nº900

Timing for the simple transistor astable multivibrator running in 2 possible modes.

nº899

Simple flashing controller for Christmas lights, supply 230Vac/50Hz.

nº898

Experimental TRF audion MW radio receiver: 1 transistor; loudspeaker output; about 10m wire antenna(and ferrite antenna) and PE connection. Receives during daylight MW Antena 1 with 630KHz carrier at about 30Km distance from transmitter; supply 24V.

nº897

Self-quenching oscillator with 1BJT, supply 2xNiMH.

nº896

Minimalist alarm siren: 1 resistor + 1 BJT + 1 blue led + 2 capacitors + 1 loudspeaker, supply 9V

nº895

Minimalist multivibrator for dual(red/green) led : 2 transistors + 1 trimmer potentiometer + 1 capacitor, supply 2xNiMH.