The key feature of this chip is to create unique siren sounds such as Ambulance, Police, machine gun, and Fire brigade siren sound. This particular IC contains a tone oscillator along with tune range hooks, plus its a cheap IC primarily intended for toy vehicle purposes. The building of this circuit can be carried out using some fundamental electronic and electric parts. For instance, a simple siren generator could be constructed with a single outer resistor in addition to a loudspeaker driver transistor.
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The key feature of this chip is to create unique siren sounds such as Ambulance, Police, machine gun, and Fire brigade siren sound. This particular IC contains a tone oscillator along with tune range hooks, plus its a cheap IC primarily intended for toy vehicle purposes.
The building of this circuit can be carried out using some fundamental electronic and electric parts. For instance, a simple siren generator could be constructed with a single outer resistor in addition to a loudspeaker driver transistor. This short article talks about a summary of the sound generator IC UM A sleek and stylish audio component could be designed with just a few extra parts. There exists a tone generator within UM, that is capable of producing various types of musical tones through the oscillator clock and depending on the information written by the ROM.
Every single data saved in the ROM compares to every tone and this could be selected through the use of the address of the data location. The output current of UM is 3mA.
This IC contains an oscillator circuit whose frequency could be governed with the resistor attached outwardly to the 1st oscillator or pin7 along with oscillator2 or pin8. As a result, the amplitudes that are generated is going to be transferred to a control circuit. This circuit could be implemented with respect to the selection of music tone via the pin-6 and pin1. Because the audio may be weaker; an amplifier is necessary to obtain a high in volume tone. Therefore the sound could be increased with a single NPN-transistor.
The circuit of 4 siren sound generator using UM IC is indicated below. This is a low-power CMOS integrated circuit. This circuit can easily be used for just about any form of audio generation preferences. For example, the produced sounds can be utilized as alarm circuit, tone generator, and siren circuit etc. UM Circuit Diagram The developing of this circuit can be carried out using simple electronic components and a 3V battery pack.
It is ideal for several low voltage programs. The UM can easily operate a piezo without resorting to any kind of stage of amplification. Within this circuit, just one transistor amplifier is employed to operate an 8-ohm speaker. Moreover, for additional volume of audio, the LM amplifier may be used in this particular circuit.
UM3561 Three Siren Sound Generator IC
Datasheet UM is an 8-pin low power sound generator chip consisting of a programmed mask ROM and a tone generator. The tone generator produces different tones depending on the information written by the ROM. This low-power and low-cost chip is suitable for simulating siren sounds in alarm circuits and toys. Additionally, we can attach an external speaker through a bypassing transistor. UM Pinout Diagram The pinout diagram shows that it has two selection pins that we use to select a tone. Refer to the pin configuration section for details of each pin. Pin Description UM consists of an oscillator and a selector circuit.
UM3561 Three Siren Sound Generator IC
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.
UM3561 Three siren sound generator
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. However, the diode ROM array would require a lot of transistors and a lot of diodes around 30, transistors and an uncountable number of diodes. This is because an audio signal is between and hertz for a typical siren.