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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

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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

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Mono Audio Amplifier


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100watt Inverter















T1 can be a 9-0-9 V primary, 230V secondary, 150VA transformer


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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 L2.


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    20 watt Audio Amplifier


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    Switching Regulator 15V-6A




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    S-Video to Video Composite Converter





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