Reply Upvote Note for anyone wanting to replicate this without using a UM The UM IC datasheet specifically says that it uses a mask ROM which basically means it is not programmed electrically, rather it is "programmed" during chip exposure. This also means that it cannot be replaced easily with, for example, a timer. To do it make a shift register circuit in a decade counter configuration so that each clock cycle it activates the next address pin of a Diode-ROM array and turns off the previous one. Lastly, a selector circuit must be made to activate the different ROMs, and a DAC digital to analog converter must be added to convert the binary values into an analog signal.
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To begin with, R1 is connected to pin 7 and pin 8 of IC1. If the value of R1 lower will be high frequency up. Figure 1 The circuit diagram of The 4 sound effect using UM Then a choosing sound at appearing at the output will select with the connecting of both pin SEL1 pin 6 and pin SEL2 pin 1 either pin to positive or negative or all release.
If release pin 1 and pin 6 quietly the IC will emit the Police car sirens. If pin 6 SEL1 is connected to the positive position 2 we will hear the fire truck siren. But pin 6 is connected to a negative voltage position 3 will hear the Ambulance sirens. When we selected pin SEL1 or???? SEL2 then the controller circuit inside the IC will send a signal to control and command counter circuit to identify the location of data in memory. While sending data to the audio generator circuit. To make Tone of according to the data being recorded.
The tone will be sent to pin 3 of IC1, then it will be increased by both transistors Q1 and Q2 through R2. Which serves to limit current bias both transistor, the signal strength to be able to output sound to the speakers. Or If this sounds like a lot, It can be connected signal from pin 3 of IC1 goes into a high-gain amplifier circuit as needed. How to build. This project we can assemble them on the perforated board as Figure 2 because there are a few parts.
Figure 2 the component layout and wiring of 4 sound effect. Figure 3 The project successfully been installed on the PCB. I use a selector switch for select the sound output by I connecting wire as Figure 4 Figure 4 wiring the selector switch make we easy to choose tone output. Applications We can apply two AA 1. If everything is OK Would have heard the Police car sirens out for sure. Or can be modified in a theft or a kids toy.
It does not rule any As video below or Figure 5 is testing the projects The part list.
Siren Generation Using IC UM3561
Tojataxe When anyone presses the switch, the signals are provided to the base of the transistor T1. This switch, when hidden under the floor mat, triggers an alarm when the person walks over it. By using single IC UM we can build three siren sound generator circuit. This voltage is called Breakdown Voltage or Zener Knee voltage.
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