DATASHEET and Circuit Diagram

What follows below is the schematic of Flashlight Finder circuit diagram using the LM3909, a monolithic oscillator designed to flash Light Emitting Diodes (LEDs).

As seen in the above circuit: the LM3909, capacitor, and LED are installed in a white translucent cap on the flashlight’s back end. For flasher power, a contact strip is needed in addition to the case connection.

The following table shows the pin function descriptions of this LM2575 ‘buck converter’. The LM2575s known to be monolitic IC designed for a step down switching regulator. LM2575 used to be applied in applications for such Power Supply for Battery Chargers, Simple High-Efficiency Step-Down(Buck) Regulator, Pre-Regulator for Linear Regulators and more.

And here are The LM2575 Pinout and Function Description:
1. Vin : the positive input supply for the LM2575 step–down switching
regulator
2. Output : the emitter of the internal switch
3. Gnd : Circuit ground pin
4. Feedback : senses regulated output voltage to complete the feedback loop
5. ON/OFF : allows the switching regulator circuit to be shut down using logic level
signals

The LM2575 Switching Regulator Pin Functions and Datasheet continued »

The following schematic shows Increasing Output Voltage of a Fixed Linear Regulator Circuit Diagram using 3-terminal shunt regulators or references. The 3-terminal shunt regulators provide their precision function to turn the medium accuracy linear regulators into precision ones.

As shown in the circuit above, both the output voltage and its accuracy are performed by the TLV431, R1 and R2. The 5A output current, output current limiting, and thermal shutdown of the regulator’s features are still available whilst combining the best of both devices.

Increasing Output Voltage of a Fixed Linear Regulator Circuit Diagram continued »