Circuit Cellar No.250 - May 2011
http://www.uploadstation.com/file/sbXjTHb/CircuitClr052011.pdf
http://www.fileserve.com/file/7Katdg8/CircuitClr052011.pdf
Switching Power Supply
Power Supply Unit is the electronic circuit used to provide energy for active components in electronic equipment. Certainly every electronic device using the Power Supply Unit.
Each active component in electronic equipment, require a different voltage and current, such as 5V, 3.3V, 12V etc. In carrying out their duties, this unit works very hard and usually result in excessive heat. This could damage the Power Supply Unit when you can not handle it correctly.
Most of the damage of electronic equipment located on the power supply unit. Actually it is not difficult to fix, if you know the correct procedures. Those experienced electronic repairers know that having the right procedure to troubleshoot and repair power supplies is the key.
Details How to fix Switch Mode Power Supply Here
Each active component in electronic equipment, require a different voltage and current, such as 5V, 3.3V, 12V etc. In carrying out their duties, this unit works very hard and usually result in excessive heat. This could damage the Power Supply Unit when you can not handle it correctly.
Most of the damage of electronic equipment located on the power supply unit. Actually it is not difficult to fix, if you know the correct procedures. Those experienced electronic repairers know that having the right procedure to troubleshoot and repair power supplies is the key.
Details How to fix Switch Mode Power Supply Here
Variable Power Supply 1.5V - 35V DC
IC = LM317 - P1 = 4,7KΩ - R = 120Ω
C1 = 100nF/63V - C2 = 1uF/35V - C3 = 10uF/35V - C4 = 2200uF/35V
D1-D4 = 1N4007
12V to19V Power Supply
R1 = 5k6
R2 = 51k (51k1)
R3 = 9k1 (9k1)
R4 = 1M
R5 = 4k7
R6,R8 = 15k
R7 = 27k
R9,R10 = 6,8
R11 = 10k
R12 = 100
P1 = 5k preset
Capacitors:
C1-C4 = 3300µF 16V, radial,
C5,C10 = 1µF MKT,
C12 = 1µF MKT,
C6-C9 = 2200µF 25V radial
C11 = 22nF,
C13 = 2nF2,
C14,C15 = 100nF ceramic,
C16 = 10µF 63V radial
Inductors:
L1 = 56µH, 21 turns 10 x 0.5 mm ECW, parallel
1 x ETD 29 braid forner,
2 x ETD 29 clamp,
2 x ETD 29 amount half, actual # N67, air gap 0.5mm,
Semiconductors:
D1 = MBR1645 (International Rectifier)
T1 = IRL2505 (International Rectifier) TO-220AB case,
T2 = BD139
T3 = BD140
IC1 = UC3843N (Texas Instruments)
Miscellaneous:
K1-K4 = 2-way burrow terminal, vertical, PCB mount
F1 = fuse, 10A/T (slow) 6.3 x 32 mm (¼ x 1¼ inch) +
2 agglutinate holders for 6.3 mm bore and PCB mounting
2 x heatsink blazon SK104-STC (or STS) TO220 38.1mm, 11K/W
Isolating washers for T1 and D1 (TO-220AB) + isolating bushes
FLIP-FLOP
R1 = R4 = 1 K
R2 = R3 = 100K
R2 = R3 = 100K
C1 = C2 = 10µF/16V
C1 = C2 = 10μF/16V
Q1 = Q2 = đèn C828 Q1 = Q2 = C828
Lamp Two LEDs
FM Transmitter
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