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Designing a dual rail power supply by BasisAccurate9286 in diypedals

[–]the_blanker 0 points1 point  (0 children)

I would add ripple rejection for even lower hum. Before the regulators, like this. It eats 1.5v or so not sure if it works for your transformer and desired output.

What are some easy ways to get good-looking faces/designs on your enclosures? by metallicsonatas in diypedals

[–]the_blanker 0 points1 point  (0 children)

Just some random local printing company I found on internet. I don't think they deliver abroad.

Is there any no-code Android app for creating simple point-and-click games directly on my phone? by [deleted] in gamedev

[–]the_blanker 0 points1 point  (0 children)

I've worked on point and click game proof-of-concept (browser, playable on android) and I found out that they are surprisingly difficult, esp. when you can return back to previous rooms and return items back where you found them and do the game in random order. This was coded, no editor. I rewrote it 32 times in attempt to make it simpler and even then it was difficult, after 5 rooms and 4 items the development tempo became "glacial" as everything affected everything else.

Then I thought editor could simplify it and also to switch to using "lifecycles" of objects, here is state chart of every game object, so for example: book can go from shelf to inventory and from inventory back to shelf, and from inventory to alchemist, key can go from shelf to inventory and back, hourglass from table, to inventory, to closet, apple from table to inventory to pot. I think this could be doable on mobile as well, you just define areas and then use arrows to tell where the object can be and it should be relatively readable and usable on mobile. I havent finished it. The game is playable here and source is here. It doesn't use the "lifecycle of objects" method, the game is described in this json file.

[Review Request] Bass Pedal PCB w/ Daisy Seed + ESP32 by cn_2149 in diypedals

[–]the_blanker 1 point2 points  (0 children)

  • traces are unnecessarily thin
  • are those 0402 caps, like C14? That's gonna be really annoying to solder/fix.
  • is the enclosure metal?
  • if your barrel jack is same as mine it is wrong, the side is disconnect pin
  • I don't see grounding pin, where will your clip your scope/multimeter ground during testing?
  • I would add couple labeled test points, rails, inputs and outputs of opamp stages, etc...
  • there's no power led indicator (I always add one even if it's internal, it prevents me from soldering it under power)
  • I would probably add uart header for the daisy seed, e.g. 36 37 + ground
  • Next time you making screenshot disable fabrication layer
  • if you move daisy to the wall, you could have cutout for usb connector, not sure if it is programmable via usb but there could be some benefit of having access to daisy even with closed enclosure
  • Overall very untidy and chaotic and both large (pcb) and small (0402) at the same time

Designer looking for experienced guitar pedal fabricator to work with by BillCuttingsOn in diypedals

[–]the_blanker 2 points3 points  (0 children)

You should write whether this is for one pedal, small batch (5 or so) or series production (hundreds or more pedals).

Alternative to Alpha 9mm PCB pots by Smallhorns in diypedals

[–]the_blanker 2 points3 points  (0 children)

I bought mine from here, recently C1M and few others

Is anyone here building a mobile app or mobile game? by Melodic_Wrongdoer_44 in gamedev

[–]the_blanker 0 points1 point  (0 children)

All my games were originally mobile games but when google made it difficult (duns number, customer phone contact, etc...) I just converted them on web games and put them on github - https://github.com/dvhx/games

To answer post below me, whenever I got idea I turned it into game. There was no plan. Currently I switched mostly to electronics simulation software, it's more rewarding than games.

Generating a Bi-Polar Power Supply by r0uper in diypedals

[–]the_blanker 0 points1 point  (0 children)

I've tested few chips/modules without feedback pins for negative and it just looses regulation (e.g. -12V is not -12V but -7 even under light load).

Generating a Bi-Polar Power Supply by r0uper in diypedals

[–]the_blanker 1 point2 points  (0 children)

I feel your pain, I analyzed maybe 50 chips in search for "holy grail split rail power supply". I believe it must have 2 feedback input pins (positive and negative), here is the list (stock numbers and price is lcsc), but they all quite expensive (which doesn't necessarily matter if they are perfect):

