Electronic circuits are all around us, from the alarm clock that wakes us up to the microwave that heats our food. While these may seem complex, many basic circuits are quite simple to build yourself using just a few cheap components. In this article, I'll walk you through the process of building a simple DIY electronic circuit that could end up saving you hundreds of dollars on household expenses over time.

Understanding Basic Electronic Components

Before diving into constructing your own circuit, it helps to understand some of the basic components that make up most electronic devices. Here are a few of the main pieces:


Resistors restrict the flow of electrical current in a circuit. They are rated by their resistance in ohms - the higher the ohm rating, the more they resist current flow. Resistors come in many shapes and sizes.


Capacitors store electric charge temporarily. There are various types but electrolytic and ceramic disk capacitors are most common in simple hobby circuits. They are rated by capacitance, measured in farads.


Diodes allow current to flow in only one direction. This makes them useful for converting alternating current (AC) to direct current (DC). Light emitting diodes (LEDs) are a special type of diode that lights up when current passes through.


Transistors control the flow of current and can act as an electrical switch. They have three pins - collector, base, and emitter. A small current applied to the base pin controls a much larger current between collector and emitter.

Integrated Circuits

Integrated circuits (ICs) contain miniaturized electronic components like resistors, transistors, and capacitors all on a single chip. Common ICs include timers, amplifiers, microcontrollers, and more.

Gathering Your Tools and Components

Now that you understand the basic electronic components, it's time to gather what you'll need to build your first circuit. Here are the recommended supplies:

Shop online electronics retailers like SparkFun, Adafruit, or your local RadioShack for these supplies. Buying a kit with various components is an affordable way to get started.

Constructing Your First Circuit

Once you've gathered the basics, it's time to build your first circuit. Let's start with a simple LED flasher circuit:

The Circuit Diagram

It helps to draw out a circuit diagram first. This shows the components and how they connect without wiring it up. Here's the diagram for an LED flasher:

How to Build a Simple DIY Electronic Circuit That Could Save You Hundreds on Household Expenses

This uses just a few components - an LED, resistor, capacitor, and 555 timer IC. The resistor limits current to the LED. The capacitor charges and discharges to create pulses. And the 555 acts as an oscillator to drive the LED on and off repeatedly.

Breadboarding the Circuit

Next, it's time to build the circuit on the breadboard. Follow the circuit diagram, connecting jumper wires between the positive and negative rails to the component leads inserted into the breadboard.

Make sure the LED is inserted correctly, with the positive anode aligned with the resistor. The 555 timer IC should have a notch on one end that lines up with the diagram.

Testing and Troubleshooting

Once wired up, connect the battery pack and see if the LED flashes on and off. If not, grab the multimeter and double check all connections. Make sure the jumper wires are securely inserted into the breadboard and that components are not backwards.

If needed, refer to the diagram and re-check each connection one-by-one. With patience, you should be able to get the simple flasher circuit working. Troubleshooting is part of the fun!

Example Circuits to Build

Once you have some experience, here are a few example DIY circuits you can build that could save money on household expenses:

Automatic Light Switch

This circuit turns lights on at night and off in the daytime automatically:

Automatic Light Switch

By turning lights on only when needed, this can reduce unnecessary power usage. The photoresistor senses light and the transistor works as a switch to control a relay connected to a light.

Eco Battery Charger

This simple circuit charges batteries more efficiently:

Eco Battery Charger

Many household devices like flashlights and remote controls use AA or AAA batteries. This specialized NiMH battery charger maximizes battery life and reduces waste.

DC Power Timer

This circuit turns DC appliances off automatically after a set time:

DC Timer

Timers help reduce wasted standby power used by chargers, LED lights, and other DC gadgets. The 555 IC creates pulses to drive a relay that disconnects power after a set duration.

With a bit of creativity and some very basic electronics knowledge, you can build many different useful circuits like these to help reduce household energy usage and expenses.


Constructing your own basic DIY electronic circuits only requires some cheap components, basic tools, and a willingness to learn. Start with simple circuits like an LED flasher using a solderless breadboard. As you gain experience, move on to more complex circuits that can automate home lighting, improve battery charging efficiency, or control DC power devices. Not only is it a fun hobby, but you could end up saving hundreds of dollars over time on household energy costs. So grab your soldering iron and start tinkering - making your own circuits is very rewarding! Let me know in the comments if you have any other money-saving circuit ideas.