Almost every man has a mustache And when necessary to shave. When I was young, I used a razor because it’s cheap, but it’s not economical for daily use.
So I buy a philips Electric shaver, it cost 15$ for 20 years ago.
Figure 1 The philips Electric shaver.
Which does not need to change blades throughout a lifetime and easy to use , lightweight. But the need to change the two AA alkaline, about once a month. Or use rechargeable batteries I have to charge it about Once a week.
It is tricky and not saving.
Idea for modification.
So I think to adapted the AC adapter for use. Which I have 5V 2A power supply as Figure 2 an Italian friend take it to me. We cut terminal output away and then check the output voltage of 5.17-volts as Figure 3
Figure 2 The AC switching adapter.
Figure 3 measure output voltage of 5.17-volts
But this Electric shaver uses 3V DC power supply only.
However We can use it with 5 volts supply in short times. The DC motor in the Electric shaver is very loud. And we check current that flow through them of 0.39A as Figure 4.
Figure 4 measure its current at 5-volts supply
To long life of them (both Electric shaver and adapter), So I insert two the diodes-1N4007 in series between 5-volts power supply and Electric shaver. as Figure 5 Makes current flow through lower than before is 0.34A as Figure 6.
Figure 5 Block diagram connection two diode in series between them.
Figure 6 The current decrease when put 2 diode in series.
And measure voltage across the Electric shaver is reduced down to 3.1V which it is safe for them.
How to modified.
We solder two diode to terminal of battery holder inside the Electric shaver. as Figure 7 and connects the wires to its then use the shrink tubing as Figure 8.
Figure 8 solder two diode and connects the wires
Lastly, we have new our Electric shaver that saving my money and easy to use.(Figure 9)
Reduction the waste pollution from the batteries.
Figure 9 new our Electric shaver with adapter ready to use