GANESH GADGETS: Miscellaneous

Have you imagined a blink circuit without arduino!! It was very common using a 555 timer circuit building a flasher or blink circuit.

#Requirements:

1.555 timer IC

2.Capacitor

3.Resistors

4.Printed Circuit Board

5.Wires

6.Tools for soldering and 5v power Supply

7.Leds

1. See the pin diagram of 555 IC.

2. Theory behind this.

The IC is connected as a astable multivibrator with a duty cycle of about 10%.
In figure 1 the LED will be ON for a short period of time and OFF for a longer period. The duty cycle can be reversed if the LED is connected as shown in figure 2 but the battery consumption will also increase due to the fact that the LED will stay ON for a longer period of time.

3. Circuit diagram.

If you didn't get anything by reading above,you can simply connect the elements according to the circuit diagram given below.

The above circuit diagram is copied from internet you can modify this accordingly. So I have replaced higher value resistors with 10k ohm and lower value resistors with 200 ohm and capacitor of 63V/10 uF.

Actual Circuit:

I suggest that before making the circuit of PCB, you should try it on breadboard for best results and adjust timing of your flasher circuit.

I have also brought out additional output pins from leds. You can use them to power up relays and flash bigger lights.

To vary resistor you can use variable resistor or a 10k potentiometer and also the capacitor also.

for reference:

1.https://www.electroschematics.com/8443/555-led-flasher/

2.https://circuitdigest.com/electronic-circuits/flashing-led-using-555-timer-ic

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Portable emergency mobile charger

KISS is a better way to build things. I mean Keep It Simple Stupid(KISS). In this post I will build a simple Mobile charger using a DC geared motor.

Things you needed:

1. DC geared motor(100 or 150 rpm)

2. 5V voltage regulator(7805 IC)

3. USB female connector

Tools: soldering things, hot glue gun, wires, plastic case

CIRCUIT DIAGRAM:

When the shaft of dc motor is rotated at suitable speed it generate about 5-12 V. The voltage regulator here works as constant voltage source to mobile device as mobile and many other electronic devices run at contant 5V DC. So any unwanted higher value is cut off by 7805 IC.