LED Breathing circuit (PWM) for highpower LED, LED strip etc

LED breathing is one of the eye candy for every vehicles, LED fad in and fade out effect looks awesome with under body lighting.

We are using PIC microcontroller here, PIC12F683 is a small 8 pin circuit and having 1CCP module (PWM) in it, it wont cost too much, may be within Rs.60 (1$).we are using 1 pin for PWM output, 1 pin for button pressed feedback and another for button to vary breathing speed (delay between changing duty cycle of PWM), other 3 pins are left spare, you can use it for any other functions like blinkin.


Don't forget to get clean 5V DC power supply circuit before this

Circuit

*The components used in this circuit diagram of same package of original components,  

 Components

IC1:PIC12F683

R1: 1K Ohm

R2: 4.7K Ohm

R3: 100 Ohm

R4: 10K Ohm

R5: 470 Ohm

T1: BC547

Q1: TIP127

Push button, LED.

PCB, Project files & .HEX files

• Project files : Yandex Folder

Any problems?? Comment below

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12V to 5V Mobile Phone charger circuit (SMPS type)

The Voltage regulation Hero LM7805 will not works as we expected here, it will not provide enough juice(current) to charge cellphone's battery, especially more that 1500mah battery, So we need more current that provides enough juice to cellphone.

Here we are using LM2596 (Texas instruments) this provides 3A switch mode power supply. That is more than enough to charge 2 cellphones, Don't worry if you charge 1 cellphone, phone takes only max of 1A. It is the best/fast charging circuit i ever experimented.

Then here we go

Schematic

Components:

• IC1:LM2596
• D1: 1N5824 (schotty)
• L1: 33uH (coil & core type).
• C1:680uf 25V
• C2: 220uF 16V (different in schematic)
• R1,R2:100K
• R3: 470 Ohm.
• LED
• USB connector*

Project files and PCB:

Eagle Project file: DOWNLOAD

Reference: http://www.ti.com/lit/ds/symlink/lm2596.pdf
Any problems comment below or ping in Spot.IM community>>

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12V to 5V Clean Filtered DC power supply for automobiles

This circuit is to provide power supply for 1A 5V digital gadgets like gadgets including LCD, Microcontroller, or any gadgets or components that need neat and filtered 5V.

The microconroller based project for automobiles mainly having problems with power supply line, the car, motorbike or any automobile power supply includes starter motors, Horns, relays and so many voltage surging elements, the motors and relays may cause high backward spikes that may cause reverse polarity in line for few micro seconds. in other hand horn and again starting motor may cause sudden null voltage effects. But microcontroller needs pure uninterrupted power supplay.

The LM7805 is the hero of low cost voltage regulator as you are always use, But only 7805 didnt work for Automobile electronics it needs filter of-course. So here we are.

Circuit Schematic

Components:

• FB:ferrite bead - Normal (see picture).

  

  Ferrite Bead

• D1:1N4007.
• D2: MUR802 (super fast rectifier) (change in schematic).
• L1: 100mH 1.5W or 2W.
• C1,C2: 1000uF 25V.
• C3,C4: 0.1uF (Tantalum).
• IC1: LM7805 (change in schematic but same package in PCB).

PCB layout and project file:

• Eagle project file : Download

Any Problems, Comment below or ping in spot.IM community >>

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Modified 2 stage blinker circuit for LEDes and brakelight

This circuit is like an advanced version of first blinker circuit, it uses 2 astable circuits, not 2 IC. We can use 556 here. 2 Astable multivariator of Low and High frequencies are cascaded and gives good programmed pulse like 1 long pulse and 2 to 5 sort pulse (Depends upon setting).

The below circuit shows Multi-function blinker circuit

Components:

IC: U1A,U1B : LM556 (Duel timer IC)
Resistors: R1: 1.2K, R2:1K*, R3 750 Ohm, R5:220 Ohm
Pot: R4:1K Ohm, (R2:2K*)
Diode: D1,D2,D3: 1N4007.
Transistor: Q1: MJE200 or any power NPN transistor.
Capacitors: C1:100uF, C2,C4:10nF, C3:22uF.

Description:

• The First stage multivibrator is set to 5 hz, 50% duty cycle (on off 5 times in second ;) ).
• The second stage is a variable one. it varies from 15hz to 160hz
• When first stage in OFF state the second stage is ON -> High only
• When first stage is ON, The trigger circuit will activate second stage and low frequency pulses

Output graph:

PCB Layout & Project files:

• Multisim
• Cadsoft Eagle

If any problems, Comment below

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