Hi Rob, great video and it makes perfect sense among a row of pedals with only a 9v mains power supply. I was wondering if the 100 ohm resistor is necessary for other types of pedals. I was planning to install the MT3608 into a home built univibe pedal that requires 24 volts. Do you think I still need the 100 ohm resistor?
So I rigged up a MT3608 inline of a standard 9v cable from the power supply, tuned it up to 18v, it works but there is a ton of hiss. Any thoughts why? I also had to turn the trim a fair bit before it moved and was VERY sensitive on the screw. Also noticed the voltage slowly dropping when I turned the power supply off not staying stable 18v until it reached threashold...
Hey Rob, love your videos. You have a seemingly deep understanding with many gems of wisdom along the way. Love it! I'm looking to try a bartolini ntmb I have at 18v but don't have much room in the control cavity. I was thinking about using one of the step up boards you mention. On hand I have one using the XL6009, from the little research i've done it seems the losses in the step up board are more than the operating current of the preamp itself, thereby reducing battery life by a large margin, more than 50%? The ntmb uses 750uA in 9v operation and 1mA in 18v operation according to Bartolini's wiring pdf. Would the mt3608 be more efficient? By a decent amount? Perhaps as you mention in the video I should build a charge pump but the mention of possible noise interference made me wary.... Cheers Leigh
Thanks for the great video Rob! I went and bought a couple of MT3608's from eBay here in AUS to have a bit of fun. I just want to see how my Fulltone OCD sounds at 18v. I assume after setting the trim to 18v and checking the polarity I'm good to go?
I also actually used to have that exact wah, sold it as i didnt like the sound. Later found out the 18v output i was running it from on my Sherlock amps PS was unregulated (for whatever reason). It measures 21v and ran on that for 15yrs mind you haha. Anyhow i wondered why my OCD was humming and not making guitar signal. Thanks again!
The simplest, cheapest, and smartest way of dealing with an 18 volt pedal is to get an additional 18 volt adapter for that pedal. $10 to $20 bucks. Absolute overkill to redesign the entire power supply circuit. You've literally built a guy a watch when all they are asking is what time it is.
