Programmable Sequenser
Programmable Sequencer
Courtesy/Thanks to: Elektor (1979)
Description: There are a variety of different ways in which the control voltages can be programmed and stored: e.g. via potentiometers, switches, sample-and-hold circuits or digital memories. The method adopted here is to encode the voltage digitally and store it in a RAM. When the contents of the memory are read out, they are fed to a D/A converter, which provides an analogue signal suitable for feeding to the synthesizer VCOs. In addition to the pitch of the notes (i.e. their frequency), their relative length can also be programmed. The duration of each note can be selected in the ratio of 1:2:4:8.
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