On 17 Dec 2015 21:00, "Anders Wallin" <anders.e.e.wal...@gmail.com> wrote: > > First prototype assembled today, tested with 12 VDC SMPS wall-wart supply > and with 12 V lead-acid battery.
> Anders Is the lead acid battery supposed to be there so the unit continues to function if power is removed? If do, I believe that the choice of a lead acid battery is a poor one. I believe that even the sealed ones release very small amounts of sulphuric acid and when contained in equipment the acid results in damage in the long-term. I believe that people have reported damage to oscillators like the HP 10811A even on this list. I believe NiCd would be a better choice. That said I somewhere read they were banned in Europe but that might have been for general consumer use, as I note that they are still shipped in some products - e.g. sone emergency lights I bought in the UK from Farnell, although the lights were made in China. One can certainly still buy NiCd cells in Europe. I don't know if there is any simple way of slowly charging Lithium Metal Hydride batteries. Commercial chargers from reputable manufacturers have temperature sensors, voltage sensors and I assume a microprocessor to determine how to charge them and when to stop charging. You don't need to fast-charge a distribution amplifier, but I don't know if there's any relatively simple way of charging them. Dave. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
