Analog Pendulum circuit with the CD4017
Ultrasonic insect barrier with with CD4017
Eight-way e- Responder circuit (CD4043, LM386)
Digital lock circuit with CD4520
D -A converter with current output transforms the voltage (DAC0800)
Logic circuits with transistors
Monostable circuit with 555IC
NAND gate circuit with (CD4011)
D- A converter principle circuit with resistance
Speed digital random selection machine circuit