nº987

 

Mains supplied roof light is turned-on only by fast switching action on the wall switch. As there is no need for extra stand-by power, the module can be integrated in a E27 lamp holder adapter unit.

nº986

 

Ultrasonic detector using standard electret condenser microphone. Conversion to audible range is achieved by frequency mixing with local oscillator, supply 3V

nº985

 

nº984

 

Analog capacitance meter 10nF-2200uF, supply 3V

nº983

 

"knight rider" with 10 leds, controlled by 1 bipolar transistor, supply 5V 

nº982

 

Led bar with 8 white leds, controlled by 1 transistor, supply 9V

nº981

 

Sensitive regenerative receiver for MW band (550kHz-1,65MHz) with 1 transistor; uses standard low impedance earphones (32+32 ohm), supply 3V.

nº980

 

1 transistor AM band regenerative receiver,loudspeaker output, supply 9V

nº979

 

Alternative dimmer without capacitors and trigger diode; 2 power control ranges: 25%-50% and 50%-100%; supply 230Vac/50Hz

nº978

 

Light activated red led astable multivibrator can be triggered at long distance by laser beam, supply 1xLi-ion cell

nº977

Breathing knight rider sequencer, 10 leds, 3 transistors, supply 12V

 

nº976

 

Mains supplied wheel of fortune with 6 dual leds.

nº975

 

Four stages fading sequencer. Two transistors per stage, supply +5V_USB.

nº974

 

Transistor phase-shift oscillator with 4 stages.(45º)

nº973

 

Self-quenching general purpose timer NE555N, supply +5V_USB

nº972

 

Self-quenching the simple 1 transistor RC phase-shift oscillator, supply 3xNiMH

nº971

 

The modified RF colpitts oscillator / The ultra audion oscillator.

nº970

 

Minimalist mains supplied led sequencer. Synchronization is achieved by using neon lamp. Only low voltage transistors are used.

nº969

 

Simple led ring oscillator, supply 230Vac/50Hz

nº968

 

Experimental VHF super-regenerative receiver compatible with airband. Two transistors. Super-regenerative detector based on 2SC2786. Earphones cable performs also as VHF antenna. Supply 3xR03.