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Multiple sets of light-emitting diode lantern chain circuits with different flashing frequencies a
Source: InternetPublisher:aytwartoofyoroo Keywords: LED lantern MDASH Updated: 2020/05/15
It uses a multivibrator composed of a 555 time base integrated circuit
. Its oscillation frequency
is determined by Ri, R2 and Cl (such as group A), fo =1. 443/(RI+R2)Cl. The pulse signal output by pin 3 of Ai-A4 controls
the conduction and cut-off of the transistors VTi-VT4, that is, it controls the lighting and extinguishing of the light-emitting diode groups A, B, C, and D.
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