Re: testing SFD1001 spindle speed

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Sat, 15 Feb 2025 18:14:59 +0100 Message-ID: <32ca208a-3eda-4791-b736-9641f44f4680_at_laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 2/15/25 00:21, Mike Stein wrote:
> I don't believe scale matters, just the number of bars per revolution; 
> centering is also not super-critical.
> 
> I've had one stuck on a filing cabinet for decades and still use it 
> occasionally.
> 
> You do need a lamp that flickers at 50 or 60Hz though.

Use a larger neon bulb in series with a diode. Without the diode you get 
100/120 Hz.

Or a few LEDs hooked up to an AC source, also with a single diode as 
rectifier.

  Gerrit