Search found 216 matches

by SlightlyNasty
Wed Jan 20, 2021 8:19 pm
Forum: Music Tech DIY
Topic: The 2021 Show Us Your DIY Builds Thread!
Replies: 115
Views: 5611

Re: The 2021 Show Us Your DIY Builds Thread!

Haralds:Werk wrote:
Mon Jan 18, 2021 9:34 am
Sequencer Nostalgia

This was my first build when I came back to SDIY. A three row/16 step sequencer. Completely build on stripboard. Still working after all this years. Only hand sketched schematics. Nothing to publish. Pictures only.
Love the modular approach with the step banks. What a beauty!
by SlightlyNasty
Thu Jan 14, 2021 9:25 am
Forum: Music Tech DIY
Topic: The 2021 Show Us Your DIY Builds Thread!
Replies: 115
Views: 5611

Re: The 2021 Show Us Your DIY Builds Thread!

Thanks, it's actually just printer paper glued on with spray adhesive - I had to lay out the stripboard layout in KiCAD because it was such a small space to squeeze it all into! That second photo was before I wired it all up though, so it does look a bit messier now. I'll do some audio samples once ...
by SlightlyNasty
Wed Jan 13, 2021 10:16 pm
Forum: Music Tech DIY
Topic: Kikad pcb layout to front panel
Replies: 7
Views: 245

Re: Kikad pcb layout to front panel

I do what Bartimaeus says for my panels - in KiCAD at the bottom of the screen you have both global coordinates and a second set that you can zero by putting the cursor where you want the new origin to be and then hitting space bar. Usually I'll have an outline of the physical control panel in the "...
by SlightlyNasty
Wed Jan 13, 2021 10:07 pm
Forum: Music Tech DIY
Topic: The 2021 Show Us Your DIY Builds Thread!
Replies: 115
Views: 5611

Re: The 2021 Show Us Your DIY Builds Thread!

Trying to make use of all my low-gain Soviet MP-26A germaniums, this is a quick stripboard proto of an amp-style germanium drive/preamp pedal. It uses two directly cascaded differential pairs with fixed emitter currents (I feel like diff. pair distortions are really underrated in the pedal world) an...
by SlightlyNasty
Tue Dec 22, 2020 6:04 am
Forum: Music Tech DIY
Topic: Clocked Control Voltage
Replies: 14
Views: 293

Re: Clocked Control Voltage

I'd just use something like a 74HC binary counter IC and an R-2R DAC.
by SlightlyNasty
Wed Dec 16, 2020 1:56 am
Forum: Music Tech DIY
Topic: Routing Switch / Mult
Replies: 1
Views: 128

Re: Routing Switch / Mult

That opamp is going to attempt to track its floating positive input in that configuration, disconnecting the input doesn't disconnect the action of the amplifier. Why don't you just have path A permanently connected and have the opamp as a voltage follower with its output switched via the SPDT (plus...
by SlightlyNasty
Sun Nov 29, 2020 12:20 am
Forum: Music Tech DIY
Topic: 100k input resistance... isn't
Replies: 89
Views: 2618

Re: 100k input resistance... isn't

Is that less of a problem with bananas anyway? Since, unlike eurorack, you're not briefly shorting the output to ground every time you patch it? You still get lots of incidental shorting on 4U just from jacks bumping against each other when you're patching, or shorting on case fittings etc. It's ge...
by SlightlyNasty
Wed Nov 25, 2020 7:10 pm
Forum: Music Tech DIY
Topic: Yamaha MG 16/4
Replies: 6
Views: 343

Re: Yamaha MG 16/4

You can usually just get away with changing either the capacitor value or the resistor value, though with a change as substantial as the one you're after for the mid band I'd swap out the capacitors, in order to keep the impedances similar for the rest of the circuit. Using online calculators should...
by SlightlyNasty
Wed Nov 25, 2020 2:06 am
Forum: Music Tech DIY
Topic: Yamaha MG 16/4
Replies: 6
Views: 343

