This be Mini Trombone Sound generator circuit. By using integrated circuit the number LM3909 of NS. In using loudspeaker 25 Ohm sizes work by use voltage from AA 1.5V battery. In sound occurrence that resemble with trombone.
It have the work depends on the principle uses voltage, which the generator by the occurrence Resonance of sound [...]
This circuit, you can create a siren has two characteristics, the automatic is a siren. Sirens and custom. The circuit uses CMOS nand gate digital IC number IC 4093 features Quad 2-Input NAND Schmitt Trigger makes it easy to use and very diverse. This circuit can be used with speakers or amplifiers to additional offline.
Principle [...]
This is a simple siren sound. Very noisy. ICs, Digital ICs are easy to use number CD4046 Inverter circuit.
Operation of the circuit when the circuit is connected to power. Frequency generator circuit starts, the cycle will be the second frequency generator set to a first set of IC1 / 1, R2, C2 generator frequency 1Hz.Output [...]
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