On Thu, Sep 20, 2012 at 05:31:42PM +0200, Gerrit Heitsch wrote: >When I replaced the 7805 in my C16 with a switching regulator (*) and >removed R10, the current before the regulator went down to 380mA when >supplied with regulated 9V, with the original supply, it was 280mA >since that is about 11V. This meant a LOT less heat in the box. >Combined with CMOS-EPROMs instead of NMOS-ROMs and heatsinks on CPU, >TED and PLA, I hope to have extended the livespan a fair bit. > > >(*) RECOM R-78B5.0-1.5 drop in for a 7805. RECOM recently introduced the cost-reduced E series that might work here too. On my bicycle-dynamo-to-5V circuit it did not work well, because I was feeding it too choppy voltage and it would only start up on every 4th to 10th half-wave. The R-785.0-0.5 works like a charm, with a tolerable ripple voltage (120mV at 4.4V when charging my phone). When connected to a more stable power supply, the ripple should be a few mV at most, and I guess the output would stay closer to 5V. Marko Message was sent through the cbm-hackers mailing listReceived on 2012-09-20 20:00:48
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