Re: Yamaha MG 16/4

The highpass is a textbook second-order active filter - you can find some more info HERE (scroll down and you'll see the exact same circuit). The important bits are the two RC networks C110/R117 and C111/R118 that determine the cutoff frequency / response curve. C112 will just be for stability. It's...
by SlightlyNasty
Tue Nov 24, 2020 10:24 pm
Forum: Music Tech DIY
Topic: 100k input resistance... isn't
Replies: 89
Views: 2618

Re: 100k input resistance... isn't

Interesting discussion (really), but I got to say I'm a little surprised at some of the response. There's no denying that Neil in his original post has a point. If you have a 1v/OCT output with a 1K output impedance and you plug it into an input with an unknown impedance, it's going to go out of tu...
by SlightlyNasty
Mon Nov 23, 2020 9:45 pm
Forum: Music Tech DIY
Topic: 100k input resistance... isn't
Replies: 89
Views: 2618

Re: 100k input resistance... isn't

At this point we have made the system significantly worse from the user's perspective just to obey the rules we made up that "input impedance must not be variable" and "output resistors are forbidden." Those were not real problems and they didn't need to be solved. It's not engineering anymore; it ...
by SlightlyNasty
Sat Jun 20, 2020 11:09 pm
Forum: Music Tech DIY
Topic: Drill Press Recommendations
Replies: 23
Views: 1223

Re: Drill Press Recommendations

I just spent ages looking through local tool shops until I found the one affordable chinese press that was made entirely out of big chunks of real metal and had no discernable play or runout in the chuck. For me, big, dumb and heavy are the order of the day when it comes to drill presses.
by SlightlyNasty
Tue Jun 02, 2020 9:11 pm
Forum: Music Tech DIY
Topic: The 2020 Show Us Your DIY Builds Thread!
Replies: 532
Views: 47588

Re: The 2020 Show Us Your DIY Builds Thread!

What a coincidence - I literally spent the weekend designing a phaser pedal for myself. That looks fantastic! I also ended up with a swag of old Dymo tapes when we cleared out my late Grandfather's place a few years ago that end up on my pedal builds as well, all those cool matte finish tapes that s...
by SlightlyNasty
Mon Jun 01, 2020 8:03 pm
Forum: Music Tech DIY
Topic: 3 and 4 bit ADCs?
Replies: 41
Views: 2015

Re: 3 and 4 bit ADCs?

Re: underlined. How so? It's as accurate as the resistors and math behind them. Yeah, I should have clarified - my circuit wasn't especially accurate - it used opamp comparators and E24 values that were pretty much pulled out of the air because I didn't need anything more than to divide up a CV ran...
by SlightlyNasty
Mon Jun 01, 2020 2:22 am
Forum: Music Tech DIY
Topic: 3 and 4 bit ADCs?
Replies: 41
Views: 2015

Re: 3 and 4 bit ADCs?

I've got a design somewhere that uses one comparator per bit, using the output to level shift the input of the subsequent comparator - but looking at that PAIA circuit it seems to be doing the same thing. Not especially accurate, but good for quick and dirty CV control of discrete parameters.
by SlightlyNasty
Wed Mar 18, 2020 12:50 am
Forum: Your Tunes Here
Topic: Some dumb, fun video game cover videos
Replies: 1
Views: 259

Some dumb, fun video game cover videos

So these were originally just some fun little one-minute videos I put together to share on my personal Instagram page as an "identify the game" sort of thing, but I figured I'd edit them together and throw them up on Youtube for others to enjoy. Not really Slightly Nasty content - but the modular ap...
by SlightlyNasty
Sun Mar 15, 2020 9:21 pm
Forum: Music Tech DIY
Topic: The 2020 Show Us Your DIY Builds Thread!
Replies: 532
Views: 47588

Re: The 2020 Show Us Your DIY Builds Thread!

