nº839

The ferrite bead joules thief.

nº838

The RRC JT: A wire wound resistor transforms an RLC JT into a practical RRC JT.

nº837

Frequency adjustable blinking circuit based on RLC JT drives a low luminous intensity 10mm yellow led.

nº836

Incandescence lamp blinking with optocoupler.

nº835

CFL lamp blinking based on the simple photo-darlington relaxation oscillator, supply 230Vac/50Hz.

nº834

Led bar alternating between red and green. Conversion of dual leds into bipolar leds.

nº833

Simple photo-relay with pre-trigger indication.

nº832

Strobe incandescence lamp, supply 230Vac/50Hz.

nº831

Experimental LW receiver with 2 transistors, supply 2xNiMH.

nº830

nº829

Simple set-up to test and compare oscillation margin of quartz crystals based on Clapp-Gouriet oscillator, supply 9V.

nº828

Simple ball bouncing animation for oscilloscope, supply 2xNiMH.

nº827

Sound+led effect : "The ticking of the countdown clock"; supply 9V.

nº826

Random beep generator, supply 230Vac+9Vdc.

nº825

Simple frequency converter with 1 transistor: FM band (88-108MHz) into MW band, supply 9V.

nº824

Siren with 2 transistors and 2 modes: police siren + wailing siren; supply 12V.

nº823

Yet another simple way to couple inductors for a basic JT.