HH2 -- first cut

[zenit52]

Hi Carl,
Thanks for your idea,
Please tell us about PIC source program in basic or c++ and PIC micro exactly what do in this HH2 circuit?
did we use the same PIC design for Deltapulse circuit ?
With best regards...

[Carl-NC]

One final note: Unlike HH1, I don't intend to offer PCBs for this project. It's just too time-consuming. But I will post Gerbers for anyone who wants to get a board made, and folks are welcomed to team up to cut costs, or even sell boards on their own. I recommend pcbcart.com for good quality cheap PCBs.

- Carl

[Carl-NC]

Please look over the schematic & layout and post feedback & suggestions. Keep in mind that this is not intended to be a cutting-edge design, but rather a circuit that introduces the use of a PIC for timing control. It is really meant for those who now understand PI basics, but have never used micros.

- Carl

[Carl-NC]

Here is the current layout:

[Carl-NC]

Here is a 150dpi GIF (PDF above is 300dpi):

[Carl-NC]

For the most part, HH2 is the same as HH1 except that the main 555 oscillator and 74221 chips have all been replaced with a PIC 12F683. Why did I chose this part? Because it is small (8 pins), and offers the option of trying out the ADC and PWM for audio generation.

Also, I did a few minor updates, namely adding a class B driver for the MOSFET, a drain diode on the MOSFET, and a feedback clamp diode. These should help those who are trying to wring out minimal sample delays.

- Carl