Running LED Circuit

Running led is a basic applicative circuit whose usage can be modified in such a way that it can form running letters, drawings or characters running by arranging the led in accordance with our wishes.

Running Led circuit scheme :

Component:

1. LED
2. R1=1K
3. R2-R8=220 Ohm
4. VR=10K
5. C1=10pF
6. IC1=555
7. IC2=4017
8. B1=Battrey  9V

Circuit Explanation:

IC4017 is an IC decade counter that outputs high value (logic 1) alternately with timer term corresponding to timer / clock that goes into the IC, as the clock generator we use IC 555 with asatable base circuit, duration of this clock / timer can we set by rotating the variable resistor.

Automatic Flashlight Circuit

This time we will try to assemble Automatic Flashlight Circuit which is applied to home flashlight. This tool works once to set the flashlight like a bright flame, dim or in accordance with our wishes. Flashlights for special purposes consist of lamps with heavier and longer material, and produce brighter light. Factors to consider when designing a flashlight include light output, durability, and the ability to operate in a special environment. Battery life is also an important factor.

Automatic Flashlight Circuit Image:

Component:

R1 = 8K2

R2 = 33K

R3 = 4K7

R4 = 8K2

R5 = 5K6

R6 = 390 Ohm

C1 = 47nF

C2 = 47nF

T1, T2, T3 = TUN type

T4 = BC141

D1 = DUS Type

L1 = Lights 4.5-9 Volt

P1 = 100K

B = 6-12 Volt Battery

In assembling this Automatic Flashlight circuit, try to assemble the circuit unit into a flashlight box according to the types and sizes we use. By using a potentiometer as a regulator of light then now we can save energy from the flashlight.

Portable Microphone Preamplifier Circuit

The Portable Microphone Preamplifier circuit is primarily intended to provide the usual stereo home amplifier with microphone input. The power supply from the battery is a good compromise, in this way the input circuit is free of low frequency and the power connection to the amplifier is simpler, due to the absence of power cord and power supply. Using the Stereo Microphone, the circuit capability must be doubled. In this case, two separate levels of control are better than a dual-ganged stereo potentiometer. A low current (about 2mA) will ensure the battery is more durable.

Schematic of Portable Microphone Preamplifier Circuit:

Component:

P1 = 2K2 Linear Potentiometer

R1, R2, R3 = 100K 1/4 Watt

R4 = 8K2 1/4 Watt

R5 = 68 Ohm 1/4 Watt

R6 = 6K8 1/4 Watt

R7, R8 = 1K 1/4 Watt

R9 = 150 Ohm 1/4 Watt

C1 = 1uF / 63V Polyester Capacitor

C2, C3, C4 = 100uF / 25V Electrolytic Capacitors

C5 = 22uF / 25V Electrolytic Capacitor

Q1 = BC560C 45V 100mA PNP Transistor

Q2 = BC550C 45V 100mA NPN Transistor

J1 = Jack socket (Mono 3 or 6mm)

How it works :

This circuit is based on low noise noise, high gain two phase PNP fan NPN amplifier transistors, using DC negative feedback through R6 to stabilize proper working conditions. The output level is attenuated by P1 but, at the same time, the stage gain is lowered because of the increased value of R5. The unusual relationship of P1, helps in obtaining high input headroom, which allows to overcome various input sources (0.2 to 200mV RMS for 1V RMS output).

Note:

• The harmonic distortion is about 0.1% @ 1V RMS output (all frequencies).
• Maximum input voltage (maximum cursor level set maximum) = 25mV RMS
• Maximum input voltage (level of cursor control set in middle position) = 200mV RMS
• Covering the circuit in a metal casing is highly recommended.
• Simply connect the output of this device to the Aux input of your amplifier through the appropriate cables and connectors.

Sound Bell Circuit

Sound Bell Circuit is a series of electronic tones or sounds arranged in such a way that it contains rhythm, song, and harmony. In this world almost everyone loves music. No wonder when the music is applied to many devices used by humans, one of them is the bell. There's even a bell that sounds human speech. But on this occasion we will discuss about the bell that can produce or make a sound of music / tone. Sound Bell Circuit is perfect as an exercise for electronics enthusiasts who are still beginners. But for the senior is not prohibited anyway to make it, either made just for a toy or indeed to be a doorbell.

