mousa

This circuit can detect the live AC wire. Can run it by 3 to 9v. You can add a buzzer to circuit. NOTE: don't touch the wires of the circuits for good detection. You can make similar to this circuit using IC4017 or IC4060

This circuit is an AC voltage detector that don't need to contact with the electric wire. It can run with 6 to 12v. NOTE: don't touch the wires in the circuit for good detection. You can make similar to this circuit by IC 4017 .

This circuit is a randomly flasher that can use as Christmas tree flasher you can add many LEDs in each branch can run it by 5 to 12v according to number of LEDs in each branch. 390 ohm resistor used to LEDs protection. Parts list: IC 4060 LEDs Capacitor 10nF(0.01uF) Resistor 390ohm Resistor 100K Resistor 2.2M Potentiometer 1M  

This circuit is a flasher circuit for Christmas tree. you can add many LEDs in each branch. can run it by 5 to 12v according to number of LEDs in each branch. Parts list: IC 4060 LEDs(11pcs) Resistor 100K Resistor 10K Capacitor 1nF  

This is an amazing circuit that can turn ON-OFF a LED or other load by clap. It also can use as anti theft system because have high sensitivity.

This circuit is a Sound detector that run a LED when detect voice. can use as voice level detector or anti theft system. the circuit can run by 6 to 12v.    

This circuit is an audio VU meter. it run by 6v to 12v. the sensitivity can change by the potentiometer. you can add more LEDs by adding further IC.

This circuit is a simple low battery level detector. It can use for 3v to 15v batteries. when the battery voltage drop to low voltage LED be turn ON. you can change the low voltage that you want to detect it by VR1, as you see in following video, i set it for detect 11.9v because i want to use 12v battery, so when the voltage of battery is more than 11.9v the LED still turn OFF.

By this circuit you can run a 4w fluorescence lamp by 1.5v. I test it for running 20w fluorescence lamp, it run but give low brightness . The transistor can be C2500 or 2N3055. You can find the chock coil from an old mobile charger or old camera or electric zapper. NOTE: the output voltage is up to 180v so is dangerous. Parts list: Transistor C2500 Resistor 270 ohm Chock coil of old camera or electric zapper or mobile charger Battery 1.5v AAA or AA LED

This circuit is a simple dc light switch. can run it by 5 to 12v (according to load) The sensitivity of circuit can change by P1. You can also make a light switch by 2 transistors . Parts list: IC555 LDR LED Potentiometer Resistor 200 ohm  

This is simplest live wire detector circuit.  It can run by 6 to 12v and consume low current. You can add a buzzer to the circuit. The areal must be a small wire with plastic shell. the circuit have high sensitivity.

This circuit is simplest IR remote control tester. It run by about 3v as minimum voltage but you can increase input voltage according to the load.  

This is a transformerless power supply circuit. it is cheap because the transformer in each power supply is most expensive part. The output voltage depend on zener diode. Output current about 160mA. you can increase the output current by increase the capacitor value. Note: don't touch the circuit when it connect to electricity. Parts list: Bridge diode 2A Zener diode 5v 1W LED Capacitor 2.2uF 400v Capacitor 470uF 100v Resistor 470k 1W Resistor 100 ohm 1W Resistor 220 ohm 1W Resistor 1k