New toy – a Philips PCB80C552-5-16WP based single board computer.
The board is designed to have 64KBytes of EEPROM from 0×0000 to 0xFFFF, 32KB of SRAM from 0×0000 to 0x7FFF and 32KB of peripherals space from 0×8000 to 0xFFFF
On the same board I’ve placed a SPI RTC, EEPROM and 4.096 voltage reference for the on-chip ADC.
Just got a new toy, to start working on some interesting projects: an HP3466A almost my age, but still kicking
Here are some pictures:
This is a quick teardown and fix of a Chinese variable power supply.
While trying to measure a negative power supply I’ve discovered that the negative terminal was shorted to main’s earth and case
In this post i’ll show a quick walk-trough on how I managed to re-use an old Asus A6RP that had a sad ending.
In a few words, the entire case got smashed to plastic splinters. Luckily the internal components survived.
The case was rebuilt around two 4mm transparent acrylic sheets and 2.5mm pcb stand-offs, 10 and 15mm tall.
This is an update for the led lighting project.
The design in complete and the PCB’s are almost ready.
This is the schematic:
I’ve started a new project: a RGB led lighting module, that can be controlled from a central communication node.
I’ll be using some SMD rgb leds, in 5050 case, that i got from e-bay.
The Imax is specified to 40mA, but i’ll be running them at 30mA max, to keep the heat down.
The design features are :
- 50x50mm per module
- cheap controller, JTAG interface, enough cpu power for high resolution/ speed PWM
- the ability to run stand-alone, following a pre-programmed sequence
- RS485 line drivers
- wide input voltage range
Ca o prima postare am ales un proiect mai “aratos”: un ceas cu afisaj VFD
Pentru afisaj am folosit un tub IV-18:
Caracteristicile tubului sunt:
- 9 digiti, 8 cu 7 segmente si virgula, 1 cu simboluri speciale.
- tensiune de filament : 5V la 85mA
- tensiune anodica: 20-30V
- curent de grila: 11mA per digit
- curent anodic: 8mA per digit, cu toti anozii aprinsi
Mai multe informatii puteti gasi aici