2, the integrated block TDA11105PS pin functions are as follows: (1) IFVO: video signal output. (2) VP2: TV processing circuit power supply 2. (3) VCC AUDIO: audio intermediate frequency processing circuit power supply. (4) PLLIF: Medium frequency PLL filter. (5) GND2: audio IF circuit grounding.
3, with TDA11105PS/V3/3/AG3 pin function (voltage) : full TV signal (47v); Video detection power supply (5v); Audio frequency discrimination power supply (55v); Synchronous detector foot (2.
4, first of all, measure whether the ten B voltage at the output end of the switching power supply circuit is normal. If the above is normal, then measure whether the b pole voltage of the tube has a normal negative 0.5v voltage, if there is no such voltage, it indicates that the line oscillation circuit, the lineNone of the push circuits are working, so take a closer look at the down-oscillating circuit elements.
0-310v HV high voltage start can be replaced by LD7576PS, change 1 pin 103 resistance to 472 capacitance.
LD7575 power supply chip is an adjustable voltage regulator used in switching power supply voltage controller. The chip has the characteristics of wide rated input voltage range and high efficiency, which can provide stable output power for a long timePress. The input voltage ranges from about 6V to 30V, and the output voltage ranges from 24V to more than 80V.
LD Taiwan Tongjia Level 1 agent LD7575PS LD7575PN is a current mode PWM controller with excellent energy saving operation. It has a high-voltage current source that provides starting current directly from a high-capacity capacitor and further provides a lossless starting circuit.
If it is determined to be a power supply problem. LD7575PS Voltage (1) 3v for each pin. (2) 7vv. (3) 0v. (4) 0v. (5) 5v.(6) 15v. (7) 0v. (8) 306v Check whether there is any problem with the starting resistance. It's usually 100K ohms.
V. If the 6-pin voltage is lower than 16V, it indicates that the starting voltage is too low, and the 6-pin external component C90LD7575 uses a resistor, while LD7576 uses a capacitor to connect to the ground.
The voltage instability of LD7575PS may be caused by a variety of reasons. First, check if there is a problem with the power supply, which may be caused by unstable input voltage or excessive power load. Second, check whether the components on the circuit board areThere is aging or damage, such as capacitors, diodes, or regulatory devices.
NE555 is an 8-pin time-base integrated circuit, the main functions of each pin (the integrated block figure is below) 1 ground GND 2 trigger 3 output 4 reset 5 control voltage 6 threshold (threshold) 7 Discharge 8 power supply voltage Vcc is widely used, can be installed in the following types of circuits: 1.
Only a simple resistor and capacitor can complete the specific oscillation delay effect. Its delay range is extremeWide range, from a few microseconds to a few hours.
The ne555 works as follows: A voltage is applied between the power supply and the ground. When pin 5 is suspended, the voltage comparator C1 has a voltage of 2VCC/3 at the in-phase input and a voltage of VCC/3 at the invert input of C2.
pin) and the external trigger voltage of the low trigger terminal TL (pin 2). The discharge end D (pin 7) is connected between R1 and R2. The voltage control terminal K (pin 5) is connected to the high-frequency interference bypass capacitor C2 (0.01uF) without external control voltage. Direct reset terminal R (pin 4) is connected to a high level, making NThe E555 is in non-reset state. Procedure
NE555 (P) is mostly an 8-pin package, the pin arrangement is shown in Figure 1, the logic block diagram is shown in Figure 2, and the logic table and function table are shown in Figure 3. There are also two NE555 packaged together, the model is called NE556.
Pin configuration Pin 1 (ground) - ground (or common ground), which is usually connected to the circuit common ground. Pin 2 (trigger point) - This pin is the time period that triggers NE555 to start it. Trigger signal upper edge voltage must be greater than 2/3 VCC, lower edgeMust be less than 1/3 VCC.
1, hello: -- ★TDA7375 is an automotive power amplifier circuit.
2, TDA7375 is a four-channel audio power amplifier circuit, mainly used in car audio, but also used in multi-channel home audio. A piece of TDA7375 can be easily formed into a four-channel surround sound field, and can also be connected into a two-channel BTL power amplifier and a 1-channel power amplifier circuit with TDA7375.
3The TDA7303 is an audio preconditioning integrated block with four input channels and one output channel. The following is a brief description of the TDA7303's 2-pin functions and typical circuits: 2-pin (IN1) : Input 1. Connect the audio signal source to this pin. Capacitive coupling is usually used to input the audio signal to this pin.
4, about the voltage of the tda7377 power amplifier circuit diagram, tda7377 power amplifier circuit diagram, many people do not know, today to answer the above questions for you, now let's take a look! Circuit for TDA7377, with 4 outputs,