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   About Steve Bell
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Copyright © 2002-2008
Digital Design Ltd.

Time Zones for PCs
and Brushstrokes
are registered trademarks
of Digital Design Ltd.

Electronic Design

Steve Bell of Digital Design Ltd. has many years of experience in the design of digital electronics and microprocessor based systems. Specific areas of expertise include:

circuit design
programmable logic devices
PCB design, artwork, and assembly
rack mounted cards and systems

Circuit Design

all TTL and CMOS device families
Intel and Zilog microprocessors and support ICs
serial and parallel communications
memory arrays
displays: CRTs, LCDs, LED and fluorescent display types
keypads and keyboards
analog interface circuits: A/D, D/A, amplifiers, filters, comparators, opto-isolators, current loops etc.
output drive stages
power supplies

Microprocessors

Most of my current design work is built around the Intel 80X86 family of microprocessors. This family offers PC compatibility and good numeric processing capabilities. I have a large library of modular software available for use on these processors.

My earlier work was built around the Zilog Z80 family of microprocessors and peripheral ICs, including the Z80 SIO, PIO, CTC, SCC and CIO. Even today variants of the Z80 family such as the eZ80 still offers the lowest cost solution to many real-time embedded control applications. Modern eZ80 microcontrollers come complete with an ethernet port, IrDA, 1MB flash, 512KB SRAM, and a 50 MHz processor.

I will be happy to discuss which type of technology would be more suitable for your application and manufacturing cost requirements.

Programmable Logic Devices

I mainly use Altera Erasable Programmable Logic Devices (EPLDs) in my designs, and have invested in Altera development software and device programmers.

PCB Design

At Digital Design Ltd. printed circuits are designed using the Protel family of PCB CAD tools. This provides us with tooling for schematic capture, PCB layout, autorouting, design rule checking, and photoplotter output.

I can design for:

single sided, double sided or multilayer PTH boards
through hole or surface mount devices
ground and power planes
solder masks, and screen print layers

Usually the final PCB artwork is plotted by Gerber Photoplotter for best results during the manufacturing process.

Rack Mounted Cards and Systems

For harsh environments such as industrial control, aviation and marine applications I prefer to use rack-mounted VME or STE cards.

I have designed a number of cards conforming to the ANSI/IEEE 1000 specifications.
Please contact me for more details.
Rack-mounted Cards