[sdiy] current sink idea

[grant musictechnologiesgroup.com]

Excuse my ignorance here,

> I agree that would be asking for trouble.

Are we talking about noise, LED destruction,  photosensitive epilepsy (PSE) or what exactly?

GB


------ Original Message ------
From "Tom Wiltshire" <tom at electricdruid.net<mailto:tom at electricdruid.net>>
To "Mike Bryant" <mbryant at futurehorizons.com<mailto:mbryant at futurehorizons.com>>
Cc "synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>" <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Date 11/30/2024 8:16:54 AM
Subject Re: [sdiy] current sink idea

I think he meant instead of the DAC, not to drive the backlight directly. I agree that would be asking for trouble.

Roman mentioned using a PWM pin as a basic DAC followed with a simple RC and the current sink, and that should be fine.

On 30 Nov 2024, at 11:53, Mike Bryant <mbryant at futurehorizons.com<mailto:mbryant at futurehorizons.com>> wrote:

One problem is low cost displays aren't shielded so you'll transmit the PWM frequency everywhere

________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org<mailto:synth-diy-bounces at synth-diy.org>> on behalf of Gordonjcp <gordonjcp at gjcp.net<mailto:gordonjcp at gjcp.net>>
Sent: 30 November 2024 11:48
To: synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org> <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Subject: Re: [sdiy] current sink idea

On Sat, Nov 30, 2024 at 09:17:13AM +0100, Roman Sowa via Synth-diy wrote:
> with 2 days ago.
> Special needs require special solutions - I needed to control display's
> backlit intensity from internal DAC of the microcontroller, which

Immediate first question - why not use a PWM pin?

--
Gordonjcp

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From: Synth-diy <synth-diy-bounces at synth-diy.org<mailto:synth-diy-bounces at synth-diy.org>> on behalf of Gordonjcp <gordonjcp at gjcp.net<mailto:gordonjcp at gjcp.net>>
Sent: 30 November 2024 11:48
To: synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org> <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Subject: Re: [sdiy] current sink idea

On Sat, Nov 30, 2024 at 09:17:13AM +0100, Roman Sowa via Synth-diy wrote:
> with 2 days ago.
> Special needs require special solutions - I needed to control display's
> backlit intensity from internal DAC of the microcontroller, which

Immediate first question - why not use a PWM pin?

--
Gordonjcp

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