Recent content by aion

Correct - in this case Toshiba just arbitrarily labeled them differently than the standard, but in construction they're identical to the J201, 2N5457, etc. ...At this point someone will usually chime in and point out that this is only true most of the time, that there are technically some JFETs...

Yeah, this was a change between the 1975 version and the '76 revision. Roland dropped it to 1uF, and in some cases two 1uF in series for 0.5uF. Most of the DIY attempts have been based on the '76 schematic... it could be that reducing it further might help, and is something I would definitely...

Here's the build doc: https://aionfx.com/app/files/docs/octatron_documentation_draft.pdf Much of the info I have is compiled there between the design notes and build notes, but I do have some other source documents and notes that I'll post as well - stuff that was too in-depth for the document...

(Adapted from this thread) About four years ago I took a shot at the Roland Jet Phaser: The first prototype sounded great. I was about a week away from releasing it when I decided to build a second prototype just to be extra thorough... and with no obvious differences in the build, this one...

The absent-minded intermediate is exactly why I do all LEDs this way... beginners just follow the silkscreen and don't know about the convention, and advanced builders will take 10 seconds to do a continuity check if there is any uncertainty, but intermediates are much more likely to just insert...

Very strange, I haven't heard that from anyone before and this one's been built by hundreds of people over the past couple years. It's the same drill positions as the other Lovetones as well and I haven't gotten anything on any of those either. But yes, they do look pretty close to the edge in...

I avoid them out of habit, but I don't have a strong case for it backed by any sort of data. Almost all SMD pedals use ceramic capacitors all over the audio path. The measurable difference would be in the temperature coefficient, meaning the value isn't as stable across different environmental...

All correct - they work better in parallel, with each type of capacitor offsetting the weaknesses of the other. But it doesn't need to be exactly 470n by any means.

They have definitely risen in price on Mouser in the past few years, but I recently saw Tayda is carrying them now for 0.49 each and they have a pretty good stock at the moment, if that helps! https://www.taydaelectronics.com/wima-mks2-1uf-50v-10-polyester-film-box-type-capacitor.html You could...

I try to avoid sockets for transistors, even germaniums. With IC sockets, you have the outward pressure of each parallel side pressing evenly against each row of sockets, which keeps them seated securely, but transistors don't have that advantage and can very easily come loose. I would try...

The calibration process has you insert the test signal into pin 13 of IC10, which is the same as the pads marked "TEST". If you're inserting it there instead of the input jack, then the issue is somewhere between the input jack and IC10. That doesn't narrow it down much, but it does rule out the...

Just to be clear, you restored the 1M or 2.2M RPD resistor, right? Because 100R is going to almost completely kill the signal before it gets to the first op-amp... we definitely do not want that! How did it bias? Were you able to get the target voltages from the build doc?

Truly thrilling to hear this and it's a lot of why I do what I do. And believe me, I also learned a whole lot during the development... it was definitely biting off more than I could chew at the time, but (provided it is paired with tenacity) it's the best way to learn, in the same way that...

I didn't see this or the other related threads when they were first posted - but reading through each of them I just want to say in the cheesiest way possible, I'M REALLY PROUD OF YOU ALL! I really do appreciate the spirit of trying to figure out the issue rather than going straight to assuming...