Search found 571 matches

by Bartimaeus
Wed Nov 18, 2020 3:11 pm
Forum: Music Tech DIY
Topic: DIY Real Spring Reverb Pedal?
Replies: 12
Views: 213

Re: DIY Real Spring Reverb Pedal?

why not just stick the pcbs from the music thing driver and the ai synthesis eurorack/pedal adaptor in one pedal box? but you're probably better off finding a schematic or stripboard layout. as the previous user mentioned, putting the actual springs in pedal will be way too noisy. but i'm pretty sur...
by Bartimaeus
Fri Nov 06, 2020 10:48 pm
Forum: Music Tech DIY
Topic: Piezo Sensors vs. Force Sensitive Resistance (differences in coding)
Replies: 3
Views: 103

Re: Piezo Sensors vs. Force Sensitive Resistance (differences in coding)

this is so vague as to be impossible to answer.

all i can say is... measure the voltage range from your sensors with a meter, then adjust the code to suit those values.
by Bartimaeus
Thu Oct 29, 2020 2:42 am
Forum: Music Tech DIY
Topic: Adding Led indicator for LFO
Replies: 11
Views: 256

Re: Adding Led indicator for LFO

i think guest is suggesting the latter – adding an led and resistor just before the 1k output resistor. the transistor circuit is great in low-current digital circuits, it prevents the led from weakening the control signal. but for a buffered analog lfo you have plenty of current anyway, so you can ...
by Bartimaeus
Wed Oct 28, 2020 10:55 pm
Forum: Music Tech DIY
Topic: Can i put capacitors in parallel?
Replies: 17
Views: 368

Re: Can i put capacitors in parallel?

even big companies use this trick. sometimes it's cheapest just to buy thousands of one value with the bulk discounts, and combine them get the nearby values that're only occasionally needed.
by Bartimaeus
Wed Oct 28, 2020 10:50 pm
Forum: Music Tech DIY
Topic: VCO for synth 1V/Octave and 9v supply?
Replies: 10
Views: 8802

Re: VCO for synth 1V/Octave and 9v supply?

another guitar people trick is to use an lt1054 or similar to get +/-9V from a 9V supply, which is adequate to run most synth circuits, if with less headroom. that's how i'd do it, to avoid dealing with biasing everything at 4.5V. however it'll eat a battery pretty quick...
by Bartimaeus
Wed Oct 28, 2020 3:53 pm
Forum: Music Tech DIY
Topic: Adding Led indicator for LFO
Replies: 11
Views: 256

Re: Adding Led indicator for LFO

looks fine to me, but that led is gonna be pretty bright with just a 1k resistor and a 12V supply. try 10k there, or 20k if it's a clear led.

a lot of resistors work at the base, the value really depends on what you're controlling it with. but 10k is pretty standard when it comes to gates in euro.
by Bartimaeus
Tue Oct 27, 2020 4:54 pm
Forum: Music Tech DIY
Topic: Digital Multimeter
Replies: 19
Views: 480

Re: Digital Multimeter

as someone who's also making some ornament & crime modules, any recommendations for a suitable benchtop one besides the tenma that's available for $250 or less?
by Bartimaeus
Fri Oct 23, 2020 9:53 am
Forum: Music Tech DIY
Topic: Wiring a les paul type guitar switch for an off/on/on synth switch
Replies: 4
Views: 103

Re: Wiring a les paul type guitar switch for an off/on/on synth switch

if you're ok with on/off/on instead, you can just use a center-off spdt like this: https://smallbear-electronics.mybigcommerce.com/spdt-center-off/ your guitar toggle probably works the same, but use a multimeter to figure out what each pin connects to first to find out. but if you want off/on/on, y...
by Bartimaeus
Tue Oct 20, 2020 10:13 pm
Forum: Music Tech DIY
Topic: Resistor packs
Replies: 8
Views: 230

Re: Resistor packs

they're really useful. i usually see them listed as resistor "arrays", in case that makes it easier for you to find some. you can get them with 1% tolerance or lower if you need it. bussed type is extra nice if you're connecting a bunch of resistors to ground, saves you from soldering a lot of extra...
by Bartimaeus
Sun Oct 18, 2020 3:17 pm
Forum: Music Tech DIY
Topic: Solution to clogged hole with solder
Replies: 24
Views: 475

Re: Solution to clogged hole with solder

it seems kinda unlikely to me that a $13 solder sucker will do what a $200 hakko desoldering gun in incapable of. drilling it out or changing up your technique seem more promising. heat it up with you solder iron and then dab a surplus resistor leg in and out. this may seem silly, but i can attest t...
by Bartimaeus
Sun Oct 11, 2020 10:48 am
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 352
Views: 47081

Re: uO_c 8hp ornament and crime.

i don't see anything too off about the build. here's an idea: try de-soldering R1, then measure the voltage on either side of it. that's the resistor connecting the DAC to the output buffer, so it the -10.7V is on the DAC side you know it's a DAC issue, and if the -10.7V is on the opamp side you kno...
by Bartimaeus
Tue Oct 06, 2020 6:20 pm
Forum: Music Tech DIY
Topic: thermally coupling AND matching transistors?
Replies: 15
Views: 442

Re: thermally coupling AND matching transistors?

rather than matching, could you instead use a more robust exponential converter that compensates for the differences? https://www.schmitzbits.de/expo_tutorial/
by Bartimaeus
Fri Oct 02, 2020 12:17 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 352
Views: 47081

Re: uO_c 8hp ornament and crime.

unfortunately the schematic doesn't have component numbers, but a lot of stuff is still identifiable: https://drive.google.com/file/d/0ByUu4ePJDmVnS3U1OUNiQ05heG8/view to check voltages, measure at the pins of the voltage regulators and make sure they match up to the voltages specified in the schema...
by Bartimaeus
Thu Oct 01, 2020 10:26 pm
Forum: Music Tech DIY
Topic: mod a Boss RE-20 to accept cv for tempo sync?
Replies: 34
Views: 10929

Re: mod a Boss RE-20 to accept cv for tempo sync?

