Mini organ extension - synthesized sounds with the mini-organ

11-56 — elektor november 1982 mini-organ extension The heart of the mini-organ is the SAA 1900 integrated circuit. This IC contains almost the complete elec- tronic circuitry required for an elec- tronic organ. All 56 key contacts of the keyboard are directly connected to the IC via a 7 x 8 matrix. This means that 15 IC pins are already assigned. 4 pins are needed for the audio-fre- quency outputs, 2 pins for the power supply, 1 pin as a clock input, one more pin as a modulation input and, finally, a pin for the mode. The total is 24 pins which is the full extent of the IC"s terminals. It offers full polyphonic per- formance and good sound, but that is all. This extension changes the whole mini-organ extension synthesized sounds with the mini-organ Those of you who built the mini-organ last year will have had plenty of time to practise on the instrument and will no doubt have far surpassed its capabilities. The mini-organ is an electronic organ consisting of one single IC and a ...