On Thursday, 23 April 2015 03:14:11 UTC+1, johnk wrote: > > > A similar 'nasty' can happen to experimenters - if multiple voltages are > required on a board, don't 'common up' at the bench supplies with only one > common taken to the board. Lifting that common causes the 'total' voltage > to distribute according to the various resistances - eg your 3V ICs could > get most of the 12V IC's voltage. > [If you are new to electronics, try some calculations. OR just take my > word for it.] > > Which is also why I don't like multi-phase mains distribution in houses. > Had to provide 'consultation' to a local hotel. The electrician put the > damage down to a 'mains spike'. He had lifted the Neutral at the main > switchboard as part of his RCD and compliance testing [he had added a new > run]. This meant that the large airconditioner [high current] and the > clocks/radios/tv/microwaves were in series across 415V line-to-line. > > John K > Australia >
This is something I had never considered - lifted neutral on a 3 phase supply to a property which (like mine) has 3 single phase distribution boards (one on each phase) feeding different parts of the house (makes power cuts on individual phases interesting). Will bear that in mind. Could be nasty as one dist board has mainly water heating and other low ohmic loads on it (and a solar PV system for added complexity). On Wednesday, April 22, 2015 at 9:56:59 AM UTC-7, threeneurons wrote: > > ... Another option, is just using common emitter transistor stages. <snip > schematic> I threw this little circuit together, last night, and scoped it. > Very good signals, on the scope, at 200KHz. I'm confident, it'll work as > high as 500Kbps. > Would that AC bypass cap on the input not skew the input signal / add phase shift depending on long sequences of 1s or 0s? What is its hidden purpose? -- 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/18618112-48e2-4e6f-ac6f-e1db58afe38e%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
