Homebrew_PCBs

Very cool. Leon uploaded pictures of his project. -Steve

http://groups.yahoo.com/group/Homebrew_PCBs/files/Leon/

From Leon:

Here are some of my home-made prototype PCBs. They were all made
conventionally with 1:1 transparencies produced on an LaserJet
IIIp,
positive resist exposed with UV, developed in NaOH and etched in
FeCl3.

MSP430.jpg is a little (about 1" square) DIL module
micro-controller
using a TI MSP430F1101 ultra-low-power MCU in the TSSOP package
(0.65 mm lead spacing). A 32 kHz watch crystal is mounted on the
underside. The module is plugged into a demo/programming PCB. The
JTAG connector used for programming and debugging the MCU is on the
right.

DDS_top.jpg and DDS_bottom.jpg are the top and bottom of a 7 Hz to
200 kHz sine/sawtooth/square wave software direct-digital
synthesiser using an Atmel AT90S2313 MCU.

Geo_top.jpg and Geo_bottom.jpg are the top and bottom of a geophone
(seismic sensor) interface. The geophone signal is amplified and
filtered using a low-noise op-amp. The signal is then digitised
using a 12-bit ADC interfaced to an AT90S2313 MCU and then sent to
a host PC via an RS-232 interface.

All PCBs were designed with Pulsonix: http://www.pulsonix.com

Leon Heller
leon_heller@...


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