nº993

 

Random flashing led bar; individual stages controlled by SCR, supply 24V

nº992

 

Incandescent lamp flashes controlled by 1 optocoupler, supply +5V_USB

nº991

 

Bicolor led flashes controlled by 1 optocoupler, supply +5V_USB

nº990

 

Simple potentiometer tester with 3 transistors: 2 leds OFF: ok / 2 leds ON: defective wiper / 1 led ON: defective resistence element / Suitable for any resistance value; also tests sliding noise; supply 2xR03

nº989

Symmetrical astable multivibrator with two supply voltages. 

nº988

 

Simple transistor astable multivibrator with f_max/f_min>200, supply 230Vac/50Hz