nº964

 

Simple whistling detector based on LM567, supply 6V

nº963

 

Simple alarm triggered by interrupting wire loop. 7 pcba components( 3 transistors + 2 resistors + 2 capacitors). Standby current consumption less than 1uA; supply 12V( 8xAA or AAA)

nº962

 

"Knight rider" led sequencer with 10 red leds driven by 1 transistor; supply 12V