Make a simple audio amplifier using lm386,

This is a simple audio amplifier circuit that is easy to build and has few components. This circuit is built around the LM386 audio amplifier integrated circuit, that can be used with a small 9 volt Battery Operated, Current use as little as 5 milliamps. and amplification up to 500 mW.

The LM386 is an audio amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200.

This audio amplifier module can be used to play your FM receiver kit, make infrared based music transmitter and receiver, etc.

1. Circuit diagram

Component list:-

1. IC lm386

2. capacitor-0.01uf,0.1uf,220uf,10uf

3. resistor-10ohm,

4. battery, speaker, 3.5mm cable

2. Another circuit diagram

Component list:-

1. IC lm386

2. resistor-10r

3. variable resistor- 10k

4. capacitor-10uf,0.047uf,100uf(4)

5.Battery-9V, MIC OR 3.5mm Cable

3. Here is Another circuit diagram

Component list:-

1. IC-lm386

2. Capacitor-10uf,2.2uf(both 50v),470uf,220uf(both 25v),0.1uf,0.22uf,

3. vr-10k preset

4. Resistor-1k,22e,2k2,

5. Speaker,3.5mm cable,battery-9v,switch, led.

4. This Circuit  diagram in using two transistor(BC547)

                                                                                                                                      

      Components list:-

1. Resistors (2.2kΩ; 3.3kΩ; 470kΩ; 220kΩ; 1.2kΩ)
2. Capacitors (0.1µF x 2; 10µF,16V)
3. Transistors (BC547 x 2)
4. Condenser mic
5. Speaker (8Ω, ½ Watt)

5. this another circuit in using NE555

Component list:-

1. IC NE555

2. capacitor-3.3uf,0.1uf(2),10uf,0.047uf,470uf,100uf

3. rseistor-1.2k,10ohm,

4. vr-10k

5. led. speaker, battery, 3.5mm canle

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Simple DIY FM transmitter Circuit with Schematic

Hello friends Today I will publish lots  of the easiest, simplest and the cheapest FM transmitter circuit. That will do it yourself easiest ways.

You can make simplest FM transmitter using one transistor and less components and it is an easy and simple project for beginners.

Before you proceed, please see the schematic given below. In the schematic, you will see the components required for making an FM transmitter, The transmission range of this circuit is approximately 20-30 meters.

1.The schematic of FM transmitter is given below:

Components list below:-

1. Q1- Transistor- 2N3904
2. Capacitors- 4.7pF, 20pF, 0.001uF, 22nF.
3. Variable capacitor:(0-100pf)
4. Resistors- 4.7k Ohm, 470 Ohm
5. Condensor/ Electret Microphone
6. Inductor- 0.1uF.
6. 7 turns using 26 SWG wire.
7. Antenna:

2. Here is another  schematic of FM transmitter is given below:

component list below:-

1. transistor-2n2222(bc547)
2. resistor-27k(2),4.7k,270ohm,
3. 0.047uf
4. 10uf
5. 0.01uf
6. 5.6pf
7.7 turn using swg wire
7.5-20pf(trimmer variable capacitor)
8.mic


3. Here is another  schematic of FM transmitter is given below:

IF you need more circuit then you go to below given wbsite

1.http://www.talkingelectronics.com/

2.http://circuit-zone.com/

thank you

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Make a simple low cost 100w inverter (12v DC to 220v AC)

Today I will make a simplest circuit for 100 watt  inverter  for   generating    12v  DC  to 

220v AC.  So input voltage 12V (battery 12V) to output volt 220V AC 50HZ, it is Easy circuit because less component to use. 

• It can be used as inverters for home needs to enable light loads (electric bulb, CFL, etc) at the time of electricity failure.
• You can construct this circuit of simple inverter at a cheap rate with locally available components.
• https://advancetax.in/
  

1. using IC CD4047 and MOSFET IRF540

COMPONENT LIST:-

R1-330Ω

R2,R6-1K

R3,R4-220Ω

R5-390K

C1-0.01uf

C2-2200uf/25v

D1-1N4007

Q1,Q2-IRF540

IC-CD4047

TX-9-0-9(10A/5A)

12V BATTERY

LED INDICATOR

Notes.

•     B1 can be  a 12V/ 6Ah lead acid battery.
•     Q1 and Q2 must be fitted to a proper heat sink.
•     T1 can be a 9-0-9 V primary, 230V secondary, 150VA transformer .
•     Do not expect much from this circuit. The is very simple one suitable for low grade applications.
• https://advancetax.in/
  

2. Another one is using CD4047 and 2N3055

COMPONENT LIST:-

R1 = 250K (Variable resistor/POT)

R2,R3-4.7K

R4,R5,R6,R7-0.1Ω(5W)

C1 = 0.022uF
C2 = 220uF-25V
D1 = BY127 Diode
D2 = 9.1V Zener Diode
Q1, Q4 = TIP122 Transistor
Q2, Q3, Q5, Q6 = 2N3055 Transistor
F1 = 10A Fuse
IC1 = CD4047
TX = 9-0-9v(10A/5A)

Notes.

