Search found 601 matches

by Bartimaeus
Tue Jan 26, 2021 1:49 pm
Forum: Music Tech DIY
Topic: diy partial-kit frustration rant
Replies: 55
Views: 1495

Re: diy partial-kit frustration rant

Re: book gatekeeping - yes I don't think there's any better resources. I was just looking at the diy book resources funny enough. I still dont understand why experts like to punch down and suggest noobs are audio book learners or paint by numbers simpletons. That's literally the gatekeeping I was t...
by Bartimaeus
Tue Jan 26, 2021 12:46 pm
Forum: Music Tech DIY
Topic: diy partial-kit frustration rant
Replies: 55
Views: 1495

Re: diy partial-kit frustration rant

It is a simple way to look professional. But it doesn't help people when building. In 99.9% of the case you just say ohm, tolerance and power rating and it will be easier for everyone to source their components. Well, for through-hole I'd agree, but for SMD it's not a "bend those 5MM leads to fit 2...
by Bartimaeus
Thu Jan 21, 2021 4:15 pm
Forum: Music Tech DIY
Topic: Variable Attack/Release Slew
Replies: 6
Views: 215

Re: Variable Attack/Release Slew

The Morph-Lag is probably the most popular of these circuits, and is often credited as the source/inspiration for many others. There's plenty of discussion regarding the circuit online, for instance here: http://audiodiwhy.blogspot.com/2019/11/morph-lag-easy-shape-shifter.html i stumbled on that li...
by Bartimaeus
Thu Jan 21, 2021 2:14 am
Forum: Music Tech DIY
Topic: Variable Attack/Release Slew
Replies: 6
Views: 215

Re: Variable Attack/Release Slew

https://kassu2000.blogspot.com/2016/04/slope-generator.html This is a great write up on the long-tail pair (LTP). There are also links to further reading. thank you so much, this is exactly the sort of thing i was hoping for!! Maybe you can use my schematic as starting point: https://www.haraldswer...
by Bartimaeus
Wed Jan 20, 2021 2:08 pm
Forum: Music Tech DIY
Topic: Variable Attack/Release Slew
Replies: 6
Views: 215

Variable Attack/Release Slew

So Befaco makes this incredible slew limiter with voltage controlled attack and release: https://befaco.org/docs/Slew_Limiter/Slew_Limiter_V1_2_Schematic.pdf I'd like to build something similar, but simpler, without the voltage control (I'm actually planning to slap it onto the end of an envelope fo...
by Bartimaeus
Wed Jan 20, 2021 11:28 am
Forum: Eurorack Modules
Topic: Thoughts on my rack
Replies: 18
Views: 506

Re: Thoughts on my rack

i'm a bit surprised at the replies above - it seems impossible to give advice when you mention so little about what you're with it. what kind(s) of music do you make? or sound design? do you plan to use it live, or is it just for studio? if it's studio, you don't need nearly as many utilities, and c...
by Bartimaeus
Mon Jan 18, 2021 3:43 pm
Forum: Music Tech DIY
Topic: Same resistor but biger size and newbie questions.
Replies: 6
Views: 259

Re: Same resistor but biger size and newbie questions.

1/4w can often work in place of 1/2w. but without knowing the application, i can't say for sure.

the solder does not need to got through the pad. as long as it forms a good bond on the soldering side, adding extra solder doesn't really contribute anything.
by Bartimaeus
Sun Jan 17, 2021 11:17 am
Forum: Music Tech DIY
Topic: Same resistor but biger size and newbie questions.
Replies: 6
Views: 259

Re: Same resistor but smaller size.

more context would definitely help. but as long as the power rating is high enough, the size usually doesn't matter.
by Bartimaeus
Tue Jan 12, 2021 11:00 pm
Forum: Music Tech DIY
Topic: Double-sided SMT soldering
Replies: 9
Views: 369

Re: Double-sided SMT soldering

hot plate only helps for one side though. for the other, you'll still need hot air or hand soldering. still, a $30 one from target can make that first side a lot easier: https://www.sparkfun.com/tutorials/59 but if this is a one-off board, and you don't plan to do this often, use hot air for one sid...
by Bartimaeus
Tue Jan 12, 2021 10:56 pm
Forum: Music Tech DIY
Topic: Kikad pcb layout to front panel
Replies: 7
Views: 246

Re: Kikad pcb layout to front panel

to be honest, you'd be better off picking a point (such as the upper right corner), measuring the distance from that point to each component in kicad, and then replicating it in your cad software. bit of a pain, but it will guarantee that there aren't any scaling errors from export/import.
by Bartimaeus
Thu Jan 07, 2021 10:34 pm
Forum: Music Tech DIY
Topic: diy partial-kit frustration rant
Replies: 55
Views: 1495

Re: diy partial-kit frustration rant

in my experience, a lot of the pcb/panel sets that require obsolete parts are just... older. and you can't really blame the designer if the parts they selected have become obsolete. many of the modules i built just five years ago require substitutions now. if you want to avoid this without resorting...
by Bartimaeus
Wed Jan 06, 2021 8:57 am
Forum: Music Tech DIY
Topic: Fume extractor - Smoke absorbers?
Replies: 9
Views: 438

Re: Fume extractor - Smoke absorbers?

dot matrix madness wrote:
Wed Jan 06, 2021 3:26 am
Got a this desktop fume absorber recently.
You have to be rather close to it, but is works. The noise (39dB) is, however, annoying with time. Thus I thinking to put a foot switch
in between the power line.
i got one of those footswitches for my hakko, and it's been extremely useful
by Bartimaeus
Tue Jan 05, 2021 5:25 pm
Forum: Music Tech DIY
Topic: Cv out to filter problem. Help please. Pics added.
Replies: 10
Views: 272

Re: Cv out to filter problem.

do you have a schematic and photos? it's hard to say why your switch isn't working when we don't even know how you've wired it up
by Bartimaeus
Tue Jan 05, 2021 4:41 pm
Forum: Music Tech DIY
Topic: YATMA - Yet Another Transistor MAtcher ( for lazybones )
Replies: 80
Views: 12384

Re: YATMA - Yet Another Transistor MAtcher ( for lazybones )

... do you need a scope with memory to use this properly? no, scan rate is fast enough for any scope. Did you read the instructions ? if you compare less than 8 transistors you MUST connect all non used inputs to an input in use ! ah, thank you very much for explaining! from the description, it see...
by Bartimaeus
Mon Jan 04, 2021 8:16 pm
Forum: Music Tech DIY
Topic: YATMA - Yet Another Transistor MAtcher ( for lazybones )
Replies: 80
Views: 12384

Re: YATMA - Yet Another Transistor MAtcher ( for lazybones )

i build one of these (thanks to omega8870). it seems to work, but i can't get good results with my scope. do you need a scope with memory to use this properly? i see a train of pulses when i hook it up and add at least one transistor, but the readout stays the same regardless of how many transistors...
by Bartimaeus
Sun Jan 03, 2021 1:47 pm
Forum: Music Tech DIY
Topic: Standing resistors
Replies: 27
Views: 721

Re: Standing resistors

looks fine besides that one solder joint. Rex's vertical diodes look incredible, but in truth it doesn't matter how you mount/bend them so long as they're soldered well.
by Bartimaeus
Fri Jan 01, 2021 2:19 pm
Forum: Music Tech DIY
Topic: A joystick schematic acceptance
Replies: 10
Views: 393

Re: A joystick schematic acceptance

Do you mean like that? dead 0 volt zone.jpg So the diodes are just after the 4k7 that is connected to the middle lug of the joystick potentiometer? Diode can be 1N4148? and if I'm guessing right so the diode in both direction will block the voltage below +0.6v and above -0.6+? this is due to their ...
by Bartimaeus
Tue Dec 22, 2020 12:53 pm
Forum: Music Tech DIY
Topic: Fume extractor - Smoke absorbers?
Replies: 9
Views: 438

