The APR9600 is a voice integrated circuit that uses analog storage technology, power-off storage, and repeated recording and playback. The recording time is longer, up to 60 seconds. The price is cheap, so it is one of the commonly used quotations in the circuit. The circuit below is designed for automatic reproduction of two segments of sound. The integrated circuit used in Figure 1 is in addition to the playback master IIC, the recording chip IC1, the electronic switch IC6 and the audio amplifier IC8. There are also IC3 four-input and gate CD4081, IC4 four-input NAND gate CD4011, IC5 binary counting splitter. The core of the CD4022 and IC7 time base circuit ICM75550 control circuit is IC5. Power up lC5 can automatically clear the church, (2) foot YO output high level, the other output pins are low level. In the future work, IC5 count is increased by 1, (1) pin Y1 outputs high level, control IC2 puts the first segment, IC1 records the first segment; counter adds 1, (3) pin Y2 output level, control IC1 puts The first segment; the counter is incremented by 1, (7) the foot Y3 outputs the fast level, the control IC2 puts the second segment, the IC1 records the second segment; the counter is incremented by 1, the (11) pin Y4 outputs the high level, and the control IC1 is placed. The second paragraph. The control principle will be described in detail below. After power-on, the 5 volt power supply sends a high-level clear signal to the (15) pin of IC5 through C15. The count value of IC5 is cleared to zero! Only the (2) pin YO output is high. The time base circuit IC7 is monostable, and the delay time is determined by R21 and Cl9, which is about 1 second. The (2) pin of IC7 is a monostable trigger. After power-on, the pin is low, so the monostable is triggered. (3) The pin outputs a positive pulse of about 1 second after power-on, and is sent to the (13) pin of IC5. The trailing edge of this positive pulse increments the IC5 count by one. It can be seen that IC7 is equivalent to a start switch. IC5 is started after 1 second of power-on. When the IC5 count is incremented by one, the state of the output pin is changed from (2) pin YO to high level (1) pin Y1 is high level. The transition pulse of YO from high level to low level is triggered by C1O to trigger (1) of IC2, so that IC2 enters the playback state of the first stage of playback. At the same time, the (10) pin of IC2 changes from high level to low level, and controls the (11) pin of the electronic switch IC6 to make the output of the (14) pin of IC6 become high level. In fact, the (11)~(14) pins of IC6 form the inverter circuit of the ICSY (10) pin BUSY signal. The high level of the IC6 (14) pin is sent to the (13) pin of the NAND gate IC4. At this time, the (12) pin of IC4 is already at the quotient level, so the (11) pin of IC4 goes low. This low level is sent to the (6) pin of the AND gate IC3, and the (4) pin of IC3 is turned to the low level, and the tone status indicator D6 is illuminated. At the same time, the (27) pin of IC1 goes low, and IC1 enters the recording state. The (9) and (10) feet of the electronic switch IC6 also go low. The source signal for selecting the IC1 (20) foot is taken from Rl7, that is, the playback signal of IC2; the input signal of the audio amplifier IC8 is selected from The playback signal of the IC2 (14) pin. The low level of IC4 (11) pin output is also sent to the (13) pin of the AND gate IC3, so that the (11) pin of IC3 goes low and is sent to the (1) pin of IC1, triggering IC1 to enter the first The recording status of the segment. After IC1 enters the recording state, its (10) pin BUSY changes from high level to low level. When the first segment of IC2 is discharged, the IC2 (10) pin changes from low level to high level. After the electronic switch IC6 is inverted, the (13) pin of the NAND gate IC4 becomes a low level, the (11) pin of the IC4 becomes a high level, and the (4) pin of the AND gate IC3 becomes a high level, and the recording instruction Lamp D6 is off. At the same time, the (13) and (11) pins of lC3 become high level, and the (1) pin of IC1 becomes high level, so that the first recording of IC1 ends. At this time, the (10) pin of IC1 changes from low level to high level. This trip voltage is sent to the (14) pin of IC5, so that the IC5 count is incremented by 1. The output state is changed from (1) pin Y1 high level. Output high level for (3) pin