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Jack Purdum
It might be the DDS/VFO board we did for the QST article (March, 2015) on the Forty-9er. The only touchy thing about the buck converter was the Phillips head screw that adjusts the voltage which was easily torqued right off the board. Jack, W8TEE
On Friday, April 13, 2018, 1:59:02 PM EDT, Nick Kennedy <kennnick@...> wrote:
I used one that looks a lot like that on a project with a DDS and Arduino Nano. It was a hair smaller than a postage stamp. The input voltage came from 6-NiMh cells and the output is steady at 5 V. Efficiency is high too. From my notes: I tested the little regulator, which is the size of a postage stamp. While supplying 190 mA at 5 VDC with input voltage varying from 8.4 to 5.5 VDC the efficiency was 87% to 93%.? Over the expected range of 8.4 V to 6.3 V, it¡¯s 87% to 91%. It started to drop out at 5.4 volts input, but otherwise the output was rock steady over the input voltage range. It¡¯s rated for 5.5 V to 12 V input and 3A output. 72- Nick, WA5BDU On Fri, Apr 13, 2018 at 12:14 PM, chuck adams <chuck.adams.k7qo@...>
wrote: > Since I have to wait on the slow boat to test this, maybe one of you has > a similar item and can report to the group. > > Here is a DC-DC converter for down conversion and costs $0.79. > > > > I have no problem whatsoever with spending the $0.79 USD to try it > and I can, of course, find another use for the critter in powering 3.3V > DDS modules.? I just would have to wait 4 weeks for the critter to swim > across the Pacific ocean and maybe take a few days in KH6 land for DX. > > ?...? > > > Any one gone and played with one of these DC-DC converters in a > similar manner? > > chuck, k7qo > > > |
