Search found 1160 matches

by Mungo
Mon Oct 19, 2020 4:15 pm
Forum: Music Tech DIY
Topic: Anyone recommend a US source of reasonably priced tants?
Replies: 11
Views: 199

Re: Anyone recommend a US source of reasonably priced tants?

Several Haible Designs use them. What’s the supposed benefit over “regular” electro caps? Historically they were smaller in size for the same ratings. But there have been improvements in low ESR electrolytics, and closely related aluminium "polymer" caps are newer replacements for tantalum. such as...
by Mungo
Mon Oct 19, 2020 2:00 am
Forum: Music Tech DIY
Topic: Solution to clogged hole with solder
Replies: 24
Views: 385

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. The best spring loaded solder suckers pull more pressure than the desoldering guns (shop air venturi or pump types). The advantgae of the guns are they heat up all around the pad at the...
by Mungo
Mon Oct 19, 2020 12:03 am
Forum: Music Tech DIY
Topic: Anyone recommend a US source of reasonably priced tants?
Replies: 11
Views: 199

Re: Anyone recommend a US source of reasonably priced tants?

B0bcat wrote:
Sun Oct 18, 2020 9:29 pm
Several Haible Designs use them. What’s the supposed benefit over “regular” electro caps?
Historically they were smaller in size for the same ratings. But there have been improvements in low ESR electrolytics, and closely related aluminium "polymer" caps are newer replacements for tantalum.
by Mungo
Sat Oct 03, 2020 1:46 am
Forum: Eurorack Modules
Topic: Ultrasounds?
Replies: 23
Views: 586

Re: Ultrasounds?

I believe Mungo's VCO's and oscillating filters can all go into ultrasonic range. according to the manuals they appear to go up to 'in excess' of 20KHz - this may give you some unstable bars - or wobbly vertical lines, but not many - the cadet pcb/panel set I linked to will give stable vertical bar...
by Mungo
Fri Sep 18, 2020 6:43 am
Forum: Music Tech DIY
Topic: Delay midi clock events using Arduino+Midi Shield
Replies: 26
Views: 256

Re: Delay midi clock events using Arduino+Midi Shield

Too long a delay and it'll drop/miss bytes. The maximum possible is 1 second/(31250 baud/9 bits) = 288us including the instructions outside the delay call. This is the point where it's better going to a fixed interrupt period to keep the timing accurate, and varying the depth of the delay buffer (an...
by Mungo
Tue Sep 15, 2020 2:44 am
Forum: Music Tech DIY
Topic: Delay midi clock events using Arduino+Midi Shield
Replies: 26
Views: 256

Re: Delay midi clock events using Arduino+Midi Shield

4. every 78us, read out to the serial port whatever data the pointer is pointing at (if that value is 0, dont read it out), and then check if there is new data available at the serial port. if there is, write that data, if not, write a 0. then increment the pointer and go back to waiting. if the po...
by Mungo
Mon Sep 14, 2020 9:42 pm
Forum: Music Tech DIY
Topic: Solid copper wire for builds?
Replies: 15
Views: 435

Re: Solid copper wire for builds?

The silver colour is usually tin plated copper wired, its much easier to solder to than raw copper.
by Mungo
Wed Sep 09, 2020 10:36 pm
Forum: Music Tech DIY
Topic: How to minimise unintended noise from a module intended to generate noise?
Replies: 3
Views: 165

Re: How to minimise unintended noise from a module intended to generate noise?

I think you may be over-playing this in your head. If anything, a transistor white-noise module is less likely to create noticeable problems than a typical oscillator module. Just make sure you follow good power decoupling practices and you'll be fine. I agree, the module described is probably more...
by Mungo
Tue Sep 08, 2020 6:42 pm
Forum: Music Tech DIY
Topic: Piezo Preamp - Ideas & Improvements
Replies: 31
Views: 409

Re: Piezo Preamp - Ideas & Improvements

... 7. for the unbalanced out i would use a 10uF/10k highpass to recenter the signal around ground, and then follow with the 100ohm resistor. for the balanced out, something like this is not strictly necessary, as its the difference between the lines that matter. there are pros and cons of putting ...
by Mungo
Tue Sep 08, 2020 6:30 pm
Forum: Music Tech DIY
Topic: Piezo Preamp - Ideas & Improvements
Replies: 31
Views: 409

Re: Piezo Preamp - Ideas & Improvements

For example Mackie use 120Ohms on the output of their unbalanced Insert Jacks, but their XLR outputs are 220 Ohms in series with 100 Ohms in the live XLR pin giving a series resistance of 320 Ohms in parallel with 47k to ground which is about 300Ohms, and the same on the return pin. Soundcraft mean...
by Mungo
Mon Sep 07, 2020 8:07 pm
Forum: Music Tech DIY
Topic: Piezo Preamp - Ideas & Improvements
Replies: 31
Views: 409

Re: Piezo Preamp - Ideas & Improvements

It has a stance but it doesn't correspond to what most ProAudio kit does. Indeed ProAudio kit rarely needs more voltage, what it does need is to know exactly what that voltage is and hence impedances need to be accurate. Jacks often do have a low output impedance but XLRs are generally run at 600 O...
by Mungo
Mon Sep 07, 2020 5:58 pm
Forum: Music Tech DIY
Topic: Piezo Preamp - Ideas & Improvements
Replies: 31
Views: 409

Re: Piezo Preamp - Ideas & Improvements

What's wrong with 100R resistors in series with the output? That's pretty standard for outputs going out into the world via jacks. Because XLRs aren't jacks where you see anything from 50 to 300Ohms output impedance, or even near zero ohms sometimes. When you see XLRs most people expect them to be ...
by Mungo
Mon Sep 07, 2020 12:33 am
Forum: Music Tech DIY
Topic: Explanation of how modules "putting noise on the ground" bus?
Replies: 32
Views: 1243

Re: Explanation of how modules "putting noise on the ground" bus?

