De Polarize Electrolytic Capacitor.

When we are using Electrolytic capacitors in our circuits, we should be aware about the polarity of the Electrolytic capacitor. There is positive and negative terminals for an electrolytic capacitor. If the terminals are reversed during the connection, the capacitor will not work in the circuit.

But, by connecting the Electrolytic capacitors in certain arrangement, we can depolarize the electrolytic capacitor. The method is to connect  two Electrolytic capacitors in series as shown in the figure.

 Now that you have a de polarized electrolytic capacitance.

TOY CAR REMOTE HACK

I had a toy car which works on remote control. It was running on four pen batteries of 1.5V in the receiver circuit and RC transmitting remote had a 9V double battery. It could move forward and backward. I found it wonderful to use it as a remote for house equipments.There was a requirement of  lighting the lights when I go to the terrace. It was difficult to search for the switch in the darkness.So the idea hit up on me.I connected the receiver section of the toy car to a continuous supply of about 8V by connecting through a 12V transformer 500mA , then to a rectifier circuit as shown in the figure.The connections of the receiver to the DC motor were un-soldered and connected it to two 6Vrelays.12V relay will not work.Relays are connected through diodes. This arrangement helps to drive the two relays.Look it carefully.Thus when the forward button is pressed in the remote first relay gets activated.Similarly when reverse button is pressed,second relay gets activated. Thus you can control two equipments at your house wireless using a cheap toy car remote system.