Bajaman,
if you don't plan to sell these boards yourself, they should be available via madbean, 1776 or Aion! Or maybe uk-electronic.de in germany?
Any more news, bajaman? Still waiting on those boards to come in?
How brutal is it? 8D
bajaman wrote:I just ran some more sims - this time to investigate the clipping behaviour in an interactive simulation.
Surprisingly the first clip occurs in IC2b the third gain stage and AFTER the stage with the zeners in the feedback loop AND AFTER the back to back 1N4148 diodes - in fact removing the zeners and the 1N4148s from the simulation made no change at all to the output waveform.![]()
Not sure exactly when or if these diodes have any effect on the clipping behaviour of this pedal but the primary clip appears to be within that third TL072 gain stage![]()
Okay I was inputting an 8mV sine wave signal at 1kHz when I measured the onset of clipping in IC2b.
I increased this signal level up to 130mV before i was able to detect any appreciable clipping behaviour BEFORE IC2b indicating that the diodes were now conducting - that is over 16 times the signal level which makes me wonder if the pedal would sound any different without the diodes in place at all![]()
bajaman wrote:Thanks for the clarification on the noise gate bmxguitarsbmx![]()
and thanks for the tube amp explanation Groovenut - you are 100% here - most folks do not realize that it is the driver or phase inverter stage that overloads and clips first in 90% of all tube guitar amplifiers. The vain idea that someone can purchase a boost pedal to drive the front end of their amplifier into overload is of course total nonsense because the driver stage will saturate WELL before this could EVER happen
What I find interesting with this Diezel VH4 pedal design is the tone stack is AFTER the clipping 3rd stage whereas in a tube amplifier it is always BEFORE - and it is the TL072 clipping which is then modified by the following treble, mid, bass, presence and deep controls that defines the sound (plus the high cut filter tagged on the guitar amp output socket to roll off the fizz! )
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bajaman
Maybe non-master volume designs
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