W dniu piątek, 18 maja 2018 15:50:41 UTC+2 użytkownik GastonP napisał: > > 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. > > That's really simple and clever! I haven't thought about that. It seems soviet engineers did not, too, I have a piece (and have seen more pieces) from soviet military equipment and they connect only one electrode or wire up all electrodes of same type together.
John, valve amplifiers produced today fortunately implement capacitors able to survive all voltages present in circuit. At least last 10 or so designs I was looking into (with plan to build each one of them) had properly thought through voltage requirements. Which, by the way, brings one thing to my mind: many of nixie power supplies use SMD components. But how many of them take voltage rating of SMD resistors into account? I think I've seen few designs using 0805 resistors in feedback circuit, which (almost all of them) have only 150VDC rating, while the upper resistor in feedback divider will be seeing 170VDC or more all the time. Using two resistors in series would fix the problem, but first, the problem has to be noticed. On TME I could find only two resistors smaller than 1206 which are rated for voltages present in nixie PSU. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/590fe527-7b15-43ea-9ca8-632982cd3bd1%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
