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Electronics tutorial about light sensors including photocells, LDR, photodiodes, phototransistors, photovoltaic cells, and light-dependent resistors. Light sensors are crucial components in various electronic applications, enabling devices to respond to changes in ambient light levels. This tutorial covers several types of...
This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of a flashing LED. The device must be placed a few centimeters...
The original FLED-based SE uses a flashing LED to drive a type 1 solar engine (you'll note that it's just like the Zener-based SE, but with a FLED in the starring role). The good news is that all the...
The Vx2SE is a simple discrete voltage-doubling SE for driving an LED. If the load is a red or green LED, J1 is used together with just one red or green LED for threshold detection (no 1381). For driving...
The circuit is designed to eliminate the vocal portion of an audio signal while preserving the instrumental portion. It achieves this by mixing two channels that are 180° out of phase, allowing the signals that create the center-stereo image...
The sun trucker employs three photoresistors, R7, R8, and R9, to enable the circuit to track the sun during daylight hours while ceasing operation at night. Additionally, the circuit can be duplicated to achieve movement along four axes by...
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