Huge thank you to Slightly Nasty for designing these modules. They were a joy to build and easy to get working with the mods posted. Design layout is my favorite 4U I've come across, the oscillators are IC free and the sound is killer! Need to cut a better case in the future and maybe double the si...
by SlightlyNasty
Fri Mar 06, 2020 2:12 am
Forum: Music Tech DIY
Topic: [INTEREST CHECK] Model 1011 Discrete 4U VCO
Replies: 153
Views: 14129

Re: [INTEREST CHECK] Model 1011 Discrete 4U VCO

Anyway, I took a look at the schematics and I think I traced the problem to the comparator. I have a really small signal at the node between C201 and Q202. Before the cap, its seems to be ok, but after, it is really low (around the 200mV range). Should I expect this? Maybe a fried BC550? Off the to...
by SlightlyNasty
Thu Mar 05, 2020 8:51 pm
Forum: Music Tech DIY
Topic: Best way to paint/spray aluminium?
Replies: 22
Views: 988

Re: Best way to paint/spray aluminium?

I like to use high-temp auto enamel - the stuff you use to paint engine parts and so on - because you can quickly cure it in the oven and it's very durable. I just sand the bare aluminium with something like a 400 grit to give it some tooth, clean it with some sort of paint prep or IPA like devinw1 ...
by SlightlyNasty
Sat Feb 29, 2020 3:07 am
Forum: Music Tech DIY
Topic: rhythm wolf teardown: any questions?
Replies: 219
Views: 11977

Re: rhythym wolf teardown: any questions?

Jumbuktu wrote:
Mon Feb 24, 2020 11:54 pm
Hey you might have mine! I also modded the Howl pot to reduce the impact a bit.
The one with the grey hihat decay knob?

Got to say, the bass drum mod is the one thing that's intriguing me the most. Might have look into that whenever the idea of undoing 50,000 screws seems appealing.
by SlightlyNasty
Wed Feb 19, 2020 1:28 am
Forum: Music Tech DIY
Topic: rhythm wolf teardown: any questions?
Replies: 219
Views: 11977

Re: rhythym wolf teardown: any questions?

have you pinned out all the individual voices? they labelled it internally for that, and i think that would make post processing a lot easier. The previous owner did - as well as adding the open hat decay knob mod - but honestly I almost never use them (I really like the intermodulation effects and...
by SlightlyNasty
Tue Feb 18, 2020 11:19 pm
Forum: Music Tech DIY
Topic: rhythm wolf teardown: any questions?
Replies: 219
Views: 11977

Re: rhythym wolf teardown: any questions?

I like the Rhythm Wolf, despite its many, MANY flaws. It's a fun box of quirky primitive drum sounds that respond really well to processing and distortion. The synth voice is fun to play with when you're mashing it all through effects, just to see how it reacts with everything. It's not a great mach...
by SlightlyNasty
Sun Feb 16, 2020 7:46 pm
Forum: Music Tech DIY
Topic: The 2020 Show Us Your DIY Builds Thread!
Replies: 532
Views: 47588

Re: The 2020 Show Us Your DIY Builds Thread!

Your panels are always stunning, soup!
by SlightlyNasty
Fri Jan 31, 2020 12:09 am
Forum: Music Tech DIY
Topic: The 2019 Show Us Your DIY Builds Thread
Replies: 356
Views: 55358

Re: The 2019 Show Us Your DIY Builds Thread

Thanks everyone! I'm running pretty much everything through it at the moment, it's a nice character piece with a good dash of even-harmonic distortion. I've often dreamed of making some studio gear (compressors, pre amps, etc..) being that so much of the old classic stuff is just phenomenally expens...
by SlightlyNasty
Mon Dec 30, 2019 11:39 pm
Forum: Music Tech DIY
Topic: Evenfall Mini Modular
Replies: 12
Views: 1222

Re: Evenfall Mini Modular

Very cool - take off the rack ears and you'd basically have one of the modern desktop mini-modulars. Certainly impressive for that era.

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