Power failure alarm using transformer and relay
This power failure alarm circuit is very simple and is very useful when used with electric ovens, a refrigeration systems or to prevent a thief from cutting off the electrical power because it immediately warns of the problem. It also serves you when the fuses have blown.
This 12v battery charger circuit using a LM350 and LM301A op-amp.
This 12v battery charger circuit allows you to charge a 12-volt car battery using a LM350 voltage regulator and a LM301A operational amplifier.
With this sound activated flash circuit, you can achieve incredible pictures of the most unexpected moments.
Pictures like a water balloon that just burst and the water still floats in the air, or when an object of any type explodes.
How to Protect the 500mA Fuse of a Multimeter?
It is very important to protect the 500mA fuse of a Multimeter due to the high frequency that these are burned.
Water level alarm with three transistors
Water level alarm. Simple & small alarm with few components. Has small current demand, it can work with a 9V battery for a long time
Capacitor charging process
Capacitor charging process shows the variation of voltage and current in the capacitor over time, when it is connected to a DC voltage source
Logic probe circuit with CD4001 IC
This logic probe circuit is useful for people who needs an instrument to measure the logic levels on digital circuits. This circuit is implemented with CMOS IC technology and is recommended for testing circuits using the same technology
Transistor – Zener diode Voltage regulator circuit
This circuit delivers an output voltage established by the voltage of the zener diode less 0.7 volts. The 0.7 volts is the average voltage drop between the base and the emitter of a transistor. (Vbe)
Parallel RC circuit
Voltage, Currents, Phasor diagram & Impedance. Voltage is the same on the capacitor and resistor. Current is ahead of the voltage in the capacitor
What is a Truth Table?
The Truth Table is used to simplify boolean equations obtained from digital circuits. The truth tables can have many columns, but all tables operate in the same way.
Missing pulse detector circuit or No pulse detector circuit.
This circuit is very interesting because it can detect or warn of the absence or delay of an expected pulse, which under normal conditions should be received at predefined intervals.
This light sensitive alarm is very simple and works using, as main components, a transistor, an LDR and a relay.
The alarm activates when the illumination level changes from almost total darkness to a moderately high illumination level. When this happens the alarm is locked and the alarm signal, be it a light or a sound, remains active.