Light-emitting diode pulse drive circuit using C-MOS NAND gate

The 4011B of the 4000 series is composed of 4AI NAND (NAND gate) gate circuits
, forming a 2-loop astable multivibrator. NAND gate 1 and NAND gate 2
are oscillator circuits with a large duty cycle of ikHz (determined according to usage requirements). By
chu connected in series with diode-D. A short pulse is generated with a period T of T: ￡. +￡. :
i.ic, (chua'chu2). The oscillator composed of
    NAND gate 3 and NAND gate 4 has an oscillation frequency of:
38kHz. This oscillator is added for the use of the remote control receiving circuit. If
c, 2iOOOpF,WUR:1/2.2caj=11.96kQ, The ffliokQln resistor can
be connected in series with the 5kO variable resistor V, and the oscillation frequency can be adjusted to 38kHL by VR.
Ran t is used to determine the current of the light-emitting diode, and the W1 value is determined according to the LEDRij rating.