[sdiy] Electronics International ETI-4600 History

Richard Wentk richard at wentk.com
Mon Jun 25 15:57:49 CEST 2018

It was based on an Australian design by (I think…) Trevor Marshall, and then serialised in ETI in the UK, and sold as a BOM with case hardware and panel by Maplin. (I’m not sure Maplin ever produced a complete boxed kit.)

It’s an unusual design. The VCOs are linear, and the switched capacitor filter has a limited sweep range. 

I played with one for a while once. The sound was fine, but interfacing with anything else was always going to be a nightmare. 

Maplin used to sell a book with all the construction details and circuits. You can probably find a PDF somewhere online if you try hard.

[Google] Turns out there’s a web site:

http://www.eti4600synthesiser.org.uk/ <http://www.eti4600synthesiser.org.uk/>


> On 25 Jun 2018, at 14:33, Chris Juried <cjuried at yahoo.com> wrote:
> Hi all,
> I was looking through some Electronics International magazines and came across the ETI-4600. Does anyone know the history behind the design of this synth?
> Sincerely,   
> Chris Juried  
> Audio Engineering Society (AES) Member  
> InfoComm-Recognized AV Technologist
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