Moritz Strohm (tech account)Charging old Nokia phones from the 2000s can be tricky without the original charger: Simply applying 5 Volts DC to the connector (positive inside, negative outside) is not enough. You need to provide a pulsed voltage similar to the original Nokia charger or the phone will not charge.
Luckily, a square wave from a NE555 timer and a mosfet will be enough to provide a pulsed voltage that the phone will accept. The frequency also does not have to be exactly 50 Hz. The phone will also charge with a slightly higher frequency (56-57 Hz in my example).
Although this circuit might come 20 years too late, it still enables you to charge those old phones with any power supply that can output 5V DC.
#DIY #Retro #Nokia #Cellphone #Charger #PhoneCharger #Electronics #NE555
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