Zener Value Evaluator ,Fluid Level Alarm ,Basic Transistor Type and Lead Identifier ,Flag Diode-Based Fire alert & Auto Fan Speed Controller

Zener Value Evaluator
Utilizing this basic circuit and a known-esteem zener diode, you can discover the breakdown voltage estimation of any zener diode. The circuit is separated into two areas: zener evaluator and show unit. Controlled 12V and 5V are required to control the zener evaluator area, while the show area works off just 5V. Associate +5V, point An and ground of the zener evaluator segment to the particular terminals of the show area.

Fluid Level Alarm   
In water-level controllers for tanks, a DC ebb and flow is gone through the metallic tests fitted in the water tank to detect the water level. This causes electrolysis and erosion of tests, restraining the conduction of present and corrupting its execution. As a result, tests must be supplanted consistently to keep up legitimate current stream .

Basic Transistor Type and Lead Identifier
A bipolar intersection transistor (BJT) has three locales, of which the emitter and the gatherer are made of similar sort of semiconductor ('n' for npn and "p" for pnp) however the base is of inverse sort. In the event that we consider the base and emitter terminals (or the base and gatherer terminals), we get a p-n intersection diode. Yet, in the event that we hold gatherer and emitter terminals, we experience two diodes associated consecutive

Flag Diode-Based Fire alert
A basic flag diode can be utilized to manufacture a profoundly delicate fire alarm. Silicon diodes like OA71 furthermore, 1N34 react to infrared radiation and warmth from fire by creating reverse current over their terminals. In turn around predisposition mode, this impact is more significant. Ordinarily, for every degree rise in temperature, the diode creates 2 mV. This trademark is misused in this circuit to detect fire. The circuit can identify fire from a separation of up to around 30 cm

Auto Fan Speed Controller

Utilizing this circuit you can control the speed of 12V DC fans utilized as a part of autos. The circuit is worked around clock 555, which is wired as an astable multivibrator. The yield of the multivibrator is nourished to IRF 540 MOSFET. The fan is associated between the positive terminal of the battery and deplete (D) of MOSFET T1. Capacitor C1 is associated in parallel to the fan to balance out its speed. Free-wheeling diode D1 shields the engine from back emf. A wire is incorporated for assurance.


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