Shared Projects

Design for Ivant_Vape

ULX3S FPGA to AD/DA Converter Adapter Board

See: development branch:

https://github.com/gojimmypi/ulx3s-adda/

This board can replace the breadboard for mini projects 1-8.

Breaks out the 20 pins on an SFP optic from a UE75-A20-6000T connector to 0.1" header to aid in probing and reflashing EPROMs

Use modern bluetooth gamepads in your Commodore 64, Amiga, Atari ST.

15mm equidistant spacing between the To220 mounting holes - fits lovely onto most old PC CPU heatsinks. Conductive fixing holes on each end are 4.2mm diameter within exposed 10mm pads. Soldermask removed so you can solder real copper wires on to bolster the current carrying capacity. 1mm pullback/pad clearance throughout. All gates commoned together - but easily possibile to use a razor to split out into two fet pairs or even four individual ones. You can’t daisy chain these pcb’s directly together edge to edge with bolts (for example to get 8/12/16 fet combinations) - but could be a great timesaver if you just need to keep swapping banks of blown fets out!!! Tested in the field. Enjoy!

Amplifier circuit

Not quite so gigantic test board for TI’s LP5036 RGB led driver….and get the rgb led positions right.

http://www.laaudiofile.com/images/ac3cir1.gif

UCSC Senior Design

small general computing platform

Adapter board for connecting ESP32-POE and NFC board

Dual-Resonance Solid-State Tesla Coil 340VDC Bus Supply (from 120VAC only).

This version is designed to be used with large electrolytic capacitors, such as Cornell-Dubilier 500C series screw-terminal mount. The prototype circuit is using two 10,000uF 450VDC Cornell-Dubilier 500C series capacitors. Or optionally, you can use the DRSSTC Bus Caps V2 board to mount smaller, through-hole, bus caps to this board using 710-7461097 : Würth Terminals WP-BUFU Pin-Plate 16Pin Bush M6 180A.

This new version allows for either a circuit-breaker or a fuse, and has a completely redesigned digital soft-start circuit to suppress the inrush current at startup, but doing so without the extreme heat of an always in-circuit NTC component. It also switches to heatsinkable through-hole parts for the main diodes at a 30amp rating instead of 15amp.

NOTE: While this design works great as-is, depending on the size of your capacitor bank, consider bumping R18 from 100K up to 150K or so for a longer soft-start charge time.

This design replaces the older DRSSTC Bus Supply V1 version.

This is one of my favorite Forrest M. Mims, III designs from when I was a kid. The venerable LM3914 (meant for digital LED meter applications) and 2 other CMOS ICs drive a TIL305 5x7 LED dot matrix display to make a very simple toy oscilloscope. Even with the low resolution, one can clearly see waveforms like sine, triangle, and square waves. The sweep oscillator is 2 NAND gates wired in a loop with an RC network in the middle. Max frequency with the 100K pot and 0.1uF oscillator is around 1KHz.

Test board for TI’s LP5036 rgb led driver.

This is an update to the current shitty standard totem that could be found last year at DEFCON in such places as the back alley of Caesar’s Palace, trampled on the escalators, and even floating in the pool.

More info can be found here: https://hackaday.io/project/52950-shitty-add-ons