In general, the turning flashers in automobiles use thermal relays, and the flashing frequency depends on adjusting the spring pulling force or intermittent contact, which is difficult to adjust. Instead of using the circuit, the frequency is easy to adjust. liquid keychain wholesale,liquid keychain toy,moving liquid keychain,liquid keychain diy,custom liquid keychain,liquid keychain manufacturer Shenzhen Konchang Electronic Technology Co.,Ltd , https://www.konchang.com
As shown in the figure, lC1 and R2, RP1, C2 form an astable multivibrator, and the vibration frequency
f=1.44/(R2+RPl)C2
The oscillation frequency of the illustrated parameters is about 6 Hz to 600 Hz. Adjust RPl to make the display obvious. VTl and VT2 are the power boosting stages of the lights. The VT3, T1, R5, C4 and piezoelectric ceramic sheets HTD form a buzzer.