Category: Oscilloscopes

  • Grandmaster Flash

    Last night I watched two more episodes of The Get Down on Netflix with my daughter. About 6 minutes into episode 3 of the first season where members of I think the Notorious gang visit Grandmaster Flash to show him the bootleg cassette, you see Flash sitting at a desk with a fat old 2 or maybe even 5-watt resistor and a multimeter. I think it’s a 2.7k ohm value(!).

    In the background, there are some signal generators and a big Tektronics oscilloscope. If you visit https://auction.screenbid.com/view-auctions/catalog/id/83/lot/56599/ you can see the actual prop currently being auctioned off. It’s a Tektronics 545A which was made between 1959-64.

    Grandmaster Flash’s Tinkering Machine according to the site auctioning props from ‘The Get Down’.

    The Smithsonian Institution has one of his actual turntables – a Technics SL-1200 MK2 model.

    The Technics turntable used by Grandmaster Flash aka Joseph Saddler

    The description mentions

    “Grandmaster Flash (Joseph Saddler), was born in Barbados in 1958. Growing up in the Bronx, he was influenced by his father’s massive record collection. As a teenager, Grandmaster Flash first experimented with DJ equipment and became involved in the New York DJ scene while attending daytime technical school courses in electronics. The innovations and techniques developed by Grandmaster Flash established him as one of the pioneers of hip-hop and deejaying.”

    A Guardian piece (https://www.theguardian.com/music/2016/aug/07/the-get-down-baz-luhrmann-grandmaster-flash-hip-hop) on the Get Down talks about Flash…  

    An electronics geek with scant funds, Flash constructed a stereo system using parts scavenged from scrapyards and discarded cars and asked the girls he dated if their parents had any records they didn’t want.

    This makes my walking a wheelbarrow around my 1960s middle-class neighbourhood as a 13-year-old gathering old discarded radios during council clean-ups quite tame, compared to the virtual war zone of the late 70s South Bronx.

  • Oscilloscope music

    The other day I was pottering around Facebook and stumbled across an amusing story via BBC News I think about a young couple who had decided to set themselves the challenge of visiting every one of the over 2,500 railway stations across Britain. I later discovered it’s connected to a Kickstarter project and has a website http://allthestations.co.uk. Reading some of the comments to the video – always a risky activity – I discovered a reference to the videos made by Geoff Marshall (of the same couple) exploring the secrets of the London underground and another youtube video – via https://www.youtube.com/user/geofftech2 – where he talks about cassette tapes. He also has a website at http://geofftech.co.uk.

    In the comments to this clip there were a number of pointers to another youtuber who focuses on old analogue technology called ‘Techmoan’ – https://www.youtube.com/user/Techmoan. One of the first videos of his I watched featured what Techmoan described as his holy grail of 1970s consumer electronics – something that featured both Nixie tubes and an oscilloscope to visualise the music – a bizarre old silver SAE hi fi amplifier you can see on https://www.youtube.com/watch?v=ZkCIdufSGS8.

    About half way through the video he demonstrated the way the small oscilloscope worked. Normal music resulted in an animated but pretty fuzzy trace jumping about the screen. Then he put some different audio into the amp and the oscilloscope which resulted in regular geometric images appearing on the small screen. Quite amazing! I was aware of the neat regular waveforms that can be created with different frequency ratios on the X and Y plates. The Australian ABC’s logo was created by using a 3 to 1 ratio many years ago. But what I was seeing on the screen was lightyears beyond that.

    He got a lot of comments pointing him to resources on oscilloscope music and a follow-up youtube video had pointers to a number of clips and sites, most notably Jerobeam Fenderson’s site at http://oscilloscopemusic.com.

    a random screengrab from one of Jerobeam Fenderson’s piece for oscilloscope music – planets

    You can view a number of his pieces on his Youtube channel – https://www.youtube.com/user/jerobeamfenderson1.

    Techmoan also provided links to an Oscilloscope Emulator for Windows, Mac & Linux https://asdfg.me/osci/ which works on my Mac and a Reddit Oscilloscope Music Page https://www.reddit.com/r/oscilloscopemusic/ with further links and info about this bizarre art form.

    Jerobeam Fenderson also offers a program to create oscilloscope music called OsciStudio via his website.