Window comparator using op amps

A window comparator using operational amplifiers lets you know if a signal (voltage level) is within or outside a previously defined acceptable voltage limit. Using a comparator or operational amplifier that controls the upper voltage level and another comparator that controls the lower voltage level, a window comparator can be implemented.

What is a PUT?

PUT – Programmable Unijunction Transistor. Main characteristics. PUT and UJT. Oscillator circuit design and waveforms. Frequency formula

Non-inverting Operational Amplifier (opamp).

How to find the voltage gain (formula). How to find the Input impedance (Zi) and output impedance (Zo) of a non-inverting operational amplifier.

What is a Photodiode? Light Detector Diode.

Photodiode looks similar to the common LED, but it has a feature that makes it very special. It is a device that converts light into electric current.

Operational Amplifier as Comparator (voltage comparator)

Operational Amplifier as comparator. Op-Amp can work as comparator when the differential gain in open loop is high and the speed is not a critical factor

The SBS – Silicon Bidirectional Switch is a symmetrical low power device used on trigger applications. The SBS is more versatile than the SIDAC.

It also has an additional terminal, which allows you to modify its trigger characteristics with small pulses of current.

UJT or Unijunction transistor

The UJT or Unijunction transistor is constituted by two polluted regions, with three external terminals: two bases and one emitter.

What is a 7-segment Display?

The 7-segment display, is a component used to represent numbers in many electronic devices.

Today, it is very common to find LCDs in much electronic equipment, but there are many that still use the 7-segment display for its simplicity.

What is a Darlington transistor?

The Darlington transistor is a special type of transistor with a high current gain. It consists of two internally bipolar transistors being connected in cascade

What is an  SCR?

The SCR (Silicon Controlled Rectifier) is a 4-layer semiconductor device that works as an almost ideal switch.

What is an LDR – Photoresistor?

LDR (Light Dependent Resistor) is light sensitive resistor whose resistance changes with the light intensity that falls upon it.

FET (JFET)

Field effect transistor or FET is a particularly interesting transistor and it can be of two types: the Junction Field Effect Transistor or JFET and the Metal-Oxide Semiconductor Field Effect Transistor (MOSFET).