Shared Projects by WarHawk-AVG

SunnyBuddy-v1.3

2 layer board of 1.86x1.86 inches (47x47mm). $17.20 for three.

SparkFun Sunny Buddy - MPPT Solar Charger

Description: This is the Sunny Buddy, a maximum power point tracking (MPPT) solar charger for single-cell LiPo batteries. This MPPT solar charger provide you with the ability to get the most possible power out of your solar panel or other photovoltaic device and into a rechargable LiPo battery. Set-up is easy as well, just plug your solar panel into one side of the Sunny Buddy and your battery into the other and you are good to start charging!

The output of the Sunny Buddy is intended to charge a single polymer lithium ion cell. The load should be connected in parallel with the battery. By default, the Sunny Buddy comes set to a maximum charge current of 450mA with a maximum recommended input of 20V (minimum 6V). It’s recommended that batteries not be charged at greater than their capacity rating; thus, the smallest battery that should be charged with the Sunny Buddy is 450mAh.

Each Sunny Buddy comes equipped with a LT3652 power tracking 2A battery charging circuit and pre-installed barrel jack and 2-pin JST connectors with unpopulated areas to install your own personal 3.5mm screw terminals for added input/output options. This revision also adds a potentiometer to the input to set the holding voltage for MPPT and we’ve also tweeked the feedback resistors on the output to change the float voltage.

Or you can DIY in OSHPark purple ;)

LM2575-XX Buck Regulator

2 layer board of 0.63x1.32 inches (16x34mm). $4.15 for three.

Got the idea from here

More or less a LM7805 dropin replacement (maybe 40% larger) I designed it for maximum copper pour under the IC for heatsinking, got the initial design from here and just tweaked it out…there are commercial products that do the same thing, are smaller and more than likely much cheaper here and here and here My design is more or less for the DIY crowd…

By getting the 3.3v, 5v, or 12v LM2575 you can have different output voltage

LM2575 3.3v IC here , 5v IC here and 12v chips

C1 and C2 are 100 uF 153 CLV 0605 series metal SMD capacitors here

Inductor L1 is 330 uH DR127 here

Diode D1 is SOD123 here

LNA - PSA4-5043+

Another RTL-SDR low noise amplifier

I did a little tweaking on this for better solder mask and silk screening, but no functionality change whatsoever.

Original design Low noise RF amplifier with Mini-Circuits PSA4-5043 +

This design is more like the LNAforall build but a DIY version, depending if you want to use external power (up to 18 vdc as U1 is a voltage regulator, or it bias voltage from the RF cable depending on the components placed on the board [L1, L2, and C2)

to purchase PSA4-5043+

rtl-sdr-lna

2 layer board of 1.44x0.46 inches (36x12mm). $3.30 for three

I got the design for this low noise amplifier from The Hobbyists Guide To RTL-SDR - Carl Laufer.pdf , I attempted to reach the github owner thru his email but it failed…I made only a few minor changes, I extended the board a few mm, added a micro USB for power and changed the output to a edge SMA connector, everything else is the same so the BOM shouldn’t change all that much from the original design. For the DIY folks out there

BOM and example for construction in the below link

rtl-sdr-lna github repository

FM Trap

2 layer board of 1.19x0.4 inches (30x10mm). $2.35 for three.

I borrowed the design/idea from a blog by 9A4QV and designed this board, used to filter/block overpowering FM radio stations and help clean up recieve of RTL-SDR recievers…this is for all the DIY'ers out there

Complete information DIY “FM TRAP” or 88-108 MHz Band STOP filter

Example

2x 56pF capacitors (SMD 0805)

1x 22pF capacitor (SMD 0805)

2x 45nH inductance (2.5 turns, 0.35mm wire inner dia 5mm)

1x 126nH inductance (5 turns, 0.35mm wire inner dia 5mm)