Great value in that reminder Gaston; well done.
Another regulator arrangement that needs great care is this.
I have seen instances where the shunt regulator is designed to deal with the
expected change in current in the load.
For instance the load might always draw at least 70mA and never more than 100mA.
Should the load go open-circuit [or be unplugged] then the whole 100mA has to
flow in the regulator which in this case
was designed to only cope with 30mA plus a minimum current that allows
regulation to occur.
[Back in the 1970s I saw a zener supply let out the magic smoke.]
OT: but might apply to valve clocks. I have also seen screen bypass capacitors
rated for the screen voltage and not for the usually higher rail voltage.
When the valve is removed from the socket [or goes opencircuit] there is
supposedly no DC in the capcitor so the rail voltage appears across it.
In practice many capacitors survive because electrolytics are notorious for
conducting. [Obviously there are safety margins in ratings etc too.]
John Kaesehagen
----- Original Message -----
From: GastonP
To: neonixie-l
Sent: Friday, May 18, 2018 11:20 PM
Subject: Re: [neonixie-l] NL-50944 Infos?
Actually, in most if not all of the voltage regulator/voltage reference
tubes, at least a pair of the pins are used as security feature. This is just a
short circuit between two pins that are used to disconnect the output of the
power supply when the regulator is not in the socket to avoid unregulated high
voltage going into the load when the regulator/reference is not in.
It is interesting to see that very few of the new circuits that use this
voltage regulators do not make use of this security feature.
On Friday, May 18, 2018 at 3:02:32 AM UTC-3, Tomasz Kowalczyk wrote:
Voltage stabilizers use extra pins just for rigidness of internal structure
- they are essentially neon tubes, like nixies, but have larger working areas
to support currents varying between 5mA and 30-40mA. So their model has only
two electrodes, but as there are more present in the envelope, then why not use
them as extra mechanical support.
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