How to connect up two built and tested EasyEDA projects to build a complete replacement 5VDC and 9VAC power supply for the Commodore 64.
The design uses the EasyEDA Automotive 12V to USB 5V 2A output power adapter and Precision Commodore 64 Computer Saver PSU
overvoltage protection PCBs connected together with a 115V + 115V to 9V + 9V mains transformer, a pair of bridge
rectifiers, two 470...
This project contains the non-simulation schematic, BoM and PCB design for the EasyEDA Uberclamp Overvoltage Protection Circuit.
The attached photo shows the circuit clamping at the designed clamp voltage of 6V, a 3V/ms 5V to 9.5V transient. The trace starts on the left with both input (yellow) and output (magenta) traces at 5V. The input and output then ramp up together at about 3V/ms until t...
The FreeLoad cartridge is a simple clone of an Epyx Fastload cartridge, offering a system reset button, a file access activity LED and a disable switch.
Parallel EEPROM Programmer for 28C64B and 28C256 featuring:
- GUI-based front-end written in Python,
- possibility to access the programmer via a serial monitor,
- hardware SPI at 8 MHz to control address bus via shift registers,
- utilizing the fast page write mode of the EEPROM,
- 1 Mbps serial interface via USB,
- binary data transmission.
Old cartridge for Commodore 64 it talking :)
![Thanks to JLCPCB.jpg](//image.easyeda.com/pullimage/YvMSGRgWN1bOEOnXqZJF3mFo2vBzwQChiz6Gz1h9.jpeg)
**WIP!** The circuit has been successfully tested on a breadboard, firmware exists. Will update here with all source codes when it's fully working.
This is my version of an USB SID adapter.
- plug in a original MOS8580 SID chip
- access it from the microcontroller
- interface with USB
The SID is directly connected to port B of the microcontroller, so one register write is sufficient. The DC boo...
# FINAL 3.33 by GWB #
This is version from GWB - links below
**Gerber files in attachments**