Y2. The high level signal of IC5(3) pin is delayed by R7 and C9 (delay time is about 1 second), and sent to (5) and (6) of NAND gate IC4 to make (4) of IC4 Goes low. The (2) and (3) feet of the AND gate IC3 also go low, and the playback indicator D5 lights up. At the same time, the jump signal of the (4) pin of IC4 from high level to low level is coupled to the (12) pin of the AND gate IC3 via C7 coupling, so that the pin has a low level pulse input, IC3 (11) The foot also has a low level pulse output. This low level pulse triggers the (1) pin of IC1, causing IC1 to enter the playback state of the first segment. At this time, the (9) and (10) feet of the electronic switch IC6 are already at a high level. The playback signal of IC1 is sent back to the (20) pin of IC1 via the (3) and (4) pins of the electronic switch IC6, amplified by the (14) pin of IC1, and then electronically switched. The (1) and (15) pins of IC6 are sent to the (3) pin of the audio power amplifier IC8. The speaker emits the sound of the IC1 copy to check the effect of the copy. When the IC1 plays, its (10) pin output level has changed from high level to low level. After the first stage of IC1 playback is completed, its (10) pin changes from low level to high level again. This hopping signal triggers IC5 again, which increases the IC5 count by one. The output state of IC5 is changed from (3) pin Y2 high level to (7) pin Y3 is high level. The jump signal of IC5(3) pin Y2 from high level to low level is sent to the (2) pin of IC2 via C11, and IC2 is triggered to enter the playback state of the == segment. The whole machine enters the second section of IC2, and IC1 records the working state of the second section. Its working principle is similar to that of the first paragraph of the release and recording. After the second segment is placed and recorded, the IC1 (10) pin changes from low level to high level, and IC5 count is incremented by 1. The IC5 output is changed from (7) pin Y3 high level to (11) pin. Y4 is high. The high level of Y4 is delayed by R6 and C8, the NAND gate IC4(1) to (3) are inverted, and the gate IC3(1) to (3) are output, and then the (2) pin of IC1 is triggered. IC1 enters the playback state of the second segment, and the control principle is the same as that of the first segment. After the second stage of playback is completed, IC5 will become (4) pin Y5 output high level. Since the IC5(4) pin in this circuit is connected to the (15) pin via D1O, the high level of Y5 will make IC5 clear, so that IC5 becomes only the state of (2) pin YO output high level. So far, the system of the first segment, the playback of the first segment, the copy of the second segment, and the playback of the second segment have all been automatically completed. The indicators DO~D4 set in the circuit are used to observe the counting state of IC5 during debugging. In the figure, only the delay of 7, C9 and the delay of R6 and C8 are indispensable, otherwise the circuit can not work continuously automatically. PLC, that is, planar optical waveguide, that is to say, the optical waveguide is located in a plane. Optical Fiber, ABS BOX PLC splitter, Steel Tube Splitter Shenzhen GL-COM Technology CO.,LTD. , https://www.szglcom.com
As everyone is familiar with single-layer circuit boards, all circuits are located in a plane of the substrate. Therefore, PLC is a kind of technology, it does not refer to a certain type of product, let alone a splitter! Our most common PLC splitter is made of silicon dioxide (SiO2). In fact, PLC technology involves a wide range of materials, such as glass/silicon dioxide (Quartz/Silica/SiO2), lithium niobate (LiNbO3), III-V semiconductor compounds (such as InP, GaAs, etc.), silicon-on-insulator (SOI/SIMOX), silicon oxynitride (SiON), polymer, etc.
Devices based on planar optical waveguide technology solutions include: Splitter, Star coupler, Variable Optical Attenuator (VOA), Optical switch, Optical comb ( Interleaver) and Array Waveguide Grating (AWG), etc. According to the requirements of different applications (such as response time, ambient temperature, etc.), these devices can be made by choosing different material systems and processing techniques. It is worth mentioning that these devices are all optical passive devices and are independent. They can be combined with each other or with other active devices to form high-end devices with different functions.