub 50 Hz frequencies. I would like to do more tests with more caps and opamps.

Previously I analyzed the SHO, Neutrino, and Sunking using a different but equally accurate method in this thread http://www.madbeanpedals.com/forum/index.php?topic=2496.0