nº943

Simple bargraph with dual red-green leds, supply 24V

nº942

The emitter coupled astable multivibrator

nº941

Overlap of two led sequences with 5 dual red-green leds, supply 12V

nº940

Minimalist reflex radio receiver for MW band; only ferrite antenna, no earth connection, no variable capacitor; tuning by variable inductor; 2 bipolar transistors; loudspeaker output, supply 1xNiMH

nº939

Mains power failure alarm with 2 transistors; stand-by current drawn from LR03 battery is less than 100uA

nº938

Simple SCR random led sequencer with 5 white leds, supply 24V

nº937

Knight rider led effect with 20 leds, 1 BC transistor, supply 24V

nº936

8 leds, 1 bipolar transistor, supply 9V

nº935

Simple led chaser with progressive shortening, supply 2xNiMH

nº934

Simple QC2.0 - 12V mode tester for USB charger. Checks if USB charger is true QC2.0