# Circuit Building Reflection

## What did I Create?

We were asked to build 6 Circuits. We created a Logic Probe Circuit, a 555 Timer Circuit, and 4 Transistor Gates Circuit.

## Logic Probe Circuit

The logic probe circuit functions as a indicator for positive and negative charge.

## 555 Timer Circuit

The 555 timer has 2 LED's which flash at 2 second intervals, just like Railroad Crossing lights.

## Transistor Gates Circuit

The Transistor Logic Gates is a simple circuit, it helps us understand how positive and negative currents influence a circuit's performance.

## Logic Probe Circuit

The Logic Probe Circuit has many components. It has a loose wire which acts as a probe. The probe has to be placed in a location with either positive and negative charge, it will then light up a LED which indicates the charge. If there is a positive charge the Red LED will turn on, and if there is a negative charge the green LED will turn on.
Logic Probe Circuit

## 555 Timer Circuit

The 555 Timer circuit is a circuit that consists of 555 chip which is connected to 2 LED's, 4 resistors, and a capacitor. The circuit's job is to make two LED's flash at a timed interval. We were suppose to make our circuits go at a two second interval. I had to accomplish this by changing the resistance in the circuit. I changed the resistor and the capacitor to make the LED's go at a two second interval.
555 Timer Circuit

## Transistor Gates Circuit's

The Transistor Logic Gates Circuit's are simple circuits which include 3 transistors, 2 loose wires, 4 resistors, and a LED. The circuit incorporates the loose wire so that we can test whether the circuit works with positive and negative charge. Each Circuit has a different outcome, and to use check the circuit you would need to put the loose wire in either a positive or a negative charge.

The Truth Table results:

First Circuit

A(0) B(0) Off

A(0) B(1) Off

A(1) B(0) Off

A(1) B(1) On

Second Circuit

A(0) B(0) On

A(0) B(1) On

A(1) B(0) On

A(1) B(1) Off

Third Circuit

A(0) B(0) Off

A(0) B(1) On

A(1) B(0) On

A(1) B(1) On

Fourth Circuit

A(0) B(0) On

A(0) B(1) Off

A(1) B(0) Off

A(1) B(1) Off

## Logic Probe Circuit

I learned from the Logic Probe Circuit that a circuit does not always have to look like the schematic, and a circuit can be made in multiple ways. I also learned that space on a breadboard is very limited, so it should be used efficiently.

## 555 Timer Circuit

The 555 timer circuit made me understand that the 555 chip slows the input current so that it slowly reaches its output destination. It also made me understand that as resistance gets higher, the length of the intervals will get higher exponentially.

## Transistor Gates Circuit's

I learned that positive and negative current heavily affects circuits, as it changes the outcome of the circuit. I also learned that placing transistors in correct is very important, as it would change the output of the circuit.

## Challenge

I enjoyed how the circuits were challenging, and also enjoyed how the labs made us learn information about different parts from building the circuits.

## Wrong Postioning

I did not enjoy the process of fixing the components, because it was hard to locate the problem. I also found it difficult to place the components in the correct positioning, because I kept on placing transistors the opposite way.

## I would be more organized

I was not as organized as I should have been, if i were to do the project again I would place parts in a more organized/neat way, and I would highlight the schematic more often.