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.

nº967

 

Simple heads or tails game with 2 transistors; slow decay; supply 2xLR03.

nº966

 

Simple electronic game: the cross of fortune; probability that the crossing red-green led turns on is 4/100, supply 2xLR03.