Sujet : Re: Low voltage zener diodes
De : jl (at) *nospam* glen--canyon.com (john larkin)
Groupes : sci.electronics.designDate : 08. Oct 2024, 19:20:51
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <hrtagjh8d5gjsn8aoebagakakclm612qsv@4ax.com>
References : 1 2
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On Tue, 8 Oct 2024 11:46:04 +0200, Arie de Muijnck <
noreply@ademu.nl>
wrote:
On 2024-10-08 11:24, Pimpom wrote:
When I tested some low voltage zener diodes (<<5V) 30-40 years ago, I found that they didn't have even a reasonably sharp knee, behaving more like LEDs in forward mode, maybe worse. Do I remember correctly? Are they still the same?
>
Often, below 3V3, they were just a series chain of normal diodes.
Nowadays a LED, with a sharp knee, works better if the voltage matches.
Just beware using them at very low currents - they are light sensitive.
>
Arie
An LED and a bipolar transistor and a source resistor can make a
near-zero tempco current source. With free light!
Re: Low voltage zener diodes