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This is a circuit for your Christmas star.Here LEDS are fading gradually.And If you are creative you can make a wonderful creation through this circuit.And I hope to give you more Christmas circuits.So try this Parts: C1 1µF 63V Polyester Capacito C2 100µF 25V Electrolytic Capacitor D1-D4 etc 5 or 3mm. LEDs IC1 LM358 Low Power Dual Op-amp R1,R2 4K7 1/4W Resistors R3 22K 1/4W Resistor R4 1M 1/4W Resistor R5 2M2 1/4W Carbon Trimmer R6,R10,R11,R14,R15 10K 1/4W Resistors R7,R8 47K 1/4W Carbon Trimmers R9,R13 27K 1/4W Resistors R12,R16 56R 1/4W Resistors Q1,Q2,Q4 BC327 45V 800mA PNP Transistors Q3,Q5,Q6 BC337 45V 800mA NPN Transistors SW1 SPST miniature Slider Switch Note # If you dont like to use trimmers, suggested values for a 9V supply are:R4=3M9, R9 & R13=47K and trimmers replaced by a short. # If you want to use 7 LEDs per strip R7 & R8 should be changed to 100K.and give 15v

This is a good news for the vehicle owners. Because This 22w audio amplifier works with 12v current.so you can use this one as an audio booster for your car set.And this circuit gets only 60w .so you can operate your circuit easily.when you operate this circuit use 4 ohm speakers.8 ohm also works.The circuit operates at 12 Volts at about 5 Amps at full volume.use a good heat sink for the chip. Parts U1 TDA1554 Two Channel Audio Amp Chip R1 39K 1/4 Watt Resistor C1,C2 10uf 25V Electrolytic Capacitor C3 100uf 25V Electrolytic Capacitor C4 47uf 25V Electrolytic Capacitor C5 0.1uf 25V Ceramic Capacitor C6 2200uf 25V Electrolytic Capacitor

Here I have introduce a new circuit through this you can switch off your bed room lamp with some delay.so I suppose this may be so useful circuit for you.and also after attaching a relay for this circuit you can use this as a delay circuit.This gives 15 second delay Parts: C1 330nF 400V Polyester Capacitor C2 100µF 25V Electrolytic Capacitor C3,C5 10nF 63V Polyester or Ceramic Capacitors C4 10µF 25V Electrolytic Capacitor R1 470R 1/2W Resistor R2 100K 1/4W Resistor R3 1M5 1/4W Resistor R4 1K 1/4W Resistor D1,D2 1N4007 1000V 1A Diodes D3 BZX79C10 10V 500mW Zener Diode D4 TIC206M 600V 4A TRIAC Q1 BC557 45V 100mA PNP Transistor IC1 7555 or TS555CN CMos Timer IC SW1 SPST Mains suited Switch Note # The delay time can be changed, changing R3 and/or C4 values. Taking C4=10µF, R3 increases timing with approx. 100K per second ratio. I.e. R3=1M Time=10 seconds, R3=1M8 Time=18 seconds. Do test and see it.

Lots of people ask about low voltage brightness control circuits so i believe this can be very useful circuit for you.I suppose you can use this for various purposes.So try this circuit... Parts: Q1 BD681 100V 4A NPN Darlington Transistor P1 470K Linear Potentiometer C1 22nF 63V Polyester Capacitor C2 100µF 25V Electrolytic Capacitor D1,D2 1N4148 75V 150mA Diodes IC1 7555 or TS555CN CMos Timer IC R1 10K 1/4W Resistor R2 47K 1/4W Resistor R3 1K5 1/4W Resistor LP1 1.5V 200mA Bulb SW1 SPST Switch B1 3V (Two 1.5V AA or AAA cells in series, etc.)

This is wonderful circuit for all because you can use this circuit to decorate your Christmas tree with 220v bulbs.So make a most attractive Christmas tree for this winter. Parts: C1 1000µF 25V Electrolytic Capacitor D1-D4 1N4007 1000V 1A Diodes D5 P0102D 400V 800mA SCR Q1 BC327 45V 800mA PNP Transistor Q2 BC337 45V 800mA NPN Transistor R1 100K 1/4W Resistor R2,R5 1K 1/4W Resistors R3,R6 470R 1/4W Resistors R4 12K 1/4W Resistor PL1 Male Mains plug SK1 Female Mains socket Note # You have to use high Gate-sensitive SCRs for the proper operation. # A recommended Triac type is the ubiquitous TIC206M (600V 4A) but many others can work.

I have introduce a knight rider light system before Lots of users ask more circuits so I did little bit changes and made this circuit.This circuit is based on Ic 4011 and IC40017.I haven't used NE555 IC here..In here you can see LEDs are chasing after one another.If you want to keep the LED on for a short time.give the current via 10uf capacitor.Then you can see LED is disappearing slowly. Parts: R2 100K Pot R3 1K 1/4W Resistor or 220Ohm if using blue LEDs C1 0.1uF 16V Ceramic Disk Capacitor R1 1 Meg 1/4W Resistor U1 4011 CMOS NAND Gate U2 4017 CMOS Counter LED1-10 LEDs Of Any Colour MISC Board, Sockets For ICs, Knob For R2 Note 1# You may need to use a lower value resistor if you wish to use blue LEDs. Use 220 Ohm. 2# If you plan to use this circuit in your car, be warned that in some areas it is illegal to have red, blue or yellow flashing lights unless you are an emergency vehicle. 3#C1 may be replaced with a larger value for a slower "chase rate". 4#If you have probl...

At present we can see most of people try to tap telephone line.So this is the circuit to avoid that matter.If some one disconnect the line The unit which attach to the LOAD will operate Parts:- Q1 2N3904 Transistor or 2N2222 Q2 2N3906 Transistor C1 0.47uF 250V Mylar Capicitor Q3 IRF510 Power MOSFET D1 1N914 Diode R1, R2, R3 22 Meg 1/4 W Resistor R4 2.2 Meg 1/4 W Resistor MISC Wire, Phone Connectors, Circiut Board