nº1018

20 green leds bidirectional bar, supply +5V_USB

 

nº1017

 

Minimalist phase-shift oscillator drives piezoelectric loudspeaker to make a simple buzzer, supply +5V_USB

nº1016

 

Minimalist phase-shift oscillator drives green led inserted in the feedback network, supply +5V_USB

nº1015

 

Squegging transistor negistor with blue led, 5 components, supply 12V

nº1014

 

Harvesting solar energy by 10 superbright 5mm yellow leds to run a low consumption led chaser. Although a small photovoltaic panel salvaged from an electronic calculator is being used in this demonstration, the leds themselves alone  will run the sequencer when the protoboard is exposed to direct sunlight. Superbright leds are required.