i have opened a pest/animal repeller like a yardeen to look at the schematics
the trouble is 1 ic with 16 pins , pin 12 is vdd and i think 5 is vss, pin 1 is output to led
pin3 is input,pin6 input pin7 input ? pin 8 input
pin 9 output ? pin 10 output to flash leds, pin 15 output to piezo spreaker
also in circuit a
lm358 to dectect motion and a ht7530 for 3 volt stable input.
so what can the 16 pin ic be ?? it must be something of a ne 556 to make the block sound, but i can't find
a 16 pin ic with pin 12 vdd and pin 5 vss
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maybe picture ?