More geeky effects pedal shizzle

Having popped into the lab yesterday I decided to attach the Crunchie Boost to a signal generator and see what sort of waveform it produces. I used a 200 mV peak-to-peak sine wave input with frequencies of 800 Hz and 8 kHz, kept the volume potentiometer at max and the tone at its mid position. The results are fairly interesting and seem to be the sort of thing one requires of a tube overdrive/boost...

800 Hz:

8 kHz:

From left the right the graphs are Low Crunch, Mid Crunch and High Crunch. Red curve is the input, green is Low Boost, blue is Mid Boost and pink is High Boost.

So there is not quite the separation of Boost and Crunch effect that would be ideal since obviously the Boost also overdrives the tube stage leading to some clipping. However, the two controls do seem to be able to produce a wide range of sounds from warm tube boost through to nice overdrive. At low Crunch there seems to be clipping of the negative part of the cycle which is slightly annoying. Also there is still more noise than I would like but once it is in a box the latter may improve. I'm not to sure about the tone control either - there is quite a lot of low frequency attenuation and some distinct shifting of the phase evident at 800 Hz. Otherwise it's looking cool. Finally out of interest the complete circuit draws around 0.318 A.

Overall it is pretty pleasing and fairly incredible that it worked at all first time!