Picture schematic of musical sound bell circuit :

Component:

R1 = 100K

R2 = 3K3

R3, R4, R5, R6, R7 = 47K

R8 = 150K

C1 = 33pF

C2 = 10nF

C3 = 10nF

C4 = 10nF

C5 = 0.02uF / 6V

C6 = 0.047uF / 6V

C7 = 100uF / 6V

C8 = 1000uF / 6V

IC = MN6221

TR1 = FCS 9012

TR2 = FCS 9013

S1, S2 = Slide Switch

Speaker = Impedance 4 Ohm

Sound bell circuit like the above scheme is a series of bells that can produce some music sounds that are tailored to its IC type. This circuit is perfect for door bell. The basic component is an IC type MN 6221 which has 16 pins / feet and is amplified by two transistor type FCS 9012 and FCS 9013. Okay, good work and good luck.

Rat Repellent Circuit

Rats repellent circuit is one application of electronic circuit in everyday life.Now with a series of electronics rat repellent it will be one alternative to overcome various problems caused by rats. This tool is an environmentally friendly tool, this tool can also be used as a distributor of hobbies and tinkering with electronics circuits. The electronic components needed to make rat repellent are not much, cheap and easy to find in electronics stores. The circuit can be made on a PCB.

Here is the picture of the circuit scheme :

Component :

R1=1K

R2,R3=15K

C1=1nF

C2=1uF/16V

C3=10nF

C4=220nF

C5=1000uF/16V

D1-D4=1N4001

IC1=555

TR1=Trafo 6V/200mA

SP1=Tweeter

The mouse electronics circuit is simply an oscillator that emits ultrasonic waves in the 20 - 40 KHz frequency range. The resulting ultrasonic waves will not be heard in our ears but will be very disturbing to the ears of mice. For us there is no effect, but the effects experienced by rats will feel very powerful.

Use loudspeaker from peizo electric or tweeter shape speakers to make ultrasonic frequency more effective. Electronic rat repellent is effective for a room with a maximum of 200 m² from the exact placement. Can be placed for example in the upper corner of the room the frequency can spread throughout the room without a hitch. Turn on continuously to keep the mice do not come again, do not worry about the consumption of electricity because the electricity required is low enough.

Unique Alarm Circuit

Judging from its name "Unique Alarm Circuit", this alarm is unique. Because this alarm works when the room is dark. The mode of operation of the theft at home (office) is usually by extinguishing the lights so that they can leluada run the action. That is why this alarm circuit is created.

The unique alarm circuit scheme below:

Component:

R1=100K

R2=1M

R3=Trimpot

R4=LDR(Light Dependent Resistor)

C1=1000pF

IC1=NE555

B1=Baterrey 9V

Buzzer

The Unique Alarm Circuit is actually a dark detector circuit that can be used to generate an alarm sound when the light is in the darkroom. This circuit uses Timer IC NE555. LDR is used for light sensing. When the right light falls on LDR the resistance is very low. When there is a hitch to light then LDR resistance increases. At the IC the current is triggered and pushes the buzzer to generate the alarm sound. If the transistors and relays are connected at the output (pin3) of IC1 instead of buzzer, the electric appliances can be activated as light.

Insomniac Recovery Circuit

The Insomniac Recovery Circuit is a new alternative in the effort to deal with this sleepless taker. This circuit is a simple circuit that produces rain sound effects. The Japanese researchers are the first to suggest that the sound of rain has a relaxing effect. With the help of this simple circuit we can produce a sound of rain that can help to put someone to sleep in case of insomnia.

Below you can see and learn the scheme:

Component :

R1=270K

R2=100 Ohm

R3=220K

R4=270K

R5=2,7K

R6=220 Ohm

R7=47 Ohm

C1=10nF

C2=0,1uF

C3=1nF

C4=10uf/25V

T1=BC107A

T2=2N1613

IC1=741

P1=47K

P2=100K

LS=4-32 Ohm

Power Supply = 12-30V/60mA

Actually Insomniac Recovery Circuit is a series of rain sound generator. T1 is used as a noise generator and the signal is amplified by IC 741 and through T2, R7 and C4 goes to the headset with low resistance. If you do not want to use headphones you can replace them with speakers with impedance between 4-32 Ohm. With the help of p1 can adjust the sound level and P2 with tone.