Simple ac motor

Project Ideas

Fan Speed Control Circuit with IC CD4017B

Electronic project today is show how to build “Fan speed control circuit” which can control speed motor for fan or other equipment's. The simple concept project is use IC CD4017 to control 4 relays which connect each pole. IC CD4017B which is counter-cum-1kHz decoder and the signal is divided into ten equal intervals, 

4017 Counter

555 timer tutorial

Transistor as Switch

Breath Monitor

The mercury in rubber strain gauge is the detector of breathing. In the model device , strain gauge produced by medimatic . Dem ark was used. The change in length of strain gauge wrapped around the chest during

WHEEL OF FORTUNE

The slow-down circuit consists of the top three gates, R3, D1, C2, R4 and C3.
Sw1 is pressed for a brief period.
This charges the 47u and the 1u is charged via the 100k.
The voltage on the 1u rises until it puts a HIGH on input pin 11.

Overload indicator.

Two op amp are used as comparators to indicate excessive magnitude of an AF signal , either positive or negative ,even if the signal is asymmetrical. P1 sets the reference voltage for both op amps.This circuit is useful for audio amplifier and op amp circuits using split power supplies.

Auto,Boat OR barricade Flasher

Because of its ability to withstand the inrush current, this incandescent lamp flasher uses the C106 SCR. With the component shown th flash rate is adjustable by R3 (250k ohm) within the range of 36 flashes per minute ro16/ min.

Simple bike horn

The horn circuit uses only one gate of 4093 quad 2-input Nand schematic trigger. U1, connected in simple, low frequency , square wave oscillator circuit. The oscillator output at pin 3, drive the gate of Q1 . The drain of that FET drive a small horn speaker.

Engineering Electromagnetics(Book)

First published just over 50 years ago and now in its Eighth Edition, Bill Hayt and John Buck’s Engineering Electromagnetics is a classic text that has been updated for electromagnetics education today. This widely-respected book stresses fundamental concepts and problem solving, and discusses the material in an understandable and readable way. Numerous illustrations and analogies are provided to aid the reader in grasping the difficult concepts. In addition, independent learning is facilitated by the presence of many examples and problems. Important updates and revisions have been included in this edition. One of the most significant is a new chapter on electromagnetic radiation and antennas. This chapter covers the basic principles of radiation, wire antennas, simple arrays, and transmit-receive systems
Download:
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Backup battery Charger/monitor/alarm

Charging voltage is constant at the normal full-charge level, so the charging current drops as full charge is approached abd full charge  is maintained with a trickle current. the charging voltage can be adjusted between approximately 10 and 15 Vdc to accommodate lead acid (13.8V)  or lead calcium (13.2V ,13.5V maximum)deep cycle storage batteries.A separate connection is provided so that an external charger can be

LO PART TREASURE DETECTOR(METAL DETECTOR)

Locator uses a transistor radio as detector. With the radio tuned to a weak station , adjust c1 so the locator oscillator beats against the received Ignore warning signal. when the search head passes over metal the inductance L1 changes thereby changing the locator oscillators frequency and changing the beat tone in radio.

250 to 5000 watts PWM DC/AC 220V Power Inverter

Notes:
-The schematic circuit design is for a 250 watt output, while the pics are of my 1500 watts inverter that i built, to increase the power of the circuit you have to add more of the Q7 and Q8 transistors in parallel, each pair you add will increase your power by 250 watts, ex: to get 750 watts of power from the inverter you need to add 2 of Q7 and 2 of Q8 to the original design.

Circuit 1000 Watt Power Amplifier Blazer Schematics

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

Make This 1KVA (1000 watts) Pure Sine Wave Inverter Circuit

 

A relatively simple 1000 watt pure sine wave inverter circuit is explained here.


As can be seen in the first diagram below, the configuration is a simple mosfet based designed for amplifying current at +/-60 volts such that the connected transformer corresponds to generate the required 1kva output.

Q1, Q2 forms the initial differential amplifier stage which appropriately raises the 1vpp sine signal at its input to a level which becomes suitable for initiating the driver stage made up of Q3, Q4, Q5.

Light dependent sensor for multiple inputs

 

This light-dependent sensor uses LDRs to detect the presence or absence of light. as long as light soucrce striking the LDRs remain constant , the alarm does not sound but when the light is interrupted ,the alarm is triggered.you can use this circuit in other circuit or independly.

Electronic Canary

This circuit is a modified hartley oscillator with a couple of extra components included. The transformer is a small audio transformer, type LT700. The primary is center tapped with an impedance of 1Kohms at 1KHz . The secondary has an impedance of 8 ohms. The inclusion of R1 and C1 give this oscillator its characteristic "chirp". As the 100u capacitor charges via the 4.7K resistor, R1 the bias for the transistor is cut off.

HEE HAW ELECTRONIC SIREN