Symmetric Power Supply for Op-Amp Applications by 78xx and 79xx

Description:

This is a symmetric supply that can be used to power operational amplifier used circuits. You should be careful during using this power supply since it has no short circuit protection. On the other hand you can connect appropriate diodes to protect the circuit.

78xx and 79xx series regulators are used. xx denotes which voltage value is required at the output and xx value must be same for both ICs. J1,J2 and J3 are the transformeroutput connections. J2 must be connected to the middle output of the transformer...

1.5 Watt 1-2 km Range FM Transmitter

Description:

This is a well designed basic FM transmitter that you can easily receive the signals transmitted from this transmitter in a 1 - 2 km range with using a normal FM receiver. Another property of this circuit is that the coil is placed on the printed circuit board.

The input sound amplitude can be adjusted by using the P1 potentiometer. You can easily prepare the PCB by using any PCB editor and apply it to the board by using the ironing method...

One Button On Off Switch with 4093 and IRFZ44

Description:

The load is driven by the MOSFET IRFZ44 and 4093 AND gates are used in the circuit. The output of the 4093 IC drives the MOSFET. Only one button allows you to change the on-off state of the electronic circuits in which you use this switch. The circuit schematics is above. Click image to see the larger schematics diagram.