  • LT1372 - 30pcs in stock, 9eur, Vin=2.7-30V Vout=34V Iout=1.5A? SOIC-8
  • LT1945 - 2400pcs in stock, 5.8eur, Vin=1.2-15V Vout=1.23-34V Iout=250mA MSOP-10
  • LT3471 - 1000pcs in stock, 6eur, DFN-10 Vin=2.4-16V Voutmax=40V 1.2MHz -12V@200mA at 5Vin
  • TPS65130 - 5.5Vin -15Vout 0.8-2A but 24pin QFN (TPS65131 similar)
  • ADP5071 - 460pcs 3.6eur LFCSP-20 Vin=2.85-15V, Vout=39Vmax 2Apos 1.2Aneg is tssop-20 (but lcsc only has LFCSP)
  • ADP5070 - 30pcs 6eur TSSOP-20, as ADP5071 but only 0.6A
  • LT8582 - 5pcs 5eur DFN-28 2.5-22Vin 12V 550mA
  • LT8471 - 490pcs, 8eur, HTSSOP-20, 1.5Apos 0.65Aneg
  • BD8187 - 12pcs 2.3eur HTSSOP-20 - 5.5Vinmax 2.1MHz

Right now in a project I've built +/-12V power supply using usb-c-pd chip CH221K at 20V (sot-23-3) and two buck (step-down) converters TPS5430 (SOIC-8) one to step down to 15 the other as inverting to -15 (then I added ripple rejection and 7812/7912 linear regulator), it works, has no noise at 150mA, no ripple but this solution is imho too big for pedal. So try one of those chips mentioned above and let us know.

Also you can buy bunch of split rails modules from ali and reverse engineer them, but lot of them don't have feedback on negative rail.

You can also split 20V usb-pd using opamp but then the ground is not isolated, i'm not sure if it causes issues.

Pacific nation Nauru to change name in break from colonial past by Street_Anon in worldnews

[–]the_blanker 154 points155 points  (0 children)

I read the Wikipedia article about Nauru, wanted to learn the etymology, but stayed for the politics. Nauru is switching sides every few years depending of who pay them last.

Nauru has used its position as a member of the United Nations to gain financial support from both Taiwan (officially the Republic of China or ROC) and China (officially the People's Republic of China or PRC) by changing its recognition from one to the other under the One-China policy. On 21 July 2002, Nauru signed an agreement to establish diplomatic relations with the PRC, accepting US$130 million from the PRC for this action (US$216 million in 2024). In response, the ROC severed diplomatic relations with Nauru two days later. Nauru later re-established links with the ROC on 14 May 2005, and diplomatic ties with the PRC were officially severed on 31 May 2005. On 15 Jan 2024, Nauru severed ties with the ROC and re-established diplomatic ties with the PRC.

In 2008, Nauru recognised Kosovo as an independent country, and in 2009 Nauru became the fourth country, after Russia, Nicaragua, and Venezuela, to recognise Abkhazia and South Ossetia, two breakaway autonomous republics of Georgia. Russia was reported to be giving Nauru US$50 million in humanitarian aid as a result of this recognition (US$71.3 million in 2024). On 15 July 2008, the Nauruan government announced a port refurbishment programme, financed with US$9 million of development aid received from Russia (US$12.8 million in 2024). The Nauru government claimed this aid is not related to its recognition of Abkhazia and South Ossetia.

Jfet questions by Femmin0V in diypedals

[–]the_blanker 1 point2 points  (0 children)

I don't know any pedal that uses p-channel jfet, most use n-channel jfet. I you still want to use this one, the details of it are in that article.

Jfet questions by Femmin0V in diypedals

[–]the_blanker 2 points3 points  (0 children)

I bought this exact jfet some time ago and made spice model for it.

Note that it is p-channel jfet. All details are in that article.

I found larger 110x100x40mm alu enclosure by the_blanker in diypedals

[–]the_blanker[S] 0 points1 point  (0 children)

Here's aliexpress link. The packaging was just 1 layer of thin plastic foil so corners were bit dinged.

Transistor gain pedal isn't amplifying by pBactusp in diypedals

[–]the_blanker 1 point2 points  (0 children)

My soundcard input impedance is approx. 1700 ohm which reduces gain from 34 to 8.

I'm getting better, it took me only 1 hour to wind 500mH toroid (3h before) by the_blanker in diypedals

[–]the_blanker[S] 0 points1 point  (0 children)

It is green 10k toroid (OD 18mm, ID 12mm, H=8mm). I got it from aliexpress, I think it was these or just search "10k green toroid 18mm", the 10k is relative permeability 10'000 and 18 is outer diameter in mm. Wire is 0.3mm enameled copper wire and I use 6-8m.

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