[ENGN2211 Home]

Specifications

Your design is to meet the specifications in Table 8.

 

Table 8: Power supply specs.

tx input voltage	240 V(rms), 50 Hz
output voltage at full load	14 V(DC), $\pm10\%$
full load current	500 mA(DC)
maximum ripple at full load	$20\%$

 

Your circuit can be built from the components listed in Table 9.

 

Table 9: Power supply components.

tx secondary voltages	6, 8, 10, 12,15 V AC(rms), $\pm10\%$
tx secondary currents	0.1, 0.25, 0.5, 1.0 A AC(rms), max
fuses	50, 63, 100, 200, 500 mA
diode	1N4001
resistor values	1, 1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 3.9,
	4.7, 5.6, 6.8, 8.2, 10 Ohms $\pm10\%$ and decade multiples
resistor power ratings	0.25, 0.5, 1, 2, 5, 10 watts max
capacitor values	1, 1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 3.9,
	4.7, 5.6, 6.8, 8.2, 10 $\mu$F, $\pm10\%$ and decade multiples
capacitor voltage ratings	16, 25, 63, 100 V DC max

 

Assume a safety factor of $50\%$ in determining transformer current rating, diode rating, power rating of resistors and voltage rating of capacitors.

Data sheet values for the 1N4001 diode you will use are given in Table 10 (in practice you would have to select this).

 

Table 10: Diode data sheet.

1N4001
parameter	symbol	value
max forward surge current	IFSM	30 A
max peak reverse voltage	VRPM	50 V
max ave value of full wave rectified current (120 Hz)	I0	1 A
max DC reverse voltage	VR	50 V

 

[ENGN2211 Home]