A very simple transformerless power supply electronic project which require few electronic components can be designed very simple using this circuit diagram .
We can observe that the U2 tension of this transformerless power supply circuit project it's equal with the zenner diode voltage and it's kept at this value such a long time than the output current .
We can calculate the value of components of these power supply circuit using these formulas .
I2=120C1(220-0.4U2).
C1=I2/1209220-0.4U2)
C1 in UF,I2 in mA ,u2 in V)
A simple solar charger circuit can be constructed using this circuit diagram .
The nominal voltage of the solar charger circuit module is determined by the number of battery cells to be charged. Because of the typical voltage drop of 0.3 to 0.4 V across Schottky diode D1, the nominal voltage should exceed the charge voltage set on P1 by about 0.3–0.4 V .
A 15V switching power supply circuit project can be constructed using the TOP204 switching controller integrated circuit manufactured by Power Integrations INC .
TOP204 switching power supply circuit diagram can be very useful for applications that don’t need a huge power .
The design of the switching power supply using the TOP204 IC is not so complicate , an require few external components , making it ideally for compact power sources .
