LED TOURCH USING MAX 660

1. This is a simple LED torch circuit based on IC MAX660 from MAXIM semiconductors.
2. The MAX 660 is a CMOS type monolithic type voltage converter IC. 
3. The IC can easily drive three extra bright white LEDs.The LEDs are connected in parallel to the output pin 8 of the IC.
4. The circuit has good battery life. The switch S1 can be a push to ON switch.

   
   
   NOTES:-
   

   • Assemble the circuit on a general purpose PCB.

   • The IC must be mounted on a holder.

   • The circuit can be powered from two torch cells connected in series.

   • The capacitors C1 and C2 must be Tantalum type.

   • The diodes D1 to D3 must be of 1N4148.

   
   
   
   

   
   

CW PRACTICE OSILLATOR

1. 1. A circuit diagram that can be used for the generation of CW Morse code is shown here.
      
   2.  This circuit can be very useful those who would like practice Ham Radio.
   3.  The circuit is nothing but an astable multivibrator based on NE 555.The frequency of oscillations of the circuit depends on the components R1,R2 & C1.The circuit can be powered from a 9V PP3 battery. .

   
   
   
   
   

   NOTES:

   • The POT R2 can be used for frequency adjustments.

   • POT R3 can be used for volume adjustments.

   • The switch S1 can  be a Morse code key.

   
   

10V SWITCHING REGULATOR USING LM5007

1. The circuit diagram shown here is of a 10V switching regulator based on the LM5007 from National Semiconductors.
2. The LM5007 is an integrated step down switching regulator which has all necessary systems required for making a cost effective and reliable switching regulator circuit.
3. The IC is available in MSOP-8, LLp-8 packages and has a lot of  built in  features like thermal shut down, under voltage lock out, duty cycle limiting, current limiting etc.
4. The output voltage of this regulator can be adjusted using the resistor R3 and R4. 
5. OR the given values of R3 and R4 in the circuit diagram, the output voltage will be 10V.
6. he equation governing the output voltage is Vout = 2.5 x (R3+R4)/R4. Resistor R1 sets the switch on time and C4 is the boost boot strap capacitor.
7. Resistor R2 determines the variation of OFF time and C3 is a decoupling capacitor.

    NOTES:

• The supply voltage can be anything between 12 to 72V DC.
• Output voltage can be adjusted using R3 and R4.
• C1  and C5 are polyester capacitors.
• C1 and C2 must be rated at least 100V.
• R5 and C5 forms a filter network.
• The output current limit of LM5007 is 700mA.