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Circuit Cellar No.250 - May 2011
http://www.uploadstation.com/file/sbXjTHb/CircuitClr052011.pdfhttp://www.fileserve.com/file/7Katdg8/CircuitClr052011....
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...
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 = 1N4...
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...
FLIP-FLOP
R1 = R4 = 1 KR2 = R3 = 100KR2 = R3 = 100KC1 = C2 = 10µF/16VC1 = C2 = 10μF/16VQ1 = Q2 = đèn C828 Q1 = Q2 = C828Lamp Two L...
FM Transmitter
Inductor L3 can be a VK220J type RFC. For L1 make 3 turns of 1mm enamelled copper wire on a 10mm diameter plastic former. On the same core make 2 turns of 1 mm enamelled copper wire close to L3 and that will be ...
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