info for ETI Maplin 4600 5600

[prof. Antonio Guerrieri]

Dear Ken,
thank you as lot for you suggestions and considerations.

>filters and no keyboard. Even so, it was fantastic to play with. I was
>driving it off an ETI Sequencer. I have since played with one of the VCFs,
ETI sequencer?! Never seen before but extremely interested. Could you help
or suggest me about its manual? Obviously, relevant information are welcome.

>Depending on where you got your filter pcbs from, beware a track that has
>gone missing off the artwork near the 4001(?). This was why the fiters in
>the one I played with didn't work.
Thanks. I hope that such an information can help other people involved in
the ETI construction.

>Add voltage control to the PWM part of the VCO. It's easy, but wasn't in the
>original 4600. (I don't know about the Maplin one.) I think the Maplin one
>also added sync, also a fairly simple mod.
Yes, I agree.  The 5600 (Maplin, not mor ETI) now add this feature as well
as for sync between VCOs.

> Winding data for the chokes is supplied in the 4600
>manual, and they are based on fairly common choke bodies (neosid?).
Yes, I realise before. Unfortunately, to be honeoust, I think to be not
able to make them. Do you know if some companies sell these items or at
least the choke bodies?


Thank again.
Best regards,

Antonio Guerrieri
ga026sci at pzuniv.unibas.it