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LOW RIDER - 2 OCTDOWN PRESENTS A SLIGHT DELAY

Started by sergiodam, January 05, 2013, 05:54:48 PM

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sergiodam

Dear friends. Firstly, I regret because I don't speak (or write) English very well ... 
I've built a  LowRider. It works very well, but has 2 problems (not too big, but are problems, at least for me...). The OCT-UP is not very perceptible, and the 2-OCT-DOWN presents a slight delay in the bass notes (like the octave-note sounds a little bit before the original-note).  They do not sound together. 
About the octave-up, the best I got was a fuzz. I tried the MOD, but it didn't work.  Also I tried to regulate by trimpot, but nothing changes so much. In the end I preferred to leave the C10 and C12 off and leave the fuzz in peace.
About the substitutions done, all of them were according to the instructions. I used 2N5458 transistors instead of the original 2SK30 (I used sockets, so I could test many other transistors, but really the best result was 5458 – I didn't find the 5457 in Rio de Janeiro). As I also didn't find the CD4013BCN, I used CD4013. The capacitors were ceramics (lowers values), polyester (little blues boxes) and electrolytic for higher values, when marked in the layout.  For the three 1uF caps without polarity I used  electrolytic NP (is it a problem?) ::)
The steps that I've taken to try to resolve were double check the components values, wiring, soldering, footswitch and jacks wiring, orientation of components, ICs and potentiometers substitution by others of same values. How it was unsuccessful,  I decide ask in this forum about others experiences.
Are these typical characteristics for the Low Rider or I did some mistake? ???

madbean

Did you see this additional mod for the upper octave?
http://www.madbeanpedals.com/forum/index.php?topic=7497.0

On the delay--how much of a delay are we talking (roughly) in milliseconds? As much as a slapback type sound, or more?


sergiodam

Quote from: madbean on January 05, 2013, 06:26:20 PM
Did you see this additional mod for the upper octave?
http://www.madbeanpedals.com/forum/index.php?topic=7497.0

On the delay--how much of a delay are we talking (roughly) in milliseconds? As much as a slapback type sound, or more?


No, only now I saw the additional Mod. I'll try it. :)
The delay time (in milliseconds!) I can't tell you exactly. Is about a quarter of a second (250 ms) in average (as more bass the note - like an open E, for example, as bigger is the gap...). It happens more frequently in basses notes. Almost never in middle or high notes.

Thanks

sergiodam

Quote from: sergiodam on January 05, 2013, 07:12:49 PM
Quote from: madbean on January 05, 2013, 06:26:20 PM
Did you see this additional mod for the upper octave?
http://www.madbeanpedals.com/forum/index.php?topic=7497.0

On the delay--how much of a delay are we talking (roughly) in milliseconds? As much as a slapback type sound, or more?


No, only now I saw the additional Mod. I'll try it. :)


I'd like to report the experience with the mod for the upper octave. The change of D1-D2 to 1N34, in fact, was great. I noticed that there is, now, a little more gain. What do you think about change the OCTUP potenciometer from 100kB to 250Kb? I didn't test back the original values of C10 and C12 yet.