Re: Fume extractor - Smoke absorbers?

i love my hakko fa-430, one of the best investments i've made. but some weeks i spent 15hrs+ soldering, which would be a lot of exposure without it. for people soldering a couple hours every so often, it's likely overkill. one thing i've noticed that with the smaller benchtop units, they absorb most...
by Bartimaeus
Fri Dec 18, 2020 1:44 am
Forum: Music Tech DIY
Topic: 2164s vs OTAs (13700) what are the differences?
Replies: 26
Views: 529

Re: 2164s vs OTAs (13700) what are the differences?

the application note for filter design with the SSI2164 does a pretty good job of explaining: http://www.soundsemiconductor.com/downloads/AN701.pdf

but tldr, you can't just swap one for the other.
by Bartimaeus
Tue Dec 15, 2020 11:00 am
Forum: Music Tech DIY
Topic: Two diodes cathode facing each other
Replies: 13
Views: 350

Re: Two diodes cathode facing each other

they are there only for not having to worry about ESDs. No “functional” impact with input signals in the modular range. https://forum.mutable-instruments.net/t/new-ripples-what-are-the-diodes-at-the-inputs/17034 the tides schematic has some parts numbers as well: https://mutable-instruments.net/mod...
by Bartimaeus
Tue Dec 15, 2020 10:50 am
Forum: Music Tech DIY
Topic: My $1.50 4Q Multiplier with 2 MC1496
Replies: 46
Views: 976

Re: My $1.50 4Q Multiplier with 2 MC1496

Was just thinking, with the simple multiplier topology, the less linearized the output is from the OTA, the worse (mustache-shaped) bleedthru you will get due to this type of multiplier working on feeding an inverter version of the original carrier in at the end. Seems like an easy to way go reduce...
by Bartimaeus
Mon Dec 07, 2020 1:51 pm
Forum: Eurorack Modules
Topic: Feedback on direction for my rack
Replies: 5
Views: 167

Re: Feedback on direction for my rack

"but as I am not near my computer, I cannot loop back what I've created" it sounds like you just need to adjust your setup so you can integrate your modular better with your computer. being able to loop sections and build on top of what you're already doing is very useful to move beyond static loopi...
by Bartimaeus
Sun Dec 06, 2020 7:09 pm
Forum: Music Tech DIY
Topic: Help me understand this Electro Harmonix Schematics
Replies: 19
Views: 546

Re: Help me understand this Electro Harmonix Schematics

so someone did change out the original footswitch for true bypass. assuming they did that mod correct, you should be able to replace it with any old DPDT (or a 3PDT if you want to add an indicator LED too).
by Bartimaeus
Sun Dec 06, 2020 12:03 pm
Forum: Music Tech DIY
Topic: Help me understand this Electro Harmonix Schematics
Replies: 19
Views: 546

Re: Help me understand this Electro Harmonix Schematics

do you have a photo of how the current footswitch is wired? the original stock bypass is not true bypass, and it's not buffered either. the circuit is always connected to the input signal (via the 10uf Cap near the input). as with a passive multiple splitting signal, the input signal can be affected...
by Bartimaeus
Sat Dec 05, 2020 2:36 pm
Forum: Music Tech DIY
Topic: in 2020 which Tayda parts do you buy, which do you avoid?
Replies: 38
Views: 1140

Re: in 2020 which Tayda parts do you buy, which do you avoid?

i remember those old resistors, pale blue with the crazy thin (and sometimes oxidized) leads. the new dark blue ones are much nicer to work with. i haven't seen them add any new guitar effects pcbs in the past couple years, so i think you're right that they're shifting focus to more general diy. it'...

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