Electronics Online » Simple Projects

Electronics Project!!!!?

Electronics Online — Sun, 28 Feb 2010 03:01:51 +0000

Can anyone please suggest me some good project related to electronics….
….not something really hi-fi but something that i can understand at my level…..i’m doing b.tech in electronics(second year)…so i’m not a complete engineer….but i want to make something…..
…anything good would do!!!thanx in advance!!!..
..

Electronics Project Center – Part 1

Electronics Online — Tue, 02 Feb 2010 03:02:27 +0000

All about an Electronics Design aid that I build over the past few months. If you’re into electronics and are thinking about building your own project center, then you might find this an interesting video. You can find the display I talk about at: www.allelectronics.com

LED Pulse Effect circuit

Electronics Online — Wed, 28 Oct 2009 00:52:55 +0000

This is an LED pulse effect circuit. The effect result of this circuit is that the LED goes from off state, lights up gradually, then dims gradually.

This operation mode is obtained by a triangular wave generator formed by two op-amps contained in a very cheap 8 pin DIL case IC. Q1 ensures current buffering, in order to obtain a better load drive. R4 and C1 are the timing components: using the values shown in the parts list, the total period is about 4 seconds.

R1,R2 _________4K7 ohm
R3    _________22K ohm
R4    _________2M2 ohm  (See Notes)
R5    _________10K ohm
R6    _________47R ohm  (See Notes)
C1    _________1ÂµF/ 63V Polyester Capacitor
D1    _________5mm. LED (See Notes)
IC1   _________LM358  Low Power Dual Op-amp
Q1    _________BC337  NPN Transistor

Notes:

The most satisfying results are obtained adopting for R4 a value ranging from 220K to 4M7.
Adopting for R4 a value below 220K, the pulsing effect will be indistinguishable from a normal blinking effect.
The LED can be any type and color.
You can use a filament lamp bulb instead of the LED, provided it is rated in the range 3.2 to 6V, 200mA max.
Using a bulb as a load, R6 must be omitted.
Power supply range can be 4 to 6V: 4.5V is the best compromise.
Do not supply the circuit with voltages exceeding 6V: it will work less good and Q1 could be damaged when a bulb will be used as the load.
At 6V supply, increase R6 value to 100 Ohm.

Original page of this LED Pulse Effect circuit:
visit: http://www.redcircuits.com/Page51.htm

Simple Audio Mixer circuit

Electronics Online — Mon, 19 Oct 2009 14:56:47 +0000

This is a simple audio mixer circuit diagram:

You can add some resistors in parallel connection for more audio input. To adjust the volume for each input channel, add linear trimmer or potentiometer with configuration: pin1> ground; pin2>output; pin 3>input.

Electronic buzzer circuit

Electronics Online — Tue, 29 Sep 2009 13:50:58 +0000

This in a really simple electronic buzzer circuit based on timer IC NE555. The IC 555 act as astable multivibrator which will generate audio signal frequency. The frequency value is depended the value of 56K resistor and 10nF (0.01 uf) capacitor… you may replace the 56K resistor with a variable resistor to adjust the frequency.

1W Audio Amplifier based on LM386N

Electronics Online — Wed, 23 Sep 2009 15:46:17 +0000

This simple amplifier circuit will be nice for newbie project/junior student. Require an IC LM386N to build a mono channel amplifier. There are few components such as capacitor, resistor, potensiometer and speaker in this circuit, so the students will know the real shape of components.

Parts List :

Capacitors :
C1, C5 2.2 uF / 50Vecap _________2
C2, C9 10 uF / 25V ecap _________2
C3, C7 100 nF mono (104) ________2
C4 100 uF / 16V ecap ____________1
C6, C8 470 uF / 16V ecap ________2
C10, C11 47 nF mylar (473) ______2

Resistors :
R1, R2 10 ohm ___________________2
Pot 1 10k ohm stereo pot ________1

Misc. :
IC 1, 2 LM386N __________________2
8 pin IC socket _________________2

Download the complete explanation of 1W amplifier circuitHERE

Anti Theft Alarm

Electronics Online — Sat, 18 Jul 2009 14:43:43 +0000

This anti theft circuit uses timer IC 555 to produce the sound. The alarm will keep “silent” when the thin wire is connected the pin 4 of IC to the ground. When the thin wire is broken, the alarm will set to “crying”…

Police Siren circuit

Electronics Online — Wed, 15 Jul 2009 14:43:19 +0000

This is a police alarm circuit.Â The two 555 timer ICs used as astable multivibrators. The frequency is controlled by the pin 5 of the IC. Actually, the sound is genereted by combination of sound from both IC 555. One timer generated low frequency and the another generated high frequency. By varying VR1 you can set how fast the siren changes from high freq. to low freq. VR2 sets the siren frequency.

Simple FM Receiver with 1 Transistor

Electronics Online — Mon, 08 Jun 2009 03:20:36 +0000

This is very simple FM Radio receiver with only use 1 transistor.

Not only simple and easy to build, this circuit also inexpensive. You can build this circuit with low risk.

For complete explanation, you may visit this page or download the full explanation here

LED Flash Circuit

Electronics Online — Thu, 04 Jun 2009 19:09:34 +0000

Here the another simple LED Flasher circuit… This circuit uses CMOS 74C04 IC to alternately ON and OFF two LEDs that are connected in parallel.

schematic diagram:

component part list: