Published:2011/9/13 2:28:00 Author:Rebekka | Keyword: bus control display drive
TD6301 is an I (2) C bus control display drive integrated circuit. It is widely used in low-voltage high-grade players and other audio equipment, car audio. TD6301 IC contains 3 groups of 7-segment display drive circuits and the input state selection circuit. The IC uses 28-pin plastic dual in-line structure, the IC 5 pin functions and data arelisted in Table 2. The pin functions and data of TD630lAP IC are shown in table.
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Published:2011/8/22 3:26:00 Author:Jessie | Keyword: Panasonic , VCR system , modification circuit
Panasonic NV-450 VCR system modification circuit diagram is shown as the chart. TA7673P is a special radio frequency modulation integrated circuit, and its sound carrier frequency is 5.5 MHz. T1 and Cllare connected tothe pin 4andpin5 of rf modulation integrated circuits, which can determine the oscillation frequencyof voices. Therefore, the method ofchanging sound carrier frequency from 5.5 MHz to 6.5 MHz is: change C11 of LC resonant circuit from 47p to 27p, then connect VCR with television, let video replay a box of good video, then watch videos as side trimming the magnetic cores of Tl to make the sound best. (View)
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Published:2011/4/14 6:52:00 Author:may | Keyword: Electronic transformer, dependable performance
The circuit can steady work to consult the circuit diagram with no changes. Output voltage is 11V-13V, output current is 6A, working frequency is 60kHz. It can change working frequency by changing the numerical value of C3, C4, R1, R2. Its no-load current is very small.
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Published:2011/4/14 6:52:00 Author:may | Keyword: Parallel push-pull, voltage changer
This circuit adopts two capacitors with 100μF to make up man-made star point. When shutting off, this circuit can prevent transistor from destroying by high back voltage. Using regulation resistance with 50Ω can adjust the turn on level of transistor. The usage of 0.1μF capacitor is toincrease thespeed of on-off.
The data of transformer:
Winding np= 160turns, 0.5mm copper lacquered wire
nr= 13turns, 0.2mm copper lacquered wire
ng= 1300turns, 0.15mm copper lacquered wire
The transistor in parallel push-pull transformer should have the ability of high withstand collector-emitter back voltage.
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Published:2011/4/14 6:50:00 Author:may | Keyword: Voltage changer, blocking oscillator
This circuit is mutual coupling by three windings of blocking oscillator transformer. This let two transistors in turns tocontrol and turn on. Each pulse can change the state of transformer, because two transistors cut off in a short time, and, later the transistor which is cutting off before is turn on because the voltage of transformer is reversing. The duration of two half-wave is the same. This time depends on the parameter of RC link. The oscillation frequency can easily adjust from 50Hz to 1kHz.
Data of transformer Tr1:
Wing n1= 100turns, 0.5mm copper enameled wire
n2= 90turns, 0.5mm copper enameled wire
n1= 150turns, 0.5mm copper enameled wire
Data of transformer Tr2:
Wing na= 25turns, 1.9mm copper enameled wire (double wrap)
nr= 20turns, 0.43mm copper enameled wire (double wrap)
na= 1160turns, 0.43mm copper enameled wire (View)
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Published:2011/4/14 6:48:00 Author:may | Keyword: Switching supply, driving transformer
The introduction of winding coiling of high frequency transformer (switching supply driving transformer)
Switching supply driving transformer EE-18
We can choose EE-18 magnetic core or the assorted skeleton of EI-18.
One can put N1 and others winding in insulating barrier,
N2, N3 double winding along with N4, N5.
N2, N3, and N4, N5 is in insulating barrier. (View)
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Published:2011/10/14 1:44:00 Author:Ecco | Keyword: Single-stage , multi-channel input, coupling resistor
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Published:2011/10/16 21:57:00 Author:Ecco | Keyword: application circuit
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Published:2011/10/16 22:26:00 Author:Ecco | Keyword: logic frame
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Published:2011/10/16 22:25:00 Author:Ecco | Keyword: application circuit
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Published:2011/10/14 1:39:00 Author:Ecco | Keyword: Low-impedance input, tube
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Published:2011/10/14 1:52:00 Author:Ecco | Keyword: Multi-channel, audio input mixing
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Published:2011/10/14 1:50:00 Author:Ecco | Keyword: Common-anode loaded inverter
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Published:2011/10/14 1:42:00 Author:Ecco | Keyword: shape, common potentiometer
a). b): potentiometer with switch
c): Slide potentiometer
d): asynchronous different double-axis potentiometer
e): locking-type potentiometer (View)
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Published:2011/10/14 2:03:00 Author:Ecco
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Published:2011/10/14 2:03:00 Author:Ecco | Keyword: IC
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Published:2011/10/14 2:14:00 Author:Ecco | Keyword: super enhanced video
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Published:2011/10/14 2:17:00 Author:Ecco | Keyword: Common-mode filter
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Published:2011/10/16 21:46:00 Author:Ecco | Keyword: 555 , touching desk lamp
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Published:2011/10/14 3:13:00 Author:Ecco | Keyword: three-phase asynchronous, motor controller
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