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

Pete Hartman pete.hartman at gmail.com
Tue May 23 04:58:14 CEST 2023


Nonlinearcircuits

https://www.nonlinearcircuits.com/

Manufacturer and purveyor of fine Eurorack kits and so forth.



On Mon, May 22, 2023 at 9:20 PM Adam (synthDIY) <synthdiy at adambaby.com>
wrote:

> I don't know much about the CT-510
> I have an MT400 that has analogue drum sounds and a VCF, along with the
> usual square wave synthesis of many Casios around that time.
> The CZ-230s has PCM drum sounds and Phase Distortion synthesis doesn't it?
> So there wouldn't be much "analogue" on that board you'd think.
>
> What's "NLC"?
>
> A
>
> > On 23 May 2023, at 11:26 am, Benjamin Tremblay via Synth-diy <
> synth-diy at synth-diy.org> wrote:
> >
> > This topic could easily split two ways.
> > 1) the CT-510 is my practice dummy to get me in shape to fix the analog
> board on a Casio CZ-230s, a more interesting specimen.
> > 2) I have never built any NLC projects but spent an afternoon
> daydreaming about the LED-controlled Bong0 module. The idea of using glowy
> things to generate sound is intriguing. I love the rubbery flabby sound
> those modules make.
> >
> > Benjamin Tremblay
> >
> >> On May 22, 2023, at 9:03 PM, Benjamin Tremblay <btremblay at me.com>
> wrote:
> >>
> >> Here it is.
> >> <image0.jpeg>
> >>
> >>
> >> Benjamin Tremblay
> >>
> >>> On May 22, 2023, at 8:41 PM, Benjamin Tremblay <btremblay at me.com>
> wrote:
> >>>
> >>> Sorry if this is way way way off topic. I’m trying to fix this
> Casiotone keyboard and there are no schematics. The power supply seems to
> be putting out around 4 volts. The logic board runs but the 4558, 4066, and
> power amplifiers seem inert.
> >>> I’m trying to trace the power supply. Unlike most Casios from the 80s,
> the 5 volt regulator is just a zener diode, not a 7805. There’s one more
> non-zener diode on the board, and it’s faintly glowing red (!)
> >>> I know all diodes emit radiation when they are operating, but this one
> has such and led-red color.
> >>> Were such diodes ever used to indicate an overload on the board? I was
> more interested in fluorescent hair gel than power supplies  when this
> keyboard was made.
> >>> <image2.jpeg>
> >>>
> >>> (Lower left corner, a normal looking glass diode)
> >>> Benjamin Tremblay
> >
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