December 15th, 2007

Added primary duty cycle and freq (manual adj) pots and did some preliminary testing with scope today.

pic -> arm7_pwm3f   pic -> arm7_pwm3F  pic -> arm7_pwm3F

December 14th, 2007

Finally got PWM3F output section built and debugged (had a bad solder joint on one resistor). Fired up ARM7 with PWM3F attached and away she went. Measured the three FET output frequencies and verified that each channel was receiving and putting out expected frequency - 100% perfect.

pic -> arm7_with_pwm3f   pic -> arm7_with_pwm3F_bit_darker

December 12th, 2007

Parts for PWM3F arrived today. Toroid winding not yet complete.

November 28th, 2007

Managed to get three LED's hooked up and flashing along with the 3 frequencies as the downloaded program was running. At the same time, Windows Hyperterm was used to view the application debug output and gave a dynamic status of what was happening. Ordered a PWM3F board from HydrogenGarage today and will build up the output section of that and use the external input facility that Bob included to hook up to the ARM7 and PWM_emulator software. Now to get a MicroMetals toroid core under way while waiting for the board.

November 27th, 2007

Have setup my ARM2103 and LCD screen on a perspex base ready for hookup to 5V power and RS232 for program download. Then will begin testing unit with output LED's initially with debug program supplied by aaajbell. The program environment supplied compiled up first time - lucky it wasn't supplied by Microsoft I'd probably be still trying to get it to work.

Hopefully this unit will take the place of all the other small 555/TL594 pulse generators I have lying around as I should be able to tailor the 'C' application to produce any sort of output I want (other than the current 3 freq combined). Have ordered a few ARM2103 accessories like 5V + 12V  power module ($7.85AU - can't build one for that), keypad ($6.52AU) and JTAG USB module ($46.42AU) for live application debugging.

I like the idea of being to order these cheap modules, download a program from the PC, hook up the interface board (to be done) and power supply and away you go. Might be able to add a small menu for the LCD and keypad (or just a few cursor keys) to allow a few user program adjustments and debugging facilities.

pic -> initial pwm emulator setup

November 4th, 2007

PWM Emulator project was initiated by aaajbell of Hydroxy Yahoo Group. The project revolves around the Philip LPC2103 uC surface mounted on an ARM2103 mini-board ($33.12AU from Futurelec.com.au). Hydroxy user aaajbell has to date provided open source 'C' source code, compiled code and preliminary output interface sketch. Another Hydroxy user scatslinger, is currently designing an output interface board that also allows feedback to the uC with the intention of auto-adjust to maintain cell/circuit  resonance.