• Use the POT R1 to set the output frequency to50Hz.
• Use a 10 A fuse in series with the battery as shown in circuit.
• Remember,this circuit is nothing when compared to advanced PWM inverters.This is a low cost circuit meant for low scale applications.

THANK YOU.......

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4 channel infrared remote control switch

Description

4 Channel Infrared (IR) Remote is a simple kit using the famous HT12A and HT12D encoder / decoder chips from Holtek

Transmitter Schematic

Receiver Schematic

Transmitter PCB

Receiver PCB

 

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How to Build a Simple Automatic Street Light System

There have been lot of problems in street lights. Major problem in some places is every evening a person has to come and switch ON the street light and it should be again switched off in morning.  

So this problem can be overcome by using a simple circuit. Below shown circuit will be automatically switched ON and OFF during night and morning times respectively.

                     

                        **SIMPLE CIRCUIT**

                      

                      1.circuit diagram (using resistance &transistor bc547)

                                                                                                                                                                                                                                                                                                                                                                                                                   COMPONENT LIST:-

         1. R1,R3-330ohm

        2. R2-1Kohm

             3. Q1,Q2-BC547

4.  LDR

5. LED

6  BAT

2.Circuit Diagram (using LDR  sensor & IC 555)

COMPONENT LIST:-

1. 9v Battery with strip

2.        Switch

3.  L.D.R (Light Depending Resistance)

4.  I.C NE555 with Base

5.  L.E.D (Light Emitting Diode) 3 to 6 pieces.

6.  Variable Resistance of 47 KΩ

7.  P.C.B (Printed Circuit Board of 555 or Vero board.

                 

                     **COMPLEX CIRCUIT DIAGRAM**

 1.Circuit diagram  (using ic 555)

COMPONENT LIST:-

Resistors (all ¼-watt, ± 5% Carbon)

R₁ = 10 KΩ/10-watt

R₂ = 33 KΩ

R₃ = 39 KΩ

R₄, R₆, R₇ = 10 KΩ

R₅ = 100 Ω

C₁, C₅ = 0.1 µF

C₂ = 1000 µF/25V

C₃ = 10 µF/25V

C₄ = 0.01 µF

IC1 = NE555 timer IC

T₁, T₃ = BC548

T₂ = 2N2222

ZD₁ = 9.1V/0.5V

D₁ = 1N4001

Triac₁ = BT136

LED₁ = RED color

LDR₁ = light-dependent resistor

F₁ = Fuse, 5A

B₁ = 100W/ 230V AC

SW₁ = On/off Switch

2.Circuit diagram (using TRIAC BT136)

 

COMPONENT LIST:-

1. R1-60KΩ(1/2 watt)

2. R2-1KΩ

3. D1-1N4001

4. C1-100UF/16V

5. Q1-558

6. Q2-548

7. TRIAC(BT136)

8. 9V BATTERY OR TRANSFORMER

9. LDR 

3.Circuit diagram (using RELAY)

COMPONENT  LIST:-

1. R1, R2, R3 = 2K2,

2. VR = 10K preset,

3. C1 = 100uF/25V,

4. C2 = 10uF/25V,

5. D1 ---- D6 = 1N4007

6. T1, T2 = BC547,

7. Relay = 12 volt, 400 Ohm, SPDT,

8. LDR = any type with 10K to 47K resistance at ambient light.

9. Transformer = 0-12V, 200mA

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A VERY SIMPLE IR REMOTE CONTROL SWITCH FOR AN ELECTRICAL APPLIANCE

Connect this circuit to any of your home appliances (lamp, fan, radio, etc) to make the appliance turn on/off from a TV, VCD or DVD remote control. The circuit can be activated from up to 10 metres.
The 38kHz infrared (IR) rays generated by the remote control are received by IR receiver module TSOP1738 of the circuit. Pin 1 of TSOP1738 is connected to ground, pin 2 is connected to the power supply through resistor R5 and the output is taken from pin 3. The output signal is amplified by transistor T1 BC558 (pnp).
The amplified signal is fed to clock pin 14 of decade counter IC CD4017 (IC1). Pin 8 of IC1 is grounded, pin 16 is connected to Vcc and pin 3 is connected to LED1 (red), which glows to indicate that the appliance is ‘off.’ 
The output of IC1 is taken from its pin 2. LED2 (green) connected to pin 2  is used to indicate the ‘on’ state of the appliance. Transistor T2 (BC548) connected to pin 2 of IC1 drives relay RL1. Diode 1N4007 (D1) acts as a freewheeling diode. The appliance to be controlled is connected between the pole of the relay and neutral terminal of mains. It gets connected to live terminal of AC mains via normally opened (N/O) contact when the relay energises.

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