Manual Reference

Here is a simple non-contact AC power monitor for home appliances and laboratory equipment that should remain continuously switched-on. A fuse failure or power breakdown in the equipment going unnoticed may cause irreparable loss. The monitor sounds an alarm on detecting power failure to the equipment. The circuit is built around CMOS IC CD4011 utilising only a few components. NAND gates N1 and N2 of the IC are wired as an oscillator that drives a piezobuzzer directly. Resistors R2 and R3 and capacitor C2 are the oscillator components. The amplifier comprising transistors T1 and T2 disables the oscillator when mains power is available. In the standby mode, the base of T1 picks up 50Hz mains hum during the positive half cycles of AC and T1 conducts.

Circuit diagram:

   

Non-Contact Power Monitor circuit diagram  

This provides base current to T2 and it also conducts, pulling the collector to ground potential. As the collectors of T1 and T2 are connected to pin 2 of NAND gate N1 of the oscillator, the oscillator gets disabled when the transistors conduct. Capacitor C1 prevents rise of the collector voltage of T2 again during the negative half cycles. When the power fails, the electrical field around the equipment’s wiring ceases and T1 and T2 turn off. Capacitor C1 starts charging via R1 and preset VR and when it gets sufficiently charged, the oscillator is enabled and the piezobuzzer produces a shrill tone. Resistor R1 protects T2 from short circuit if VR is adjusted to zero resistance.

The circuit can be easily assembled on a perforated/breadboard. Use a small plastic case to enclose the circuit and a telescopic antenna as aerial. A 9V battery can be used to power the circuit. Since the circuit draws only a few microamperes current in the standby mode, the battery will last several months. After assembling the circuit, take the aerial near the mains cable and adjust VR until the alarm stops to indicate the standby mode. The circuit can be placed on the equipment to be monitored close to the mains cable.

The extremely reduced components count allows very compact sets. The on-board clipping detector simplifies gain compression operations. The fault diagnostics makes it possible to detect mistakes during Car- Radio assembly and wiring in the car.

Absolute maximum ratings of IC TDA7295 IC

•     Operating supply voltage = 18 V
•     DC supply voltage = 28 V
•     Peak supply voltage (t = 50 ms) = 50 V
•     Output peak current Repetitive (duty cycle 10 % at f = 10 Hz) = 3 A
•     Output peak current Non repetitive (t = 100 µs) = 4A
•     Power dissipation, (Tcase = 70 °C) = 80 W
•     Junction temperature = 150 °C
•     Storage temperature = -40 to 150 °C

Before beginning a hatch, you need to regulate the incubator tempera- ture. Turn the control knob fully clockwise. The red indicator light will come on and the element will begin to heat. Watch the thermometer as the incubator heats up. As soon as it registers to the temperature recom- mended for the species you are hatching, turn the control knob slowly. Adjust the control knob counter clockwise to decrease heat and clock- wise to increase heat until you have it regulated to hold at the desired temperature. The red indicator light may flicker off and on during this process.

This is normal and indicates that the incubator is adjusting to changes in both internal and external air temperatures. Run the incubator for 6-8 hours. At the end of this time, make sure the desired temperature was maintained. If so, you are ready to incubate!

Disassembly: Place complete Automatic Egg Turner on a flat surface. Slide power cord horizon- tally to remove from notch in base. Loosen two screws connecting the motor to base and remove. Slide motor upward, releasing the white plastic lever from T- bracket of connecting rod. Turn connecting rod so offset arms rest in a horizontal position and egg trays are vertical. Lift offset arm to release con- necting rod from notches. Lift individual egg trays by offset arms while still in a horizontal position from offset arm notch in base and pull slightly to release the pin from the corresponding hole in the base.

Repeat with all six trays until you are left with an empty base. Place egg trays and base in dishwasher, run and dry. manual can be found here

Turn signal and hazard lamp schematic of Daewoo Korando shown in the following figure. It shows the connection and wiring between each parts and component of turn signal and hazard lamp system of the vehicle such as  alternator, ignition switch, hazard switch, tail, flasher unit, multifunction switch, and many others. Here is the schematic :

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