[sdiy] Will clamping diode work when power is off?

Mike Bryant mbryant at futurehorizons.com
Thu Jun 17 11:48:45 CEST 2021


I don't think it would be cool.  It could honk at several hundred megahertz, depending on the L and C of the load.  A small capacitor from B to E will kill this tendancy.


-----Original Message-----
From: Roman Sowa [mailto:modular at go2.pl] 
Sent: 17 June 2021 09:51
To: Mike Bryant; synth-diy at synth-diy.org
Subject: Re: [sdiy] Will clamping diode work when power is off?

An oscillator?
Can you elaborate more?
That would be cool nifty oscillator, but I can't see it oscillating, no SCR here

Roman


W dniu 2021-06-16 o 18:59, Mike Bryant via Synth-diy pisze:
> It will clamp.  But it can also sometimes form a relaxation oscillator 
> with any capacitance on the output if there is an external voltage there.
> 
> *From:*Synth-diy [mailto:synth-diy-bounces at synth-diy.org] *On Behalf 
> Of *ShedSynth via Synth-diy
> *Sent:* 16 June 2021 17:52
> *To:* synth-diy at synth-diy.org
> *Subject:* Re: [sdiy] Will clamping diode work when power is off?
> 
> I hope you won't mind me exhuming my old question again.
> 
> My friend Tim suggested using a BC557 to actively clamp the input to 
> the supply rail:
> 
> https://shedsynth.files.wordpress.com/2021/06/adsr-a-schematic-gate-to
> -d2-2-2.png
> 





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