electrialstandards

This circuit is an electric zapper that can convert 1.5v to very high voltage, so it can used as a fly killer. you have to connect two thin metal grid to the output exactly look like to commercial fly zapper. output voltage can reach to more than 2000v. You can use almost any other PNP transistor rather than S8550 and any other NPN transistor rather than S9013. The circuit run with 1.5v and consume 40mA to 100mA. Parts list: Transistor S9013 Transistor S8550 Resistor 30K Capacitor 100nF Capacitor 2uF 400v (8pcs) Diode 1N5408 (8pcs) Transformer 6v Battery 1.5v  Two thin metal grid

This circuit is a simple power inverter that convert 1.5v to high voltage. output voltage is lower than 150v but can run a small 220v AC lamp (not full luminance).  I test it to running a 5W LED lamp. the circuit draw about 100mA to 200mA from the battery. you can see how it work in following video. Parts list: Transistor BC547 Transistor BD140 Transformer 220v:6v Capacitor 100nF Resistor 30K Note: Since the output voltage have high frequency so maybe harmful for multimeter voltage tester.

This is simple wireless power transmission that used Arduino UNO and power transistor. You can use any NPN power transistor such as TIP122 or 2N3055 or 13003 ... etc. Both coils are air-core with similar diameter and similar turns number (30 turns - 2 inches diameter). The output voltage in second coil is alternating (AC) so you have to use bridge diode to convert that to DC. For coil making you can use the chock coils wire of CFL lamp. you can also find the NPN transistor in CFL lamp (usually 13001 or 13003). Parts list: Bridge diode 1A NPN power transistor Capacitor 47nF(2pcs) 30 turns 2 inches diameter air-core coil(2pcs) LED 1.5 to 9v battery Resistor 100R In following video you can see how it works: Code: void setup() { pinMode(13,OUTPUT); } void loop() { digitalWrite(13,HIGH); delay(0.5); digitalWrite(13,LOW); delay(0.5); }

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