Capacitors in series – Capacitors in parallel.
How to obtain the equivalent capacitance of series capacitors and parallel capacitors? Formulas and examples
Aug 052020
Aug 052020
Temperature Alarm using thermostats
This simple alarm with thermostats circuit can be used on places where we must detect overheating. It uses 3 thermostats, and a one 2 contact, relay
Jun 052020
Series/Parallel Resistor Reduction.
Resistors reduction can be done making some simplifications using resistors in series and resistors in parallel formulas.
May 312020
Inverting Summing Amplifier using Op Amp
The inverting summing amplifier using op amp outputs a voltage equal to the sum of the voltages it has in its inputs. The following explanation is based on an adder of three inputs, but applies to an adder of any number of inputs
May 222020
Electrolytic Capacitor
Electrolytic capacitors have been developed to achieve large capacities in small physical dimensions. To achieve this large capacity, a special dielectric is used.
May 202020
NAND gate – Truth table.
NAND gate, also called universal gate, is a gate that produces a logic “0” output only when all logic inputs are “1”. Truth table.
May 112020
Automatic night light using 555 and relay
This Automatic night light using 555 IC turns lights on when there is no daylight. The circuit is perfect for lighting single places such as the garden, the front door of the house, the entrance to the garage, etc.
May 082020
Mesh Current Method in a Resistor Network
The Mesh current method is very useful to know all the current in a network of only resistors. This method, a little more extended, is also applied to circuits where there are resistances and reactance.
May 032020
TDA2822M 2 watt audio amplifier circuit
This 2 watt audio amplifier circuit is specially designed to consume little power and to be used with batteries or low voltage power sources.
Apr 062020
What is a Millman’s Theorem?
Millman’s theorem is used to directly obtain the voltage between the ends of a parallel branch circuit. Equivalent Millman circuit Formulas, example.
Apr 032020
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.
Mar 242020
Electronic sound control circuit (applause)
This electronic sound control circuit works like a sound activated relay and can activate or deactivate a device connected to it, by two consecutive claps.