[sdiy] Glowing diode on Casio CT-510 analog board?

The SynthiMuse synthimuse at gmail.com
Tue May 23 12:18:09 CEST 2023


I'd suggest that LED is used as part of the power supply regulation.
It probably had the forward turn-on voltage that the designers were looking
for.
I've only ever seen this used one other time in 50 years : in a Japanese
radio in the 80's
Gerry


On Tue, 23 May 2023, 11:09 Adam (synthDIY), <synthdiy at adambaby.com> wrote:

>
>
> > On 23 May 2023, at 5:52 pm, Roman Sowa <modular at go2.pl> wrote:
> >
> > If it glows, it is LED.
> > Those kind of early LEDs were used at least in one of the Korgs, Maybe
> Poly6 or Poly61, can't recall now, to indicate active voice.
> > I was shocked too when I saw them first.
> >
>
> Actually, my Jupiter 8 has internal LEDs which are activated by throwing
> the "test mode" switch. As you say, they indicate which voice board is
> sounding with each key press.
>
> A
>
>
>
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