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Making your own universal remote control systems today is very easy. Such procure the relevant chips, assemble them and here goes, your hi-tech remote control device is working for you. Here we explain a couple RF 433kHz remote control chips especially designed for the purpose. The IC TWS-434 along with its encoder chip HOLTEK’s HT-12E form a high class transmitter circuit, whereas the chip RWS-434 through its complementing decoder IC HT-12D operates as the receiver module. Both of the above modules are able to exchange 4-bits of discrete data for control four external loads separately. With the easy availability of accurate remote control chips, making your own universal remote control modules is today just a matter of few hours. We discuss a couple of compact RF remote control transmitter and receiver modules here using the chips: HT-12E, HT-12D, TWS-434, RWS-434 Making a hi-end professional remote control system at home is a child’s play now. With the advent of micro remote cont...

The following couple of circuit diagrams provide a glimpse of the configuration for making a precision rectifier and direct coupled power source circuits.  Precission Rectifier circuit diagram. Direct Coupled Power Circuit Diagram CMOS Power Booster Circuit Diagram The MC1556 operational amplifier way be used as a voltage follower ln a hid; amplifier application. The high input impedance avoids loading effects on the bridge and transforms the impedance down to a level where a third amplifier used in a differential mode can provide voltage gain, ll) in this case. The third amplifier employs the standard offset adjust circuit to provide nulling capability for the configuration. Although the circuit is shown for complementary supply voltages, , it lends itself well to operation from a single supply since the bridge can be operated iust as well from the single supply. One must, however,,provide for biasing the nowgrounded 100 kS2 resistor to half the supply voltage using a simple resis...