Mini electronic piano
Model of an electronic mini piano, with regulation of notes through potentiometers. 9V battery not included.
Interesting construction of a mini electronic piano with note regulation by potentiometers. The parts that regulate the frequency are capacitors and potentiometers.
This scheme is a standard application in which the variable resistances - the potentiometers - determine the pitch of the sounds. The resistance of 1MOhm between the base and the emitter of the BC548 transistor prevents the grinding noise that can appear on the keys that are not touched. On the other hand, this resistance reduces the current under vacuum with factor 100, since a switch is superfluous.
Work to be carried out on this model: mark, weld and assemble.
Measurements: 115 x 165 mm.
Construction to be done with tools.
|Construction time:||2-4 h.|