I hate to bring up an old thread but there is one issue with my hack, when I connect the power, it seems the transistor is not engaged, so the pedal goes wild, and the tempo of the echos goes to maximum speed, so I usually just press the tap tempo pedal and it settles but - how can I fix this? I us...
by Bartimaeus
Thu Oct 01, 2020 10:17 pm
Forum: Music Tech DIY
Topic: uO_c 8hp ornament and crime.
Replies: 352
Views: 47081

Re: uO_c 8hp ornament and crime.

for output 1, have you tried removing the resistor connecting it to the opamp, so you can test that pin in isolation as it were? voltage fluctuation sounds like a problem with the power supply. have you measured whether the 5V, 3.3V, and reference voltages are all stable? you might want to double ch...
by Bartimaeus
Thu Oct 01, 2020 11:25 am
Forum: Music Tech DIY
Topic: Chorus question.
Replies: 4
Views: 196

Re: Chorus question.

what is there to investigate? both mono and stereo flanger and chorus effects take advantage of the Hass effect: we hear the effected instrument as a single instrument/sound, not as multiple.
by Bartimaeus
Thu Oct 01, 2020 1:15 am
Forum: Music Tech DIY
Topic: Chorus question.
Replies: 4
Views: 196

Re: Chorus question.

some fully featured chorus effects let you adjust both the chorus depth (the delay variation around the center) and also the overall delay time (the static delay time). adjusting the static delay time gives noticeably different sounds. after all, chorus, flanger, and modulated delay are all the same...
by Bartimaeus
Tue Sep 29, 2020 2:14 pm
Forum: Music Tech DIY
Topic: xicon minimum order on Mouser
Replies: 23
Views: 516

Re: xicon minimum order on Mouser

i'm sure you're right jaytee, but to be honest it still bugs me knowing if i order a resistor now and another later, that's another plastic bag i have to deal with. x20 or more for every module... i build a lot of modules, so maybe for most people it's probably not a big deal. no individual decision...
by Bartimaeus
Sun Sep 27, 2020 11:42 pm
Forum: Music Tech DIY
Topic: Which Thonk Vactrol for a passive LPG?
Replies: 4
Views: 166

Re: Which Thonk Vactrol for a passive LPG?

how snappy do you want it? that's the main thing i'd consider for a lpg. you can adjust for the on and off resistance values in various ways, but there's no way to speed it up if it's too sluggish for your taste. but most people don't use a lpg if they want speed anyway. also, the VTL5C3/2 is just t...
by Bartimaeus
Tue Sep 22, 2020 7:27 pm
Forum: Music Tech DIY
Topic: SMT: alternatives to hand-soldering?
Replies: 10
Views: 345

Re: SMT: alternatives to hand-soldering?

Are there any DIY manufacturers that include a stencil with their kits? I feel like that would be the ticket. from a fab house like elecrow it's ~$10 per stencil, whereas the pcbs are ~$1 each when you order a bunch you can get a stencil made by osh for any project that's open source and gives you ...
by Bartimaeus
Tue Sep 22, 2020 3:20 pm
Forum: Music Tech DIY
Topic: SMT: alternatives to hand-soldering?
Replies: 10
Views: 345

Re: SMT: alternatives to hand-soldering?

unless you're building a bunch of modules at once, paste and hot air is the way to go. the skillet makes things faster, but it also makes it more difficult to fix issues as they happen. with hot air, you can give every component as much heat as it needs, and easily fix any tombstones. it should stil...
by Bartimaeus
Thu Sep 17, 2020 12:37 am
Forum: Music Tech DIY
Topic: 1p Headers, Cables, and Panel Wiring Revisited!
Replies: 38
Views: 3132

Re: 1p Headers, Cables, and Panel Wiring Revisited!

necro because search brought me here and didn't solve my problem... i want some good pin headers. but basically all the links in this thread are dead, aside form L-1's advice about samtec. tayda is an option, and i've used them in the past. but it's easy for them to move around while you're solderin...
by Bartimaeus
Sun Sep 13, 2020 11:51 am
Forum: Music Tech DIY
Topic: Using an old signal generator with the modular
Replies: 10
Views: 288

Re: Using an old signal generator with the modular

for something like this (i.e. cool old device), wouldn't it be better to just disassemble the pot and scrub the washer with a little isopropyl alcohol and/or contact cleaner?
by Bartimaeus
Sun Sep 13, 2020 11:46 am
Forum: Music Tech DIY
Topic: Adapting Eurorack circuits as guitar pedals? (12v > 9v power, CV control, etc.)
Replies: 7
Views: 266

Re: Adapting Eurorack circuits as guitar pedals? (12v > 9v power, CV control, etc.)

if you want to do a lot less work converting from bipolar to unipolar, you can just get a MAX1044/TC1044 to generate +/-9V. you'll lose a little headroom compared to the original +/-12V, but that's probably not an issue when guitar signal levels are so much lower anyway.
by Bartimaeus
Sat Sep 12, 2020 6:08 pm
Forum: Music Tech DIY
Topic: pcb panel - keep cooper layer or not?
Replies: 7
Views: 200

Re: pcb panel - keep cooper layer or not?

Yes. The copper layer acts as a ground plane and reduces EMI coming out of the module. Keep it on, at least on the backside if you don't like the look on the front. note that this only works if your drill holes are pads that the jacks sleeves can make contact with to ground the panel (or if you con...

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