Sinhala Electronics Circuit - Rat repellent sound circuit
Channel: LAYAN ENGINEERING TECHNOLOGIES (PVT) LTD
Date: 2020-08-26

Sinhala Electronics Circuit  Rat repellent sound circuit.
NE 555 Frequency calculator 
https://ohmslawcalculator.com/555-astable-calculator
Component list
1) NE 555
2) 10nf ( 103 pf)
3) 1nf   ( 102 pf) 
4) 33K 
5) 15K
6) 10 ohms
7) Speaker