Pisca-pisca de led RGB com 1 transistor bipolar e selecção manual de cor, alimentação 3xLR6

 

 

Phase-shift oscillator with one BC558 transistor drives common cathode RGB led. Colour selection is manual. Supply 3xLR6

Flashes de led amarelo com 1 MOSFET, alimentação 1,5V

Led flashes with one MOSFET BSN10 supplied by a single LR6 1,5V battery. Regenerative feedback is achieved by led-led light coupling and voltage doubler in drain and gate circuit.

Princípio de funcionamento do multiplicador de corrente

Papel de parede para osciloscópio com 2 transístores, alimentação 2xNiMH AAA

 

 

A simple wallpaper for oscilloscope with 2 transistors, supply 2xNiMH AAA.

Flashes com led amarelo sem pilhas



15 led in photovoltaic mode charge the tank capacitor. When trigger voltage is reached the capacitor is discharged and the led flashes. Regenerative feedback is provided to improve triggering. Timing between flashes depends on the amount of light entering the leds. Very efficient circuit with 3 transistors and 1 capacitor only. There is no need for direct sunlight exposure. Daylight is enough to run the circuit.