Showing posts with label driver. Show all posts
Showing posts with label driver. Show all posts
Sunday, April 7, 2013
Surge Protected Cheap Transformerless Hi Watt LED Driver Circuit
This circuit is just a proof of concept just to show that the good old 555 timer can still be
used for a modern and quite demanding application. It is by no means an optimized circuit
that can be readily used for mass production. It appears relatively big by today's standard
because I used only through hole components. You may shrink it to 50 % of its original
size if you use modern SMD parts. You may also be able to increase the efficiency of this
circuit. Unfortunately I didnt't have time to do extensive measurements with all sorts of
inductors. There may be some room for optimizations.
Parts list
R1 2.2 kΩ / 0.1 W
R2 10 kΩ / 0.1 W
R3 100 kΩ / 0.1 W
R4 470 Ω / 0.1 W
R5 1 kΩ / 0.1 W
R6 2 Ω / 0.25W
C1 220 pF NPO ceramic disc capacitor
C2 10 µF / 16 V electrolytic
C3, C4 470 µF / 6.3 V, low ESR
L1 custom made transformer, see text
L2 47 µH / 2 A (TDK SLF 12575 / Fastron PIS4728 series)
D1 1N4148
D2 SB240 (SB360, MBRS240, MBRD650)
D3 BZX55C 4V7, 4.7 V Zener Diode
D4 1 W High Power LED
T1 BC 337-40 (2N2222A)
T2 BC547B (2N3904)
T3 2SK2869 (IRLR2905, IRLZ 34N)
IC1 ICM7555 (TLC555, HA17555)
Sunday, March 24, 2013
Video Line Driver
This circuit is a video line driver specifically intended for use with a single-ended power supply. As a matter of fact, the synchronised outputs of a line driver for composite-video signals go negative with respect to ground. In order to be able to process these negative signals in a circuit powered from a single-ended supply, it is necessary to AC-couple the input of the opamp as well as level-shift the signal in the positive direction.
Video Line Driver Circuit diagram:
The input is terminated into a 75 Ω resistor (R1). From here, the signal passes through AC-coupling capacitor C2 and is applied to potential divider R2-R3, which provides the necessary DC-offset. The shift into the positive direction amounts to +1.7 V, with the values shown in the schematic. To avoid any misunderstandings we should add that this value is fairly critical. Deviating from the values shown can lead to distortion in the complementary input stage of the opamp that has been used here, and this of course, has to be avoided.
Video Line Driver PCB-Layout :
Because we provided the circuit with its own voltage regulator circuit (IC2), just about any mains adapter will suffice for the power supply. The current consumption is less than 20 mA. The construction of the line driver using the accompanying printed circuit board layout is no more than a simple, routine job.
Parts List :
Resistors:
R1,R7 = 75Ω
R2...R4 = 4kΩ7
R5,R6 = 1kΩ
R1,R7 = 75Ω
R2...R4 = 4kΩ7
R5,R6 = 1kΩ
Capacitors:
C1,C4,C5,C7C10,C12 =
100nF
C2 = 47µF 16V radial
C3,C11 = 10µF 6 V radial
C6 = 220µF 6 V radial
C8 = 1000 µF 6V radial
C9 = 100µF 16V radial
C1,C4,C5,C7C10,C12 =
100nF
C2 = 47µF 16V radial
C3,C11 = 10µF 6 V radial
C6 = 220µF 6 V radial
C8 = 1000 µF 6V radial
C9 = 100µF 16V radial
Semiconductors:
D1 = 1N4001
IC1 = OPA353UA
IC2 = 78L05
D1 = 1N4001
IC1 = OPA353UA
IC2 = 78L05
Miscellaneous:
PC1-PC6 = PCB solder pin
Case, e.g., Hammond type
1590A
PC1-PC6 = PCB solder pin
Case, e.g., Hammond type
1590A
Copyright : Elektor
Source : http://www.ecircuitslab.com/2012/04/video-line-driver.html
Saturday, March 16, 2013
Dual Voice Coil Wiring Driver Stereo Integritycircuit Schematic
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Dual Voice Coil Wiring Driver By Stereo Integrity Circuit Schematic.
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