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Arduino USB Protection

Should I wire the power supply to the LED strip directly or should I use the power jack on the Arduino UNO directly? You should wire it directly to the LED strip. The LED strip and the power supply ...
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What does T designator means in PCB?

Likely a TVS diode, since it is a protection component on USB data lines.
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Shorting the USBLC6 ESD protection pins

Yes, that strategy will negatively affect ESD protection. The equivalent pspice model shows this: There is an impedance on both sides of the data lines (likely caused by the package leads and bonding ...
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Type C to type C USB2.0

USB2-only Type-C to Type-C cable is normative (Table 3-11, p. 76 of USB Type-C cable and Connector Specification 2.0). It requires 5 wires (GND, VBUS, D+, D-, CC) plus shield. Connectors you are ...
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TUSB2036 hub IC: only mouse and keyboard work at downstream ports

The datasheet qualifies the TUSB2036 as "full speed" hub, which is USB 1.1 (1.2 MBit/s) There is no bug in your circuit and no software will make a high speed hub out of it. It is just doing ...
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2 votes

How to get more current from laptop usb 3 port

USB 3.0 standard says it can provide up to 4.5W (0.9A@5V) of current, with dedicated downstream charging USB 3.0 ports providing maximum 1500mA (7.5W). 5V/2A is simply not possible. The internal ...
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Routing USB signal on RP2040

For USB FS stubs of an inch length – what you seem to be showing – it doesn’t matter much what you do in terms of impedance. Just route the traces close together over a ground plane and all is good.
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Esp32 Dev Board fails to communicate with external power source

I'm not sure if you can do it like that. Depending on your hardware the USB controller senses VBUS and this might be disabled by a diode. Here is a schemtic of a ESP32_DevKitc_V4. If you need to ...
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Routing USB signal on RP2040

USB connectors are compatible. If you use USB 3.0 but use only USB 2.0 pins, it is equivalent to plugging a USB 3 device to USB 2 socket, or plugging USB 2 device to USB 3 socket. "Best" ...
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Reducing USB output to 6v, 2w

If your strip of LED lights plugs directly into the battery pack and you can't see any circuitry between the battery pack and the LEDs you're probably safe to plug them directly into the USB 5V line. ...
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2 votes

USB transfer speed vs charging power

The e-marker chip is just that: a marker. It can mark many different things, and 5A current carrying capability is just one of the things it can mark. It doesn't have to. For example, I've been ...
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Using a 5V voltage regulator with a 5V input

the professor stated that, even if the input will be the same as the output, one should normally use a voltage regulator regardless. Nope. A linear voltage regulator can't produce an output voltage ...
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Using a 5V voltage regulator with a 5V input

You can't get 5V outof a linear regulator supplied with 5V. There is always a voltage difference between input and output for a linear regulator. The AMS1117 you specify in your schematic requires a ...
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ATMega32u4 minimum system clock for USB 2.0

The USB module needs a 48MHz clock. This is generated by a PLL circuit. The input frequency for the PLL typically is 8 MHz or 16 MHz, but other relations can be configured. You don't need an external ...
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Can I charge a 3.7V 150mAh LiPo battery from USB?

First, as people already noted, your "USB port" or "USB charger" are not Li-ion chargers, they are constant-voltage (5V) power supplies, maybe with some limitations. Your MP3 ...
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4 votes

Repair USB on ASUS router

Dr. Leonard (Bones) McCoy announces his verdict in a mournful voice: "It's dead, Jim." The brown colored areas are where traces used to be on the circuit board. The copper has been ripped ...
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2 votes

Can I charge a 3.7V 150mAh LiPo battery from USB?

They had 150-190 mAh Li-Ion batteries. All I can find are Li-Po replacements. What you call "Li-Po" IS a Li-ion cell. It's a pouch Li-ion cell, but a Li-ion cell nonetheless. Can I charge ...
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Stereo I2S To USB Audio

Sound card CMI6206 supports 2 microphones for about $20.
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Altium Designer - Net has only one pin | Pin out of grid | Floating Label | Diferential Pair

The first error means that the Net Label is not hooked to a wire. This could happen because, by using a grid other than the one that defines pin and wires spacing, you have misplaced the net label. ...
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why did my powered usb hub kill my computer's usb port?

You killed two USB-Ports on your computer. Why? I don't know, why you did it (I'd be really interested in your reasoning to do it) but I can tell you how you killed it. If you look at USB-Connectors ...
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FTDI FT232RL on custom PCB works only when warm

In addition to pull downs and pullups (always check and use them, don't let the device configure itself in a state you won't know) Make sure you also check the soldering on the chip. Thermal expansion ...
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3 votes
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FTDI FT232RL on custom PCB works only when warm

You forgot to connect the TEST pin to GND. It's always a good start to compare your schematics to the configuration specified by the datasheet. Source: Datasheet ...
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