12V power supplies (or 12VDC power supplies) are one of the most common power supplies in use today. In general, a 12VDC output is obtained from a 120VAC or 240VAC input using a combination of transformers, diodes and transistors. What … Continue reading →

Here’s what you need in order to use the Roku Stick to get TV in your Van or Car: Roku Streaming Stick. HDMI to RCA Converter Adapter. Fast USB Car Charger Adapter. How do I use Roku when traveling? If … Continue reading →

Basic Battery Charging Methods Constant Voltage. Constant Current. Taper Current. Pulsed Charge. Burp Charging. IUI Charging. Trickle Charge. Float Charge. What are the methods of charging batteries? There are three common methods of charging a battery; constant voltage, constant current … Continue reading →

You cannot safely power most LEDs with a 3.3V source when the source can supply more current than the LED’s capacity. Two characteristics of the LED need to be known to calculate the resistor. If the current output of the … Continue reading →

The phone was misreading the battery life left on that charge, thus giving you a false battery percentage reading when it was really on a much lower battery percentage. Why does my phone turn off at 50 percent? There are … Continue reading →

With a digital meter that auto-senses polarity, you will get a negative accurate reading if you have a DC setting and measure DC with the polarity reversed. It will show zero or an error if the polarity is reversed and … Continue reading →

A power converter’s efficiency (AC-DC or DC-DC) is determined by comparing its input power to its output power. More precisely, the efficiency of the converter is calculated by dividing the output power (Pout) by its input power (Pin). What is … Continue reading →

An Apple 12v charger may be OK, as long as it doesn’t make it hot. But steer clear of 3rd party cheap chargers. They could damage the battery and shorten life. An Apple 12v charger may be OK, as long … Continue reading →

Adapters will allow you to interchange the plugs, depending upon the outlets in various countries; however, they do NOT change the electrical voltage. We highly suggest taking a variety of adapters when traveling because of how many different shaped plugs … Continue reading →

So it will charge in 110V input and at same rate. However if the charger is designed to operate only in 220V, it will not charge your battery at all. A good charger operating at 220V will not have any … Continue reading →

Conclusion. Whether you go with Corsair or EVGA, you’ll get a quality power supply with a great warranty. In general, EVGA’s power supplies are slightly more efficient and compact in size. On Corsair’s side, many of their PSU’s including the … Continue reading →

For example, USB Type-C alone can support up to 5 volts at 3 amps (15 W), while USB Type-C with USB PD allows the ecosystem to support several power levels up to a maximum of 20 volts at 5 amps … Continue reading →

The Dell jack did not fit into the Lenovo socket. While you work on such power supplies, even if this is low voltage dc, there is high current. Shortening the dc jack may lead to demage of the power supply … Continue reading →

Nothing will happen. Both 5V are typically connected to each other anyway as they branch of the same 5V regulator of some sort. Need 2 500mA usb ports? Use a 1A 5V regulator. What happens if you plug a USB … Continue reading →

Nope. The simple reason is this: a battery being charged is subject to a voltage higher than that of the battery’s voltage. That’s basically why the current flows from charging circuit into the battery, rather than vice-versa. If you put … Continue reading →