The half-wave rectifier rectification process.
Polarization of semiconductor diode in the forward and in the reverse direction. Input and output waveforms
Feb 142019
Feb 062019
Two Transistor Logic Probe
This Two Transistor Logic Probe is a very simple circuit that can be implemented using two NPN bipolar transistors (T1, T2) in a Darlington configuration.
Jan 312019
What’s the Difference between Analog and Digital?
Difference between Analog and Digital Digital refers to a discrete quantities. Analog refers to the quantities that vary with time on an ongoing basis.
Jan 292019
Capacitor Discharge Process.
In a series RC circuit, a capacitor does not immediately discharge after being disconnected from a power source of direct current. The capacitor voltage Vc decreases from the initial voltage on the capacitor to 0 volts in some amount of time.
Jan 242019
Doorbell for Deaf People.
When a deaf person is alone in a house, it would be very difficult to realize that someone is knocking on the door without any visual warning signal.
The main component for the Doorbell for the deaf circuit is the CMOS 4001 integrated circuit, which has four two input NOR gates
Dec 152018
The capacitor charging process
The capacitor charging process shows the variation of voltage and current in the capacitor over time, when it is connected to a DC voltage source
Dec 102018
What is a sequential circuit? The main difference between a combinational circuit and a sequential circuit is that in the sequential circuit there is a feedback from one or more of the outputs to one or more of the inputs. Looking at the following diagram, you can see that the output of the OR gate is feedbacked to the input of the lower AND […]
Nov 262018
What is a Schottky Diode? The Schottky diode or Schottky Barrier Diode unlike the semiconductor diode that has a P-N juntion, has an N-Metal junction. These diodes are characterized by their switching speed and low voltage drop when they are forward biased (typically 0.25 to 0.4 volts). Its symbol is showed on the following diagram. This diode works allmost like the […]
Nov 262018
12 volt Power Supply using 7805
This 12 volt power supply circuit is simple and useful. Sometimes we need to get 12 VDC, but we only have 5 or 9 volts regulators (7805, 7809).
Nov 072018
This Electric Current Flow Indicator gives a visual indication that there is a current flow. Possible applications for this small circuit may be: a battery charger, a voltage power source, etc.
In order to achieve our objective we place 3 rectifier diodes in series, which in turn are in series with the load / battery.
Nov 012018
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.
Oct 312018
DC motor speed controller circuit using 555
This simple DC motor speed controller circuit, works with 12 volts and controls a DC motor using the 555 integrated circuit.