Make Police siren circuit using 555 timer, transistors and OP-Amp
This is police siren circuit using 555 IC, with PCB layout, using 2 IC-555 as frequency oscillators and transistor to drive sound to the speaker [...]
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May 17, 2017
Free 4 ideas of tone generator circuit using FET, SCR, transistors
This is simple Warble tone generator circuit , use scr as main of oscillator and signal will be boost, then feedback to SCR again. Output is 32 ohms speaker [....]
January 2, 2017
555 Siren sound Generator
Suitable for beginners. Build a simple, but widely applied.
August 8, 2013