Switch Mode Power Supply Design + laser cut/etched PCB

IMG_7582 IMG_7560 IMG_7559 IMG_7321 IMG_7319

Buck/Boost converter design for a solar glider I was working on last summer, at 16v it reached 98% peak efficiency and 95% average in boost mode. Also tried to make a linear power supply board using a laser engraver to cut away the copper, it worked pretty well to replace the normal ferric chloride etch step. Continue reading Switch Mode Power Supply Design + laser cut/etched PCB

DIY Doppler Radar – LNB Hack

I modified a satellite LNB to transmit as well as receive on 10ghz and connected the downconverted signal to my scope. I can use it to measure doppler shift and therefore speed of a moving object. I did the modifications by removing HEMT RF FETs and rotating them so their gate is where their drain was and vice versa. The source connections stayed grounded. I then had to cut some of the traces on the board and change a few resistors and things to make the biasing circuity work in reverse. I then capacitively coupled the dielectric resonant local oscillator the the transmitting section that I made. Watch Jeri Ellsworth’s Videos: https://www.youtube.com/watch?v=vDyo_OQFdAc

A similar mod can be done to use these as 10ghz ham radio transmitters: http://www.qsl.net/pa3gco/zelfbouw/blauwkap/bluecap.html

Mod closeup pic: http://sam.zeloof.xyz/wp-content/uploads/2017/01/IMG_8212.jpg


DIY Arduino Variable Lab Bench Power Supply 0-30v CC/CV

DIY Arduino lab bench power supply 0-30v 0-3a cv cc
PART 1: https://www.youtube.com/watch?v=3g-Vd9gIwZU
PART 2: https://www.youtube.com/watch?v=t8EfWlLJVXw
PART 3: https://www.youtube.com/watch?v=3DTpoN7AL14
PART 4: https://www.youtube.com/watch?v=FiBXrJ1YAZQ

This power supply can be built for less than $25 sans enclosure

Code: https://drive.google.com/file/d/0ByGyXp39rbHpZWZXSGd1MllGMXc/view?usp=sharing

Schematic: https://drive.google.com/folderview?id=0ByGyXp39rbHpaGMwWFJXVWdid3c&usp=sharing

Parts List: (see schematic)

Assorted resistors and capacitors (see schematic)
Optional: (see schematic)

Cool enclosure
Potentiometer knobs
Binding post output
Big heatsink for transistors