- CHarge vs use battery - 2 Updates
| vjp2.at@at.BioStrategist.dot.dot.com: Mar 17 12:45PM How do you use diodes and capapcitors to switch a 4v power supply so it continuously charges a battery when not being used. I have an hp2621a terminal which had a battery to keep nonvolatile settings (eg baud rate, parity &c). I want a chargeable battery to keep those settings going but to charge when I have the machine on. Decades ago someone posted how to have a bike generator charge a capcitor so that when you brake, you can power a back red light. -- Vasos Panagiotopoulos panix.com/~vjp2/vasos.htm ---{Nothing herein constitutes advice. Everything fully disclaimed.}--- |
| "Peter W." <peterwieck33@gmail.com>: Mar 17 07:23AM -0700 > I have an hp2621a terminal which had a battery to keep nonvolatile settings > (eg baud rate, parity &c). I want a chargeable battery to keep those settings > going but to charge when I have the machine on. The issue that comes to mind is whether a/the power-supply would cause problems if connected to the terminal with or without the battery. If not, would an appropriate Zener diode do the trick? Peter Wieck Melrose Park, PA |
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