Recent content by Passinwind

I’ve been doing HPFs in most of my DIY bass amps and preamps for many years, usually with a bit steeper slope than Josh uses though. There’s a schematic and board share on my GitHub repository, but I think @Robert already has it covered here IIRC.

With a piezo lower Z loading tends to cut the lowest bass octave, which is not necessarily a bad thing for AUB. Especially with my resonant LPF pedals, which are pretty good at killing upper midrange quack. But as usual, it just depends. My friend was mostly playing bluegrass at that time, but...

The last acoustic upright pedal I did for a friend which had a Fishman BP100 pickup system ended up sounding best to us at ~700k, which was definitely a surprise. It was a really nice carved bass that she snagged for less than half what it was worth, I really loved having a go occasionally at...

Not yet, but I’d probably use one of my higher impedance open source preamp pedals as a front end, or maybe the 10meg Creation Labs Redeemer I have in a DI box. I sold off my EUB a couple of years ago and don’t currently own an acoustic one either, but I’d love to have both again if we move to a...

My new DIY tube bass amp is actually getting a switch like that this week. Since I only play active basses I started with a 100k input impedance, but I plan to go both higher and lower once the multiway switch goes in.

Yep, killing/neutering the pickups natural resonant peak with a tailored Z load so you can impose a variable one with a resonat LPF, for example. It tends to take a lot of trial and error, for me at least. Audere onboard preamps leveraged that concept pretty well (sans LPF), for one.

It's essentially a pretty basic Baxandall circuit, here's what's going on on both sides of the feedback resistor in that stage: True, but only at one pickup loading scenario unless you record multiple takes. A lot of my own bass preamps use non classical loading strategies and I'd like to...

Waveform correlation bewtween transient sine wave modeling and my oscilloscope was pretty good, next up is recording some clean guitar WAV files and running them through LTspice, maybe with a pickup sim included. Judging from my previous clean bass preamp modeling I expect that to be a...

I won this board in one of @fig 's contests a couple of years ago but just finally got around to building it up. It completes my current trio of ODs: hard clipper, soft clipper, opamp. As usual I did an LTspice model first so I could visualize what component swaps might do, and although I was...

Way to go!

4.5 mm, 5% : https://www.mouser.com/en/ProductDetail/TDK/B32529C105J?qs=CveI/UwZDBI3ZQ%2BS7xlvyQ== I’m mostly building very clean bass preamp/EQ stuff with THD typically measuring at hundredths or thousandths of a percent, but for distortion widgets I’m much less fussy. ;)

I still have several dozen of the 3.5mm 50V Wimas in stash, but heve been starting to use SMD tantalums or aluminum electrolytics in less critical coupling spots. I’ve also revised nearly all my open source preamp and EQ boards to work with TDK polyester caps in the 1-3.3uF value range.

Those guys defintely do listen and have on occasion started stocking various parts I've asked for over the years. Both Mouser and Digikey will at least look into doing so as well, IME.

The jacks have to be grounded too, and if you choose to use shielded leads it’s convenient to tie the shield ground right there. But you can do it many other ways if doing your own layout.

Those are pads for wiring to external input and output jacks, or alternatively to a footswitch.