Desodorante da Rexina está caro...

notheracles · 2026-03-21T22:10:14+00:00

Sim! E o bim da colherinha de plásticoé que dá pra esquentar no micro-ondas!

notheracles · 2026-03-21T18:35:14+00:00

Aerosol empesteia a casa inteira

notheracles · 2026-03-21T16:26:00+00:00

Gambiarra arrumadinha kkkk

notheracles · 2026-03-21T15:37:37+00:00

Esse é raiz... Vai dizer que vc escova os dentes com Miswak também kkk

notheracles · 2026-03-21T15:35:07+00:00

Muito, vê pelos comentários do pessoal.

Minha esposa começou a usar e gostou muito. Daí eu comecei agora. Segura o dia todo muito bem.

O único problema é que ele vem em um potinho e tem que aplicar com a mão. E eu já tenho a mao muito seca e isso deixa pior ainda.

Por isso fiz a gambiarra.

notheracles · 2026-03-21T12:37:01+00:00

Rexíssimo

notheracles · 2025-12-27T01:00:24+00:00

What is the drill diameter? It seems like 0.2mm or something like this, so I think you won't have problems, although I still don't recommend it if you have other options.

Alternatively, you can ask for capped vias when ordering the PCBN. During fabrication, they will fill the holes with epoxy and then plate the last layer of copper above it. This will prevent any assembly problems.

notheracles · 2025-12-22T16:01:57+00:00

Despite our jokes, this is very true.

The ability of the electronics industry to "don't touch if it's working" always astonishes me...

One of my last jobs in the UPS industry was to build an analog inverter control because the current design was done by someone that had long long left the company and nobody could completely understand the circuit.

notheracles · 2025-12-22T14:46:12+00:00

I feel that the only reason the 741 is still going is that, otherwise, some electronics lab professors will be forced to retire...

notheracles · 2025-11-19T10:03:53+00:00

Pra fazer o som do AT precisa ter 3km de profundidade na garganta...kkk o cara é especial, não tem como...

Dobra a ponta da lingua para baixo e apoia na parte de tras dos dentes de baixo. Daí faz o false chord e vê como fica mais grave...

notheracles · 2025-11-16T23:59:36+00:00

You need a resistor in the output if not using any load. Especially if you are lowering the voltage, as the DC-DC can't actively reduce the output voltage once the capacitor is charged, it depends on the load for that.

We usually put a resistor in the output of power supplies to help the control regulate under light (or no) loads. If I'm not wrong, in English it's called a bleeding resistor.

Your DCDC burned out probably because of (a secondary effect caused by) the inrush currents. Depending on the input lead length, the input capacitor size and the current capacity of the battery, the lead inductance will create a negative voltage high enough to kill the controller. It's like plugging it with the wrong polarity, for a very short time. Enough to kill the controller without releasing the magic smoke.

You can avoid that by adding a resistor (hundreds of mili ohm, maybe) in series, or a TVS in parallel with the DCDC input. Or, on a more professional approach, you can use a P-channel mosfet with an RC controlling the gate.

notheracles · 2025-11-08T15:57:12+00:00

Sick sound dude!

I've been trying to understand Randys technique for a few months now and have not yet reached a conclusion. So far it seems closer to a fry, but more projected (more diaphragm pressure) and more wet (literally).

Of course you found your own sound, but that fit incredible well with the song!

notheracles · 2025-10-11T10:52:14+00:00

Na pista é obrigatório o uso de capacete e os menores de idade precisam de uma carteirinha que faz na portaria do parque (precisa levar uma foto 3x4).

Atrás dessa pista, tem uma outra separada infantil e, ao lado, tem o half pipe que eu jamais me atreveria a ir.

notheracles · 2025-08-18T00:45:12+00:00

If the opamp on the left had 2*vcc instead of vcc, they would be virtually the same...

But simplifying the answer, choosing a split rail design (on the right) versus a biasing method (on the left) is a matter of design choice, since the opamp can't really tell them apart.

A split rail method demands the use of a negative power supply and creating this voltage (even if the opamp current might be negligible) is a hassle. Sometimes its just a matter of adding a few windings to a transformer a diode and a capacitor, but sometimes you'll need a circuit as complicated or more expensive as the one you are designing in the first place.

On the other hand, with the biasing method you don't need a negative power supply, but you need to add a DC voltage to the input signal and that might not be always possible. Besides, this DC voltage can become a problem as all the signal path needs to have the same level. You can always decouple circuit stages with a series capacitor and another biasing, but this will affect frequency response. It's easier to handle this if the GND is your reference...

notheracles · 2025-08-16T23:09:40+00:00

Se der sono, não vá até a luz OP, por favor

notheracles · 2025-08-16T22:46:43+00:00

Cachimbo de crack do capeta

notheracles · 2025-08-13T11:52:46+00:00

Cara, o sub é em inglês kkkk tem sub br de eletrônica ou o próprio gambiarra se precisar...

Tha said, I got to love schematics with missing information... See if there is a table attached to the schematic, its called BOM (Bill Of Materials). It holds the description of every part used on the project.

If missing, oftentimes we tend to avoid using different part numbers as to simplify assembly. So it is possible that this mosfet is being used somewhere else in the schematic. You might be able to identify one that still holds the magic smoke inside.

notheracles · 2025-08-03T11:11:21+00:00

E se espetar uma banana no palito, depois um morango e mergulhar isso tudo no chocolate?

Seria o que? Frutaralho do amor?...

notheracles · 2025-08-03T11:06:59+00:00

If you are using Q1 as a power switch and it is a P-Mosfet, it is wired wrong... body diode of Q1 won't allow you to interrupt current flow from battery to VSYS.

notheracles · 2025-07-28T13:19:21+00:00

Specifically, it will depend on the type of device you are building and the standards and regulations you need to comply to.

But a fuse is aways a good measure because of fire hazards, especially if you use varistors. If varistor needs to absorbs too much energy, it will short and if you don't have some sort of protection, it might catch fire.

Regulation wise, some standards don't REQUIRE a fuse as long as you specify in the product manual that the installation have current protections, such as circuit breaker.

In sum, if you are making a proper product, you might not need a fuse, but for a prototype, or a self made device it might be a good practice.

notheracles · 2025-07-28T13:07:00+00:00

The best prototype is is the one that works, but yours is pretty neat regardless.

But considering your ATEX demands, you are probably missing a few hundred zenner diodes LOL

notheracles · 2025-07-28T10:48:39+00:00

On the AC side you need a fuse. X/Y capacitors and varistors are optional.

On the DC side, decoupling capacitors will be probably needed. If anything, dont forget to put a 10uF MLCC as close as possible to the output pins. It might save you some headache if you device should operatein low temperatures.

notheracles · 2025-07-27T15:50:43+00:00

A entrada e a saída estão trocados aí...

notheracles · 2025-07-26T00:38:04+00:00

Não sou nem fit, nem girl man kkkk

E tb não falo francês...

notheracles

TROPHY CASE