SESAME ELECTRONICS Pty Ltd

Unit 1, 19 Bestic St. Rockdale NSW 2216 AUSTRALIA.

sesame@sesame.com.au
0434 781 191

Sesame Electronics on LED

We make Printed Circuit Boards.

  • Any artwork format
  • One or many
  • Bare boards, or with parts supplied, assembled and soldered
  • Single-sided, double sided, or multi-layered
  • We can design a PCB from a schematic circuit
  • Low prices
  • Hobbyists and businesses welcome

Fully-featured boards:

We can supply high quality PCBs in any quantity. We can handle any artwork from which we can extract RS-274X Gerber files. Programs we commonly handle include Protel99SE, Protel98, CircuitMaker/TraxMaker, AutoTrax, DipTrace, Eagle, EasyPCB, FreePCB, Linux PCB, Fritzing, Kicad, ExpressPCB. We can extract gerber files from ExpressPCB. We accept files that we can read by any downloadable program. The boards can have minimum track/space 6thou, smallest drill size 0.35mm, and multiple layers. They can have all the features, such as plated-through holes, solder masks, silkscreens, gold-plating etc. These are top quality boards. Delivery within two weeks. Email us for a quote..

We accept payment by direct deposit, or with credit card via PayPal. Paypal is a free internet bank through which you can pay anyone who has an e-mail address without telling them your credit card details. You only tell PayPal your credit card details when you register.

Copper-only prototypes:

As well as the fully-featured machine made boards above we can supply copper-only prototypes, single or double sided at a fraction of the cost. We hand etch the artwork and hand drill the holes. We leave the uv resist on the boards to protect the copper. It's better to solder through it, but it can be removed with metho.

For a prototype you don't need the overlay, you know where the parts go. As you are hand soldering you don't need solder masks, any excess solder can be removed with solderwick.

We can make such a PCB if you supply us with a file, or with a scan of a PCB layout. We can handle common computer formats, such as AutoCAD, CorelDraw, Paint, bmp, gif, tif, pdf, cdr etc. We make boards from Silicon Chip, or other electronic magazines, or from a print.

For such prototypes we don't need Gerber files, we make the boards from pdfs of the artwork. If we can print your artwork we can make your board.

We print the artwork at 2400dpi, and we project the pads onto crosshairs on the computer screen for accurate drilling.

Some suggestions for designers:

Align components horizontally and vertically.

Group together similar components where possible, such as resistors, caps, ICs. It looks better.

Show the boundaries of the board.

Show the filename on a copper layer.

Tracks should all be at 90 deg or 45 deg, other angles look bad.

Handmade boards are best designed with larger tracks, clearances, and pads than machine made boards, as follows.

Track widths: Use .024" for normal signals, with .026" separation. This places them on a .050" grid. They can narrow to .012" where they pass between pads. Make the power and ground busses .030" or wider. Use minimum track widths and clearances .012".

Holes should be pin size + 0.2mm. Use holes in multiples of 0.1mm, smallest hole 0.8mm.

Pads should be hole-size x 2.25. It works out that a 0.8mm hole gets a 70thou pad, 0.9mm hole a 80thou pad, 1.0mm hole a 90thou pad, and so on.

Place all pads and components on the grid where possible. Use a grid of 0.050".

Minimum centre to centre spacing of .012" tracks: .025". Use .050" where possible.

For DIL ICs use 0.070" pads and 0.8mm holes. If there are tracks between pads you can use rounded rectangle pads .060" x .120". This will allow a .012" track to pass between pads and allow enough copper for hand soldering.

Assembled boards:

As well as the bare boards, we can supply and assemble the parts if required. For an assembly quote, email us a parts list, preferably in Excel spreadsheet form, with fields:

Component, Type, Value, Quantity, Digi-Key Part No, Manufacturers No.

Electronics Software Design:

We can also design software for embedded systems, STM32, Arduino, RaspberryPi, PIC, Picaxe.


The PIC Club

The PIC Club, a part of the the Sydney PC User Group, meets in Sydney 6pm-8pm on the second Tuesday of each month. We discuss microprocessor project design and programming. Come and show your projects, or see some others. The next meeting is on Tuesday February 14, 1st Floor, Sydney Mechanics School of Arts, 280 Pitt Street, Sydney.

The following are highlights of the latest meeting. See previous meetings.

At the January meeting we were told of Einstein's description of telegraphy and radio. Telegraphy is like a very long cat. You squeeze its tail in New York and it meiows in Los Angeles. Radio is just the same, except there is no cat.
Alex showed a mini stereo amplifier he built using a stamp-sized board with a 3 watt chip called the PAM8403. These are available on ebay for $1 and run off 5 volts. There is a slightly larger module which uses the 10 watt PAM8610 chip. He hooked it up between his computer and some speakers and achieved high-quality sound reproduction.
Andrew discussed 8 bit PIC16 chips that contain new peripherals, such as a 10 bit analog-to-digital converter which can do averaging and filtering functions while the CPU is in the Sleep state. The most capable of these chips is the PIC16LF18877, which has a flat program memory space of up to 56 KB and up to 4K of SRAM, extending the scope of the PIC16 family into new areas. To assist with designing systems using the various peripherals Microchip now offer MPLAB-MINDI, a circuit simulator for both analogue and switched circuits. At a future meeting this will be demonstrated in action.


Website by Neville Hoffman

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