Here is a circuit diagram of the incoming call flash that can be used without a power supply , as shown in the right figure.
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The principle of this thing is the same as that of the previous ore radio, but the earphone is replaced by a light-emitting diode, and the ore used for detection becomes a UHF diode. It requires a relatively large power to illuminate the LED, so it is necessary to compare the antenna of the mobile phone. Only work.
The key component of this call flash is the UHF diode, which does not work if the cutoff frequency is not high enough. So the figure shows the 1SS108 (Schottky barrier diode for a variety of detection and high-speed switching), also with the switching diode IN4148. It is a pity that I only have the IN4007 for rectification on hand. The frequency does not go, So, I am not going to do this.
The inductor can be wound by itself or replaced by a spring. I saw that some products use springs, and the circuit is simpler, as shown below.
The thinner the enameled wire used in the coil, the more the number of turns, the greater the brightness of the LED. Right, high-brightness LEDs can be used to increase the brightness.
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