A related question: one issue that comes up from time to time is where VCOs sync with each other because of signals on the power lines between them, preventing the desired chorus effect of slightly detuned oscillators. It seems something more likely when you have a pcb with multiple vcos, but also ...
by Mungo
Sat Sep 05, 2020 11:19 pm
Forum: Music Tech DIY
Topic: toggle switch protection
Replies: 9
Views: 243

Re: toggle switch protection

There are also toggle switches with "locking" actuators that need to be pulled out slightly before they will move (many many combinations of positions and locks!)
by Mungo
Mon Aug 24, 2020 6:39 pm
Forum: Music Tech DIY
Topic: Suggested ways to supply + and - power :: bench power supply?
Replies: 16
Views: 344

Re: Suggested ways to supply + and - power :: bench power supply?

I'm the only one who sells bus boards like this that I know of. You must have done very little research to miss the almost identical example from Befaco: https://shop.befaco.org/en/power-solutions/5-regulated-power-bus.html or Elbys completely over the top fully regulated design: https://www.elby-d...
by Mungo
Sun Aug 23, 2020 8:40 pm
Forum: Music Tech DIY
Topic: Suggested ways to supply + and - power :: bench power supply?
Replies: 16
Views: 344

Re: Suggested ways to supply + and - power :: bench power supply?

The answer is usually... buy more power supplies. They aren't expensive!
by Mungo
Sun Aug 23, 2020 6:09 pm
Forum: Music Tech DIY
Topic: Suggested ways to supply + and - power :: bench power supply?
Replies: 16
Views: 344

Re: Suggested ways to supply + and - power :: bench power supply?

Just wondering how most people are supplying these voltages are you using a bench power supply? Bench supply advantages: Adjustable voltage (powers 12V and 15V circuits) Current meters Fixed power supply (eurorack power supply or other) advantages: Not adjustable voltages (can't accidentally set/bu...
by Mungo
Sun Aug 23, 2020 5:59 pm
Forum: Music Tech DIY
Topic: Suggested ways to supply + and - power :: bench power supply?
Replies: 16
Views: 344

Re: Suggested ways to supply + and - power :: bench power supply?

I'm the only one who sells bus boards like this that I know of. You must have done very little research to miss the almost identical example from Befaco: https://shop.befaco.org/en/power-solutions/5-regulated-power-bus.html or Elbys completely over the top fully regulated design: https://www.elby-d...
by Mungo
Sun Aug 23, 2020 5:51 pm
Forum: Eurorack Modules
Topic: Best Comb Effect
Replies: 27
Views: 1016

Re: Best Comb Effect

there is no capacitor in a digital comb filter. it is the ONLY filter you will ever see without a capacitor. Trying to make a generalisation such as that is neither useful, or true. There is no capacitor in a digital bi-quad, is that comb filter? No. A whole world of varied filters exist beyond the...
by Mungo
Mon Jul 27, 2020 6:14 am
Forum: Eurorack Modules
Topic: Cable Resistance
Replies: 28
Views: 841

Re: Cable Resistance

Highest practical output resistance: 1kOhm
Shielded/coax cable capacitance: 100pF/m
Cutoff frequency > 1MHz

So, either could be 10x worse and still not a problem.
by Mungo
Sun Jul 26, 2020 1:31 am
Forum: Eurorack Modules
Topic: How applicable are current draw numbers for modules?
Replies: 5
Views: 198

Re: How applicable are current draw numbers for modules?

The manufacturer quoted figures for modules are generally worst case/maximum, unless otherwise noted (vacuum tube cold start for example). Two confusing things: Power supplies may not be stable or reliable with varying loads or large capacitive loads. Power supplies are often using inflated specific...
by Mungo
Mon Jul 13, 2020 3:59 am
Forum: Eurorack Modules
Topic: Akai S950 Sampler Sound - ALM MUM M8 and samplerate-reduction?
Replies: 24
Views: 938

Re: Akai S950 Sampler Sound - ALM MUM M8 and samplerate-reduction?

it has been mentioned here but the Rossum Assimil8tor can do bit reduction, down to 1 bit, continuously, under CV control can control the interpolation algoritm from propiety, to EMU E4 to drop sample (nearest-neighbour) behavior - and beyond But it is sill playing back with a fixed sample rate, so...
by Mungo
Sun Jun 21, 2020 6:19 am
Forum: Eurorack Modules
Topic: Mungo Enterprises c1, convolution, delay, sampler
Replies: 54
Views: 4960

Re: Mungo Enterprises c1, convolution, delay, sampler

Possibly the only confusion with the pitch tracking input is that it "holds" the frequency of the signal that was driving it once it has been disconnected. Otherwise its simply another way to shift the frequency of the sampling/convolution, every doubling of the frequency at the clock input doubles ...
by Mungo
Sat Jun 20, 2020 10:39 pm
Forum: Music Tech DIY
Topic: Drill Press Recommendations
Replies: 23
Views: 861

Re: Drill Press Recommendations

If you insist on a new, cheap benchtop jobbie, then the one from Baileigh isn't awful. The Rikon is better than most of the cheap junk, and the one on Amazon called WEN 4210 is supposed to be the easiest one to adjust and tune...it's also made almost completely of cast iron! The 4214 variable speed...
by Mungo
Fri Jun 19, 2020 5:51 pm
Forum: Eurorack Modules
Topic: Going to build a high quality case/psu/bussboard
Replies: 20
Views: 692

Re: Going to build a high quality case/psu/bussboard

There is no single way to do it, there will be differences and each manufacturer should be the "correct" advice for their product.

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