Little heart on LEDs. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Color and music installations, garlands
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The switching of the LEDs is controlled by the DD2 chip (serial shift register). The pulses necessary for the correct operation of the DD2 chip are generated by the DD1 chip. The clock pulse generator is made on the elements DD1.1...DD1.3 chip DD1. The operating frequency of the generator is determined by the values of the resistor R1 and capacitor C1. Element DD1.4 is designed to change the on-off sequence of the LEDs. Resistors R2...R9 limit the output current of the DD2 chip and LEDs. Diode VD1 protects the device from failure if the power supply is connected incorrectly.
R1-1 Mom
R2-680 Ohm
R3 R4 R5 R8-560 Ohm
R6 R7-100 ohm R9-470 ohm
C1-0.1 MK VD1-1N400
DD1-CD4069B (1561ЛН4, 74С04)
DD2-4094 (K561PR1)
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