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Questions tagged [auto]

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The 7-segment LED display is too dark when connect to a auto dimming circuit

I'm using the below circuit to build a auto dimming circuit. I was fine when I only use one 7-segment led, but when I connect more 7-segment led (parallel to L1) the light intensity is very low. How ...
0
votes
4answers
7k views

Auto LED dimly lit when off

I bought an LED bulb, W5W, to replace the position lights, number plate lights and maybe the interior reading lamps. However they stay dimly lit when they're off. I am thinking that the current is ...
1
vote
0answers
172 views

USB Voltage auto selector (Prioritise VUSB)

I'm trying to design a auto voltage selector circuit to prioritise USB voltage when the USB is plugged in. The power goes through some voltage regulators which then powers a MCU (ATMEGA32U). I have ...
0
votes
1answer
151 views

Battery auto backup for GSM

I have a switching power supply that operates at 4V output. I want to have my GSM always powered when my primary voltage is removed. I use a simple Li-Ion battery 4.2V and I want to use it as backup ...