Category Archives: Sheme

BIKE FLASHER

BIKE FLASHER – Amazing! This bike flasher uses a single transistor to flash two white LEDs from a single cell. And it has no core for the transformer – just AIR! All Joule Thief circuits you have seen, use a ferrite rod or toroid (doughnut)

BIKE FLASHER 4.5V

BIKE FLASHER This circuit will flash a white LED (or 2,3 4 LEDs in parallel) at 2.7Hz, suitable for the rear light on a bike.   Source: http://www.talkingelectronics.com

12v RELAY ON 6V SUPPLY

12v RELAY ON 6V SUPPLY This circuit allows a 12v relay to operate on a 6v or 9v supply. Most 12v relays need about 12v to “pull-in” but will “hold” on about 6v. The 220u charges via the 2k2 and bottom diode. When an input

3V WHITE LED FLASHER

3v WHITE LED FLASHER This will flash a white LED, on 3v supply and produce a very bright flash. The circuit produces a voltage higher than 5v if the LED is not in circuit but the LED limits the voltage to its characteristic voltage of

1.5V LED FLASHER

1.5V LED FLASHER This will flash a LED, using a single 1.5v cell. It may even flash a white LED even though this type of LED needs about 3.2v to 3.6v for operation. The circuit takes about 2mA but produces a very bright flash. My

LM2596S DC 5V-36V to DC 1.5V-33V Step down converter

U1- LM2596s C1- 50V 100uF kondezator C2- 35V 220uF kondezator C3- 0.1uF (104) kondenzator C4- 0.1uF (104) kondenzator D1- 3.0 A Schottky Barrier Rectifiers D2- led dioda L2- 47uH induktor (470) R1- 1KΩ otpornik R3-  330Ω otpornik RV1- 10KΩ Podesivi otpornik

Precizno napajanje 0-30V, 0-3A

0-30 VDC STABILIZED POWER SUPPLY WITH CURRENT CONTROL 0.002-3 A ALL INFO ON SOURCE PAGE: ELECTRONICS-LAB.COM Input Voltage: ……………. 24 VAC Input Current: ……………. 3 A (max) Output Voltage: …………. 0-30 V adjustable Output Current: …………. 2 mA-3 A adjustable Output Voltage Ripple: …. 0.01

Podešavajući DC-DC Konverter (Step Up Converter)

U1 LT1370HVCT7 il slican (step up/ step down regulator) C1,C5- 470uF 50V C2,C6- 10uF C3- 47nF C4- 4.7nF L1- 10uH D1- STPS5L60 ili slicno R1- 2k R2,R3- 390ohm R4- 10k Ulazni napon od 5V nadalje, izlazni 30V  

Podešavajući DC-DC Konverter (Step Down Converter)

U1 LM2678T-ADJ C1- 220uF 50V C2- 10uf C3- 10nF C4- 1000uF 50V C5- 10uF D1- 60V 5A SCHOTTKY Dioda (STPS5L60 ili slicno) L1- 22uH 6A R1,R2- 1kOhm R3- 10kOhm Ulazni napon je 30volti maksimalno, a izlazni je od 2.5v do 14v 3A

Jednostavni Termostat sa dva tranzistora

  Parts List: Part Description Radio Shack # DigiKey # Notes R1  1K resistor  brown black red gold R2  1K, NTC R3  10K resistor  black brown orange gold P1  10K trim pot  bourns, multi-turn D1  Led, red  Light Emitting Diode D2  1N4148 diode  276-1101  1N4148DICT-ND

Regulator struje (Booster)

Volt regulators such as the LM708, and LM317 series (and others) sometimes need to provide a little bit more current then they actually can handle. If that is the case, this little circuit can help out. A power transistor such as the 2N3772 or similar