This 12V auto turn-off battery charger automatically disconnects from mains to stop charging when the batteries are fully charged. It serves to charge the battery of our car, using the 120/240 VAC
Aug 052017
Aug 042017
Full wave rectifier using center tapped transformer
This full wave rectifier requires a center tapped transformer. This additional end on the secondary winding of the transformer divides the voltage in this winding into two equal voltages. This additional end is grounded.
Jul 192017
Guitar Synthesizer using CD4046
To achieve the objective, the CMOS PLL CD4046 integrated circuit is used, producing an unusual sound from a guitar whish sounds very similar to a synthesizer.
Jul 172017
XOR logic gate
In digital electronics there are special gates. One of them is the XOR logic gate or exclusive OR gate. Equivalent XOR Logic Gate using common logic gates
Jun 302017
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.
Jun 292017
Half Wave Voltage Doubler
Voltage doublers produce twice as much DC voltage as a common rectifier could produce. The advantage of the Half Wave voltage doubler is that it has a line, which is common to the input and output
Jun 262017
12V Power Supply using Zener and 741 Op. Amp.
This 12V Power Supply has, as its main characteristic, a low output impedance. This is a very desirable feature in voltage sources and is achieved with a large open loop gain that the operational amplifier has.
Jun 192017
NOR logic gate
A NOR logic gate can be implemented with the concatenation of an OR gate and a NOT gate. NOT gate using a NOR gate
Jun 102017
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.
Jun 092017
This High – Low Temperature Indicator shows us, by means of two LEDs, when the sensed temperature is above or below a set limit.
When the temperature is above the pre-set temperature level, LED D1 will light up and if it is below, LED D2 will light up.
Jun 082017
Astable multivibrator using NAND gates
This astable multivibrator uses two NAND gates of the 4 available on the 7400 TTL integrated circuit. Two LEDs are used to view the status or logic output of each gate.
May 312017
Logic Probe using NOT Gates (Inverters)
This logic probe using NOT Gates is implemented with three NOT gates, one rectifier diode, two LEDs and two resistors.