For 5vdc 1 amp, I am using a 7805 with a couple of caps -- 0.33 uF between the the input and ground, a 0.1 uF between the output and ground -- tied together on a bit of perf board which I place inside the APO3 power relay box. Or, if not using an APO3 I put the circuit into a 35mm film container. I don't remember what the total cost was, but it couldn't have been a lot as I ended up a drawer full of 78XXs.
On 1-Sep-09, at 3:30 PM, gsdatplace wrote: > --- In [email protected], Chris Kantarjiev <c...@...> wrote: >> >> I'm interested in packing a 5V buck converter into a DE-9 shell, to >> take 12V in and provide power to >> the attached GPS - typically 60-80mA, but it would be nice to >> handle the Nuvi's load of 400mA. >> >> Can anyone suggest a simple design or readily available unit? >> >> Thanks! >> >> 73 de chris K6DBG >> > > Simplest and cheapest I've found (and I bought everyone I could) > Duracell makes a beautifully tiny cigarette lighter to USB charger > adapter. 12V in, 5Vdc at up to 1A out. I've taken a couple apart > now, one is mounted inside my OT2 (like I said very small switching > supply) off the power control output which powers up and down my > nuvi based on profile switching or remote commands. Picked them up > for $6.99, I'm sure it must have been a pricing mistake (in my favour) > Belkin makes a tiny one as well. > http://www.reghardware.co.uk/2009/04/24/duracell_belkin_usb/ > > Garrett > VE6RKY -- Erich J. Ritzmann/VA3XTO
