Sequence Dancing

Preamble

Following on from Atari Punx…, which was my first foray into the world of electronic sound generation, a sequencer is a very useful piece of additional kit. One can be easily made using a CD4017 decade counter (or CD4022 octal counter)… However, other ICs can be used, to provide additional functionality. For example, a CD4510/CD4516 BCD/Binary counter and a decoder or 16 channel multiplexer, such as a CD4028 or CD4067, can add up/down sequencing, pre-loading and other features.

Let’s take a look at all of these ICs as well as some others.

VCO, VCF and VCA circuits are also touched upon, be are covered more fully in Banging noises…

Continue reading Sequence Dancing

Atari Punx…

Preamble

A friend of mine, Pavel, from the group Bang Sue Electrix, told me about the Atari Punk Sound generator. I’d never heard of it before, and I initially thought that he wanted to re-create either an old Atari VCS games console, or Atari 800 PC. When he showed me the Wikipedia – Atari Punk Console page, I realised that he was actually referring to a Stepped Tone Generator, formed from an astable square wave oscillator driving a monostable oscillator, (or – if you prefer – an astable multivibrator circuit triggering a monostable multivibrator circuit) which uses two 555 timers (or a single 556 timer IC)…

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Reminiscent of vintage Atari video games, the synthesizer’s output is a characteristic Forrest Mims, a popular electronics author, published the original Atari Punk Console schematic for a “Sound Synthesizer” in Engineer’s Notebook: Integrated Circuit Applications   and then a “Stepped Tone Generator” in Engineer’s Mini-Notebook: 555 Circuits.  Kaustic Machines took the circuit and popularized their version as the “Atari Punk Console”.

This article looks at a the basic Atari Punk Console design, and then some variations, and improvements, upon the original design. Finally, it takes a look at replacing the 555 timers with some other multivibrators based around Schmitt triggers, BJT relaxation oscillator, and the oscillator taken from a Stylophone.

This article also takes a look at some unrelated 4069 musical projects…  and some random projects including an Auduino and a theramin.

See also Banging noises… and Sequence Dancing.

Continue reading Atari Punx…