nº874

Bip-bip alarm with 1 NE555 timer, supply 5V

nº873

Minimalist buzzer with 1 NE555 timer + 1 resistor + 1 piezoelectric speaker, supply 5V

nº872

Simple 1 transistor red led bar with 2 operating modes: oscillating / permanently ON; supply 12V

nº871

Simple led ring oscillator with 7 stages, supply 230Vac/50Hz

nº870

Very low frequency oscillator with 1 transistor drives 12V/5W incandescent bulb with low value timing capacitors, supply 12V

nº869

Blinking mini incandescent lamp(3V) with 1 bipolar transistor, supply 1xNiMH

nº868

Minimalist mini incandescent lamp sequencer, supply 12V

nº867

Variable voltage divider

nº866

Up and down fading of 12V/5W incandescent lamp with 1 bipolar transistor, supply 12V

nº865