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 is an infrared transmitters signal circuit that is small size and using a power supply 1.5V only. by main electronic part are two the LM3909 (a LED Flasher Oscillator IC) Normally, we tend to put it to use as a simple flashing light circuit. Using a 1.5V low power supply, it’s working now, Easier [...]
The following schematic is of the discrete component replacement for the LM3909.
The values of the components were chosen to match those in the integrated circuit however resistor R5 is a guesstimate fit as the Q2 portion of the circuit as Q2 in the integrated circuit is a “current mirror” which is a type of current [...]
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