Shared Projects

v2.2 Option II: DMN & DMP push pull

v2.2, Option 1 (12V transmitter)

16-pin to 9-pin joystick adapter for Apple II

Idea taken from this thread but since I sometimes needed to switch two frequencies, I made this. Example where it is usable, is when a PSX/PS1/PSone switches between NTSC and PAL, it needs to switch both the carrier frequency of the video signal AND the clock frequency to the GPU/DAC to have a proper video signal, that doesn’t go black and white and so on. This version is functionally identical to initial revision, but 4,3mm more narrow.

Parts list

• U1 1.8V LDO Regulator, here a TPS78218 (Mouser P/N: 595-TPS78218DDCT)
• U2 Texas Instruments CDCE925 (Mouser P/N: 595-CDCE925PWR)
• C1 1uF 0603 SMD capacitor
• C2 1uF 0603 SMD capacitor
• C3 1uF 0603 SMD capacitor
• C4 1uF 0603 SMD capacitor
• R1 10K 0603 SMD resistor
• R2 10K 0603 SMD resistor
• R3 18R 0603 SMD resistor (or whatever needed to accomodate signal to the circuit)
• R4 18R 0603 SMD resistor (or whatever needed to accomodate signal to the circuit)
• Y1 27MHz crystal (Mouser P/N: 774-ATS270BSM-1E or the shallower 815-ABLS3-27MD4YFT)

Use 0.8 mm substrate for the most shallow profile.

Note that Y2 and Y4 are parallel coupled, same with Y3 and Y5. Thus if programming with TI’s ClockPro software, Y4 must be tri-stated when Y2 output is on, and Y5 should be tri-stated when Y3 is on. Of course also vice-versa.

More info here

UNTESTED

little breakout for the 14 pin variant of the st7735 screens. these ones have the horseshoe shape ribbon cable. R2 is an 0805 size 10 ohm resistor

any questions hit me up, [email protected]

RJ11/RJ12 breakout board for breadboard projects.

The neo:bit is an add-on board for connecting NeoPixels to a BBC micro:bit. It gives you:

• A level shifter connected to pin P0 for driving NeoPixels.
• Two slide potentiometers, connected to pins P1 and P2.
• A barrel connector for a 5V power supply, which powers the NeoPixels, and can also power the micro:bit via a 3.3V regulator.

Licensed under CC-BY-SA 4.0. More documentation, BOM, and KiCad source files available on GitHub.

Note: A newer version of this board is available.

A revision B that is physically smaller, but functionally identical here

Idea taken from https://nfggames.com/forum2/index.php?topic=5744.0 but since I sometimes needed to switch two frequencies, I made this. Example where it is usable, is when a PSX switches between NTSC and PAL, it needs to switch both the carrier frequency of the video signal AND the clock frequency to the DAC to have a proper video signal that doesn’t go black and white and so on.

Parts list:

• U1 1.8V LDO Regulator, here a TPS78218 (Mouser P/N: 595-TPS78218DDCT)
• U2 Texas Instruments CDCE925 (Mouser P/N: 595-CDCE925PWR)
• C1 1uF 0603 SMD capacitor
• C2 1uF 0603 SMD capacitor
• C3 1uF 0603 SMD capacitor
• C4 1uF 0603 SMD capacitor
• R1 10K 0603 SMD resistor
• R2 10K 0603 SMD resistor
• R3 18R 0603 SMD resistor (or whatever needed to accomodate signal to the circuit)
• R4 18R 0603 SMD resistor (or whatever needed to accomodate signal to the circuit)
• Y1 27MHz crystal ((Mouser P/N: 774-ATS270BSM-1E or the shallower 815-ABLS3-27MD4YFT)

Use 0.8mm substrate for a shallow profile.

Note that Y2 and Y4 are parallel coupled, same with Y3 and Y5. Thus if programming with TI’s ClockPro software, Y4 must be tri-stated when Y2 output is on, and Y5 should be tri-stated when Y3 is on. Of course also vice-versa.

More info here

Automotive Teensy 3.6 with Dual CAN and prototype options. Untested. Free for non commercial use, Contact Otmar for other rights. Schematic, BOM and KiCad 5.0 source files at: http://cafeelectric.com/sharedProjects/smootherArchivev1_0/

This is my feeble attempt at making back button pads for a Gameboy Zero Build.

My thinking was to make something that would work for both a tactile button or a membrane style button setup.

If you are using a tactile switch/button you will need to insulate it from the pad.

Also I have no idea how to build PCBs so this is totally a stab in the dark. Proceed with caution….

SDR CardEdge Breakout PCB

Cysat 1 - Breakout board for the PicoZED SDR