A complete Baby 10 sequencer is shown in the schematic below. To make the sequencer more visually attractive (and give some feedback) LEDs are often also added to the output of the 4017. A diode in series with the variable resistor stops the outputs fighting against each other (in layman’s terms). To accomplish this variable resistors are connected to each of the output pins. As such, the 4017 does almost everything we need from a sequencer in a single IC! However, we want our sequencer to output a varying voltage which we can then use to generate differing tones. The 4017 takes an input clock signal then sequentially outputs a high pulse on each of 10 output pins. The circuit uses the 4017, a simple CMOS decade counter. The Baby 10 was originally published in a column called “Captain’s Analog”, but has now been widely shared online. It’s easy to understand the basic operation of the circuit and produces a satisfyingly entertaining result. While the concept is simple, it can produce awesome results:Ī basic sequencer is a great beginners project.
These control voltages (CV) can then be use to control other components. Sequencers produce, a sequence of varying voltages. In this article I’ll introduce its basic operation, and the builds of some awesome hackers based on this design. This has led me to the Baby10, a classic and simple analog sequencer design. Recently I’ve been learning more about classic analog music synthesizers and sequencers.
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