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TCM5087 microcomputer dial integrated circuit

Published:2011/4/25 3:24:00 Author:TaoXi | Keyword: microcomputer, dial integrated

The TCM5087 microcomputer dial integrated circuit can be used in communication equipment as the Dual audio signal code generator. 1.Features The TCM5087 IC has the dial-up signal encode circuit, key switch signal translate and edit circuit, and the mute control circuit. 2.Pin functions and data The pin functions and data of the TCM5087 IC is as shown in table 1. (View)

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Circuit Of Flowerpot Water Alarm Composed of 555

Published:2011/4/25 19:13:00 Author:TaoXi | Keyword: Flowerpot, Water Alarm

Circuit Of Flowerpot Water Alarm Composed of 555
Circuit (View)

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Water full alarm circuit compose of 555

Published:2011/4/25 9:54:00 Author:TaoXi | Keyword: Water full alarm

Water full alarm circuit compose of 555
The water full alarm circuit is as shown. The core of this circuit is the multivibrator which is composed of 555 and R3、R4、C1. The oscillation frequency of this multivibrator is f=1.44/(R3+2R4)C1, frequency of the corresponding parameters is about 1kHz. When the water is full, A and B are in the short-circuit state, BG1 close and trig the oscillator start-up, pin-3 outputs the oscillation signal to drive the speaker Y, so we know the water is full. (View)

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Bus door-close automatic notification device (555、KD153、KD28) circuit

Published:2011/4/25 9:43:00 Author:TaoXi | Keyword: Bus, door-close, automatic notification device

Bus door-close automatic notification device (555、KD153、KD28) circuit
The Bus door close automatic notification device (555、KD153、KD28) circuit is as shown. This circuit is composed of monostable delay circuit, Ding-Dong IC KD-153, dual power amplifier integrated circuit KD-28 and the audio circuit (speaker). The monostable delay circuit is composed of the IC1(555) and R1, C1, R2, C2. When the micro switch K1, K2 is closing, voltage of C1 can not change, 555 reset the place because of the pin-2 is low-level (<1／3VDD), pin-3 outputs the high-level current to conduct BG1, so the KD-153 has power to work, the Ding-Dong signal is amplified by the KD-28 and then drives two speaker to send out voice. When C2's pin-6 has the electric potential of 2/3VDD, 555 resets. The speaker stop working. This period that the speaker send out sound is the monostable circuit delay's td = 1.1R2C2. Change the charge-time constant R2C2, we can adjust the sound of the time. (View)

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TC9316F digital tuning DTS integrated circuit

Published:2011/4/25 9:14:00 Author:TaoXi | Keyword: digital tuning, DTS

TC9316F digital tuning DTS integrated circuit
The TC9316F is produced by the Toshiba company, this device is one kind of DTS integrated circuits and is designed for the digital tuning radio, you can input the radio frequency directly, and it can presets 24 radio programs. 1.TC9316F circuit functions The built-in LCD driver of TC9136F can output 1/4 duty cycle, 1/3 bias, the repetition frequency is 125Hz drive pulse segment. It has PLL9lKHz, 10KHz reference frequencies and 75kHz, 15OKHz crystal oscillator to choice, the program controls the reference frequency, the command execute time is 80μS and 40μs. The PLL circuit includes the second division mathematical model's FM prescaler, the 4-bit frequency counter, 12-bit programmable divider, and the phase comparator.etc functions, and this circuit sets up a special 16-bit general-purpose IF counter. 2.TC9316F typical application circuit The TC9316F typical application circuit is shown as figure 1, use the keyboard matrix to set 19 operation keys. If we use the diode as the jumper, there are 32 operation keys to set. Figure 1. The TC9316F typical application circuit The TC9316F connected with the front circuit by 12 leads. (1)BO, B1 connected with the external decoder, it used to control the band selection, if one wave band has no channel, you should focus on checking this circuit. (2)OWER can be used to start the power, if there is no high-level signal sent out by the TC9316F, the radio circuit will not work. Table 1. The pin functions and data tables of the TC9316F IC (View)

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Dual display audio indicator circuit

Published:2011/4/25 3:39:00 Author:TaoXi | Keyword: Dual display, audio indicator

Dual display audio indicator circuit
This circuit indicates the audio frequency in the dual display mode, on one hand this circuit can drive a set of LED display in line. On the other hand, the changes of audio signal control these LEDs to change the brightness by six levels, the rhythm of brightness variation is changing with the audio signal. A set of LED uses these two kinds of display modes to get for better results. (View)

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Music tone generator circuit

Published:2011/4/25 8:46:00 Author:TaoXi | Keyword: Music tone, generator

The figure of the music tone generator circuit is as shown. This circuit is composed of five pieces of time base circuit NE555 and one piece of CD4017 decade counter, and this circuit can produce 10 different tones, every tone can be set by the preset potentiometer. In addition, the circuit can produce two effect-tones. (View)