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Left image:This is a wireless doorbell refit. You can see the green PCB in the left photo is doorbell PCB board. Now I changed the doorbell into a wireless remote switch. The additional yellow PCB board consist of regulator, CD4013 chip and SCR circuit.These two boards connected with each other via GND and trigger wire. power supply is two 1.5V batteries. |
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| Right image:My two frequency division sound box.Be carpenter first, then install the speaker unit and counting - down circuit,binding post, it's difficult to dug the hole of speaker, if have the professional tool of the carpenter that will be better. |
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This is a BA1404 FM-Transmiter.A special feature is Stereo. It has a steady frequency transmit because of a 38KHz crystal oscillatory,it's very nice and small. At last , I put the board into a small box and dug some holes in the front of the box. In the right photo, two big jack is 2 input audio channel,middle is Microphone input and the right is power supply jack. |
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TDA1521 BTL power amplifier consist of two TDA1521 aduio chip.My filter circuit has four 4700uF Electroanalysis capacitance.
The TDA1521/TDA1521Q is a dual hi-fi audio power amplifier encapsulated in a 9-lead plastic power package.
The device is especially designed for mains fed applications (e.g. stereo tv sound and stereo radio). Features:Requires very few external components, Input muted during power-on and off
(no switch-on or switch-off clicks), Low offset voltage between output and ground, Excellent gain balance between channels, Hi-fi according to IEC 268 and DIN 45500, Short-circuit-proof, Thermally protected.
When I DIY this amplifier, firstly designed the circuit diagram, then designed the PCB board and seal all component. At last, you can choose a beautiful crust, I chosed a blue one:) it's very nice for me. |
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The nucleus component of this frequency - modulation transmitter is a Max2606.The chip's size is very small, like grain of rice similar.The MAX2606 evaluation kits (EV kits) simplify evaluation of this family of voltage-controlled oscillators (VCOs). Max2606 Features:Easy Evaluation, Complete, Tunable VCO Test Board with Tank Circuit, Low Phase Noise, Fully Assembled and Tested. You can change the frequency by resistor, Frequency range from 88Mhz to 108MHz . If antenna impedance is 50 ohms, then output is -21db. The length of antenna is usually 75cm then valid distance is 50m. In order to assure the best reception result, it had better run parallel with receiving antenna to install. |
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This infrared remote control system circuit, mainly consist of CD4017 and SCR to control switch.The fabricant according to the operating current to chose SCR .Here, I use a 1.5A current SCR to control power supply. Infrared transmiter can be use the remote control or the other adversus of the TV set or VCD machine and permit of remote control. I use a Panasonic car infrared remote that in the left image, it's very thin and nice. The integrative infrared receiver has three pins , VCC , GND , DATA . When you press the key on your remoter, pin of "DATA" will ouput Corresponding waveform, it's Very convenient. |
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The general computer stay the infrared interface on the mainboard, but have no transmit and receive component.Thereupon, the user need to buy an infrared adapter.This type of adapter is expensive in the market.So this is not commonly accept by the large fancier, but its interior hardware cost is very cheap.You can do it by yourself, and the production is also very convenient.It can steer telecommunication with other infrared equipments, steer communication such as the cellular phone and the PC computer, can with double to deliver numerous informations, such as inner data,message and bell ring...etc..
You can see the image, My Nokia-8250 communication with PC computer via infrared system. |
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This is a smiliar low power amplifier. Nucleus component is TDA2822. The UTC TDA2822 is a monolithic integrated audio amplifier
in a 8-Pin plastic dual in line package. It is designed for
portable cassette players and radios. FEATURES: Wide operating supply voltage: Vcc=1.8V- 12V , Low crossover distortion , Low quiescent circuit current , Bridge/stereo configuration. |
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The numerical thermometer nucleus adoption AT89C2051 MCU chip, the temperature sensor is a MAX6577, measure temperature from -40 to +125.4 digital LCD to display the temperature.The MAX6577 are low-cost, low-current temperature
sensors with a single-wire output.
The MAX6577 converts the ambient temperature into a
square wave with a frequency proportional to absolute
temperature. The MAX6577 offers accuracy of ±3°C at +25°C, ±3.5°C at
+85°C, and ±4.5°C at +125°C.
It feature a single-wire output that minimizes
the number of pins necessary to interface with a microprocessor.
The period/frequency range of the output
square wave can be selected by hard-wiring the two
time-select pins (TS0, TS1) to either VDD or GND. The
MAX6577 are available in space-saving 6-pin
SOT23 packages. |
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