The UM3562 integrated circuit (not very easy to find) synthesizes three types of sound that correspond to the shots of Phaser, Gun Machine and Rifle fired by the "shot" pressure switch. The supply is made with a voltage of 3 V (two small batteries) and the transducer used is a small speaker. However, it is possible to use a larger amplifier stage (TDA2002 or TDA7020 for example) to excite other types of transducers with much more power, such as: a heavy speaker. The adjustment of the 'shot' is made from a trimpot and the selection of the sound is made using a 1-pole x 3-position switch.
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