This is the Ham radio power supply circuit with RFI elimination for Amateur radio. A typically Radio transmitters use High-frequency transistors as current driver so can cause very severe electromagnetic. Therefore, The power supply must be able to make the current higher than 10A. Figure 1 the schematic diagram RFI elimination This circuit must have the RFI(Radio Frequency Interference) eliminate system or filter too much harmonic effect. More Ideas The output is 13.8 volts and has the short Circuit protection We want a circuit that is affordable, and easy to build. The use of the package IC number LM350T 3-Amp Adjustable …
Mr jafar need to use the 12 volts 1 amp DC Power Supplies. In my sites has many circuits related them. – Cheap and old but sure, use transistor and zener as main http://www.eleccircuit.com/simple-regulator-by-transistor-c1061/ http://www.eleccircuit.com/dc-power-supply-9-volt-using-tip31-transistor/ – Cheap and popular all times, use IC7812 http://www.eleccircuit.com/regulator-5v6v9v12v-1a-by-ic-7805780678097812/ Note: If you have a 1A normally circuit. So your 12V power supply must to has 2A output current up. Please select more: http://www.eleccircuit.com/tag/12v-power-supply-circuits/ and http://www.eleccircuit.com/tag/12v-switching-power-supply/
This is Constant current circuit using LED. Normally the voltage drop across LED while forward bias will be about 1.2 to 1.4 volts depend on type of LED by has the temperature coefficient is -1.5 mV per degree Celsius. Which similar to the temperature coefficient of junction. between a base and emitter of silicon transistors. From this relationship can the constant current circuit that no temperature coefficient as show in Figure 1. Figure 1 Constant current circuit using LED From in the Figure current I flowing through the value. (U LED – U BE) / R And since temperature coefficient …
This circuit is used for controls the voltage battery is steady, which the Zener diode voltage regulator circuit apply very low current about 1mA only, cause there is ripple voltage about 1 mV at voltage changing between 10 to 30 volts. As circuit the output is fixed to 8V. In circuit the reference voltage is connected to input of 741 OP-AMP (popular ICs) , to a non-inverting input and output of circuit will same the zener voltage multiply with OP-AMP gain as below. Vo = Vz * {(R2 + R3)/R3} The advantages of this circuit have two reasons. (1.) we …