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

René Schmitz synth at schmitzbits.de
Thu Jun 17 11:46:51 CEST 2021


Hi Roman,


I think he refers to what is called a negistor. The E-C path of a BJT 
can exhibit a negative dynamic resistance.

https://www.schematicsforfree.com/archive/file/Components/Semiconductors/Transistors/The%20Negistor.pdf


Best,

  René


Am 17.06.2021 um 10:51 schrieb Roman Sowa:
> 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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