Rongge

This is the Simple Overtone oscillator with crystal switching Circuit Diagram. The large inductive phase shift of LI is compensated for by Cl Overtone crystals have very narrow bandwidth;, the re fore, the trimmer has a smaller effect than for fundamental-mode operation.  Simple Overtone oscillator with crystal switching Circuit Diagram

This is a Simple 12 Volt / 2 A Switching Power Supply Circuit Diagram. The circuit 12 volt / 2 A switching power supply in the above scheme is not too complicated. At the output of this block provides a stable 12 V and maximum current 2A. Power supply units are quite compact and is suitable for debugging schemes, as well as a permanent resource for stationary devices, including power for the logic electronics for the home-made ​​CNC machine tools. 12 Volt / 2 A Switching Power Supply Circuit Diagram      Transformer is available in the free market and avoids the hassle of having to self-winding. The diode bridge BR 1 of any given voltage and current of 2A. All other elements in the high part of the circuit are designed by the same voltage, taking into account the mains. The scheme of 12 volt / 2 A switching power supply operates from the high voltage network, to be observed when mounting accuracy and caution when using. It is desirable to block the finished board to “pa...

L296 is a high current switching regulator that can provide up to 4 ampere current and its output voltage range is from 5.1v to 50v. For more information concern its datasheet. Power supply current can be adjust by changing the value of P1 pot. P2 and P3 pots are used to vary the output voltage. C7-C10 capacitors are used for input voltage filtering whereas C2-C6 are for output voltage filtering purpose.  Output voltage can be taken across X1-1 and X1-2 terminals or either X1-2 and X1-3 terminals. Note that the maximum input voltage of L296 is 50v so we have to step down ac voltage by using 50v 4amp or appropriate transformer. Don't forget to use heat sink for L296. Schematic: Final Assembly:   Components Required: R1,R3,       10kΩ  Resistor R2,            15kΩ  Resistor R4,            3.2kΩ Resistor R5(R6),     0.1Ω ...

The switching regulator power supply used LM2575-5.0 on this schematic. You can make the stable voltage by using the 3 terminal regulator like LM317. However, because the output electric current and the inputted electric current are the same approximately, the difference between the input electric power (The input voltage x The input electric current) and the output power (The output voltage x The output current) is consumed as the heat with the regulator. Because it is, the efficiency isn�t good. Data sheet for LM2575 SIMPLE SWITCHER 1A Step-Down Voltage Regulator http://www.national.com/pf/LM/LM2575.htm