Shared Projects

HiFi Lid for the Kimchi Linux SBC from GroupGets

GPS Mezzanine based on the L80-R GPS Module. Please note this design is not tested so far.

PCB for the SquishBox, a Raspberry Pi-powered FluidSynth MIDI sound module. Plugs onto the Raspberry Pi GPIO header and provides a 16x2 character LCD, PCM5102 audio outputs, and two buttons. Can be 5V or 9V-powered.

Vintage LED sign, modern controller.

Z80-512K is an RC2014-compatible CPU and memory module, designed to run RomWBW firmware

Project’s GitHub repository: github.com/skiselev/Z80-512K

You can use this little board to adapt a Bourns 3296W (or Vishay T93YA) trimpot as a bias adjustment control in a tube amplifier. The bias supply from the amp goes to “B.IN” pad, bias supply out comes from the “B.OUT” pad, and the “G” pad goes to the main bias resistor to ground depending on the circuit. The resistor in parallel is an emergency pull-down resistor. I took this idea from the Valve Wizard. They write: “This ensures that if the pot wiper fails to make good contact with the rack (because it is dirty or worn out, say) the grid leaks will effectively be connected directly to the raw bias supply through R1 instead, biasing the valves safely cold. R1 should have a value of about ten times [the trim pot] so it has negligible effect on the rest of the design.”

Schematics, EAGLE and Gerber files, and other references here: https://drive.google.com/drive/folders/1CyXvsXiN4TgLzc1Nf8XQB_ZOHwcMmx7g?usp=sharing

Pretty much pulled from the datasheet and inspired by the circuitbenders.co.uk board.

BILL OF MATERIALS: - R1: 3 kOhm 1% Metal Film - C1: 0.1 uF 50v MLCC (C0G/NP0 or X7R) - I/O pads: either just wire or Phoenix 1729131 for terminals - Trim pot: Bourns 3296W-1-223LF (22 kOhm, 25k will work) - LTC1799 module - pads “2” and “3” go to a panel mount pot. You can use C100K or C500K for wider range of adjustment. I used this in an ART Multiverb and actually preferred the taper of audio/logarithmic pots over the reverse-log. If using the audio/log pot, run the wire from the pin 3 pad to pin 1 of the pot.

Here is a Mouser cart with all of the parts: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=683c34a120

Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/LTC1799.pdf Circuitbenders version: https://www.circuitbenders.co.uk/forsale/LTC/LTCPCB.html

MK1 Autopilot for a manned aircraft

The original design was done by Adrian West

here is the original post Here the source files Here

Best to go to his main website if you want to purchase one to support him

https://github.com/FujiNetWIFI/fujinet-hardware

Nice combination of short-range (0 - 10 cm, VL6180) and long-range (4 - 400 cm, VL53L1) ranging sensors both using time-of-flight. Intended to mount onto the Katydid wearable IoT platform.

Max1873 Laptop Battery Charge Controller with ATTiny85 Supervisor and Turn on/off digital latch

DC High Side Switch v1.1 - Should use 2oz Board

Uses low voltage NMOS to switch higher voltage PMOS so this is microcontroller friendly

30V 2.3A Max (higher depending on gate voltage and maybe small heatsink plastered to MOSFET package) Uses DMG6602SVTQ-7 P&N MOSFET in TSOT26-6 Package for switching

C1 = 10uF Tantalum Capacitor 1005 (2512)

IC1 = DMG6602SVTQ-7 (P&N MOSFET TSOT26-6)

R1 = 150 Ohm Resistor 0805

R2 = 100k Ohm Resistor 0805

R3 = 150 Ohm Resistor 0805

R4 = 33k Ohm Resistor 0805

R1 & R3 are protection (can go as low as 20 ohm). R2 is a pulldown to guarantee circuit is off if signal is left floating (keep high to reduce current draw and keep signal speed high). R4 limits amount of current flowing through NMOS (keep high to reduce current draw and keep signal speed high). Adjust resistors as needed. C1 is optional but is highly suggested to prevent voltage fluctuations especially if used in PWM application. Connectors are 2.54mm breadboard friendly. PWM speed is limited by R1 and gate capacitance. Use gate driver on signal pin if PWM speed exceeds microcontroller’s IO current/voltage capability.

Uses the following switch:

https://www.aliexpress.com/item/32853323091.html