nº902

"Knight Rider" led effect with 1 bipolar transistor, supply 12V.

nº901

Simple analog multiplying circuit: PROD=M1xM2 with M1,M2 between 0,00 and 1,00; supply 9V.

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.

nº894

Simple voice changer with 4 transistors, supply 2xNiMH.

nº893

Sound effect "deep breathing" with 4 transistors, supply 9V.

nº892

Yellow led driven by 1 bipolar transistor operates in 2 modes: irregular flickering or always on; supply 2xNiMH.

nº891

The clap latch with 3 bipolar transistors, supply 3V.

nº890

C-L-C oscillator with JFET transistor.

nº889

Wireless receiver activates wireless transmitter when they are closely aligned otherwise wireless transmitter sends a beacon with minimum current consumption, supply 1xNiMH.

nº888

Beep-Beep alarm with 1 transistor + 1 resistor + 1 LED + 2 capacitors, supply 12V.

nº887

Intermittent beacon for the MW band with 1 bipolar transistor, supply 2xNiMH.

nº886

Experimental alarm with 5 yellow leds and 1 bipolar transistor, supply 12V.

nº885

Beep-beep alarm with 1 bipolar transistor and 1 yellow led, supply 2xNiMH.

nº884

Smart cooling fan. Forced air flows to the side where temperature is higher, supply 12V.

nº883

Simple metal detector with 1 transistor operating in the MW radio band, supply 2xNiMH.