Wiring Schematic Diagram

This circuit inverter converts 12V DC battery to AC 22oV as the replacement of home energy. The inverter can be used for small electronic devices such as lamps, radio, phone charger, disc player, etc.

The inverter circuit is a central component, the CMOS 4047, and converts a DC voltage of 12 V to 220 V AC voltage. 4047 is used as an astable multivibrator. The pin 10 and 11 we find a symmetrical rectangular signal is amplified by Darlington transistors T1 and T2 trailer, and finally reaches the secondary coil of a transformer of the network (2 x 10V/100VA). Primary coil voltage is 220 AC voltage terminals. For best performance, use a toroidal core transformer with low losses. P1 to the output frequency can be regulated within certain limits (50 ... 400 Hz).

This is a circuit of a microcontroller AT89S52 thermometer and LTC1298 12-bit ADC, programs written in C language program with digital filtering and interface the LED display. Reading provides a sensitivity 0.1C.

The hardware block and circuit diagram is shown in the figure below. The thermistor sensor is epoxy. The signal conditioning circuit is a simple voltage divider. The ADC is 12-bit SPI interface LTC1298 analog to digital. Atmel's Microcontroller 89S52. The 0.5 inch display has four digits of 7 segments. The driver of the segment offers 32-bit CMOS output.

The 12-bit ADC (LTC1298 or MC3202) are two channels, CH0 and CH1. The signal from ADC input channel 0 thermistor voltage divider is simple. Channel 1 is available for other sensors. The example shown in the diagram is the HIH-3160 Honeywell Relative Humidity Sensor. The ADC chip interconnects with MCU 89S52 with P1.1, P1.2 and P1.3. The LED display has 4 digits. The CMOS shift register 4094 directly drives the LED

This is a FM transmitter circuit with semiconductor Maxim MAX2606 IC. In the circuit of rated frequency is 100 MHz for L1 inductor (390nH). Signals from the left and right channels of audio from its origin are added by R3 and R4, and attenuated by R2 POT. R2 can be used as a volume control. POT R1 can be used to select a transmission channel between 88MHz and 80 cm cable 108Mhz.Use long as the antenna.

Note:
* Use a battery for powering the circuit.It will reduce noise.
* An FM antenna from a old radio is a better option than the wire antenna.

IC MAX2606 Description

The MAX2605, MAX2609 are compact, high performance intermediate frequency (IF) voltage-controlled oscillator (VCO) designed specifically for demanding portable wireless communication systems. They combine monolithic construction with low noise, low operating power consumption of a small 6-pin SOT23 package.

Low-noise VCO, a feature on-chip varactor and feedback capacitors that eliminate the need for external adjustment elements, so the ideal MAX2605, MAX2609 for portable systems. Only an external coil is needed to establish the frequency of oscillation. In addition, a buffer integrated differential output is provided for driving a mixer or prescaler. The output buffer is capable of providing up-8dBm (differential) with a simple power game. It also provides isolation from load impedance variations.

The MAX2605, MAX2609 operate from a single 2.7 V to 5.5 V supply and provides low power consumption. IF these oscillators can cover the frequency range of 45MHz to 650MHz.

IC MAX2606 Absolute Maximum Rating

• VCC to GND..............................................................-0.3V to +6V
• IND to GND ................................................-0.6V to (VCC + 0.3V)
• TUNE to GND .............................................-0.3V to (VCC + 0.3V)
• OUT+, OUT- to GND ..................................-0.3V to (VCC + 0.6V)
• Continuous Power Dissipation (TA = +85°C)
• 6-Pin SOT23 (derate 8.7mW/°C above +70°C)...........696mW
• Operating Temperature Range ...........................-40°C to +85°C
• Junction Temperature......................................................+150°C
• Storage Temperature Range .............................-65°C to +150°C
• Lead Temperature (soldering, 10s) .................................+300°C

This is an audio amplifier circuit provides power to 1000 watts Blazer. This interesting routes under a lot of good and lively treble. Importantly, you should choose the power source, which has been quite high voltage class GND-70V 70Vdc 10A is the current low level

The transistors are 2SC3858 (NPN) and 2SA1494 (PNP) and the bandwidth characteristic of high, excellent area of ​​safe operation, high linearity and high gain. 2SC5200 driver transistors (NPN) and 2SA1943 (PNP). All devices are rated at 230 V, with the power transistors has a dissipation of 150 W and the drivers are 50W.

This circuit describes a process amplifier, power supply and the tests that are inherently dangerous. Nothing described in this article should not even be considered unless a wealth of experience, we know exactly what you are doing and are willing to assume full responsibility for 100% of what you do. There are design issues that may require analysis, fault detection and / or modification.

This circuit can help you by keeping the mosquito and similar Insects and other creatures away from you using a high frequency sound produced by this circuit.

The main principle in the which this electronic mosquito repellent works Is that mosquito and Insects are highly sensitive to some frequency of sound and They Do not like the sound. And Insects and mosquito Will leave or get away from you due to the annoying sound. But the sound it produces is of a high frequency of the which can not be Heard by Humans so you will not be affected by the sound.

In the circuit timer IC 555 is used as it generates an oscillator frequency of about 62 KHz, the working frequency of the circuit can be set by rotating the preset resistor R2, and the speaker converts the electronic frequency to sound frequency. Try to keep the frequency of the sound as high as possible. And Make sure you do not Hear the sound of this circuit by keeping it above 20 KHZ, the annoying sound Will be Heard by Insects but not by you Because Humans do not normally Hear the sound of higher frequency than 20 KHz.

for better results use a speaker of good quality in the circuit, using good quality speaker Will Ensure That Will the project work.