The British Amateur Electronics Club Archive
Membership Section Updated [JUNE12] + (Sent in Articles, Interface sections; JULY00, DEC00 and MAY02 Newsletters)
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Please note this is just an Archive Site of old British Amateur Electronics Club Material. The Club consisted of over 140 Quarterly Printed Newsletters in total. I will be adding some interesting articles from old Newsletters, and other sources plus links etc... So keep an eye on the site. I will flag it clearly with a NEW gif at the top of the page if there is any new material. The Club also traded electronic components among Members, and gave Technical Advice. I for example sent an Infra-Red Remote Control I had made away to another member for Calibration. I have also contributed some articles to the Newsletter myself.
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BAECA Site Map |
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[Uploaded Oct10]
Amstrad PC1512 interface card system. 8-bit I/0, Analogue to Digital, Stepper Motor, LCD display, and Starburst display.
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| Engineering Notation |
Electronic Engineering
Character Set
- using the 'Alt' key or HTML. Includes symbols for ½, ¼, ß, µ, ±, ™, ©, ², ³, ®, 3/4, x, and angles. NOTE: Microsoft Word 2002 also supports exotic characters, engineering included. To get them all you have to is select the 'Insert' then 'Symbol' menu.
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Engineering Measurements
from yocto, to zepto, atto, to femto, to pico, to angtrom, to nano, to micro, to milli, to centi, to deci, to deca, hecto, to kilo, to mega, to giga, to tera, to peta, to exa, to zetta, to yotta............ to tebi...................................... to google......................................................................... to googleplex.
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BAEC Newsletter Archive:
AUG74, DEC90, MAR92, JUL92, DEC93, MAR98, JUN98, SEP98, DEC98, MAR99, JUN99, SEP99, JAN00, APR00, JUL00, OCT00, AUG01 and MAY02.
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- No. 35 October 1974 Newsletter.
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No. 98 December 1990 Newsletter - Complete Edition: 11 articles in total.
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No. 103 March 1992 Newsletter
- Book Review:
Servicing TV and Video equipment by Mark Robinson
- Electronics Teach-In Part 5:
Power Supplies by M.A. Stracey.
240V ±10% (with EU 230V range) 50Hz A.C. (Alternating Current) -> 6V D.C. (Direct Current). Has diagrams of:
- Transformer which steps a Voltage down, at a ratio of 40:1 in this case, depending on how many wire turns each side has, from 'primary' side to 'secondary' side. Current goes down from 1A -> 1/40A or 25mA in an 'ideal' 100% efficient circuit. In actual fact 20% of current is wasted as heat in the conversion process.
- Bridge Rectifier Circuit which converts A.C. -> D.C. using a network of 4 diodes giving a 'ripple current'. Obiwan posts to EPE ChatZone on Thursday, 15 June:
"Diodes have ratings, I select a diode for it's application if it isn't already in my box of 'goodies'. A 1N4001 that I might use in a simple power supply, say 100 mA, I will not use in one that delivers 10 Amps."
- This has to be 'smoothed' using a Electrolytic Smoothing Capacitor which is connected from Vcc output to Gnd. Obiwan continues: "The value will depend on the current rating you are dealing with. A 5V power supply that supplies 10 mA will have a MUCH smaller capacitor than a supply that supplies 5V @100A."
- A Regulator 3-pin IC is used to give a steady output voltage.
Typically: LM7805 -> 5V; LM7812 -> 12V ; LM317 ...
- A Neon light or LED can be used to show the output is live.
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Adjustable Power Supply by John Wilkinson.
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Doorbell for the Deaf by S. R. Wooding. Built using x4 2-input NOR Gates, a 10-line decade counter, and an opto-Triac which isolates the low voltage logic from the mains, while allowing it to trigger a 25W mains driven lamp. Plus some discrete components. With circuit diagram.
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Additional
Chip Power Supplies:
5V TTL and 12V CMOS (can be in range 3V-15V).
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Additional
From single
Transistors to VSLI (> 1,000,000 Transistors on one chip) and beyond ; plus Intel processors.
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No. 104 BAEC July 1992 Newsletter
- Electronics Teach-in Part 6:
Regulators 1 by M. A. Stracey Eng. Tech. (AMIEIE) G7LKJ. With Fig. 1 - 7 diagrams detailing Zenor Diode Regulator Circuits and Diode Characteristics. With 1, 2, or 3 transistor gain using the 'Darlington connection' method.
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In-Circuit Transistor Tester by Alan Willcox. Using the obicuous 555 timer, a 4 Diode Bridge... Plus Components List, PCB track layout (for etching your own PCB), component layout, and Test conditions and results table.
- No. 110 December 1993 Newsletter
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No. 114 BAEC December 1994 Newsletter
- Designers Notes 11:
7217 Presettable U/D Counter IC driving x4 7-Segment Displays with x4 BCB Thumbwheels input. By Alf Dension.
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Beginner's Notebook 3 - switching the Mains using low voltage circuits.
By Alf Denison.
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Microcomputer Interfacing 2 by Dave Rowntree. Uses an example Zilog Z80 Processor to:
- Input from a 16 Key keypad.
- Drive a Binary-to-7-Segment-Display Decoder Chip like the
CMOS 4511.
- Drive the much more advanced 8255 PIA (Perihpheral Interface Adapter) which has three 8-bit Ports.
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No. 127 March 1998 Newsletter - Complete Edition: 10 articles in total.
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No. 128 June 1998 Newsletter - Complete Edition: 10 articles in total.
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An introduction to SCART by David Vere - also known as a Peritel Connector or Euro Connector. It was always there but hardly ever used. Pre-Digital Boxes!
- No. 129 September 1998 Newsletter
- [Updated Jun06]
Introduction to the Internet Part 1 - Getting Connected - using Dial-up!
- [Jul98-2000] -> [Jul98-Jun06] Changes registered using tracker (much more detail in Article).
- Netscape 48.8% -> 17.51%
- MSIE 46.41% -> 81.03%
- Other 4.77% -> 1.45%
- No. 130 December 1998 Newsletter
- No. 131 March 1999 Newsletter
- No. 132 June 1999 Newsletter
- [Uploaded Sep08]
No. 133 September 1999 Newsletter
- [Uploaded Sep08]
No. 134 December 1999 Newsletter
- No. 134 January 2000 Newsletter
- [Uploaded Sep08]
No. 135 April 2000 Newsletter
- [Uploaded Dec10]
No. 136 July 2000 Newsletter
- [Uploaded Sep08]
No. 137 October 2000 Newsletter
- [Uploaded Dec10]
No. 138 December 2000 Newsletter
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No. 140 August 2001 Newsletter
- Video Fader Box
by Mohammed Bashir
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How to get started in PIC Programming by
Eric Edwards GW8LJJ
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About the PIC 16F84. First details a digital circuit to count in binary on LEDs using a 555 Timer and
CMOS 4024 7-bit (÷128) Ripple Counter Chip plus 2 resistors, 3 capacitors and 7 LEDs. Constructed on plugboard, no soldering. Then shows how a PIC can do the exact same thing using only one IC (Integrated Circuit) with only 2 resistors, a capacitor and again off course 7 LEDs. The PIC is programmed using a PIC BASIC compiler (PBC) to produce HEX (Hexadecimal, base 16: 0-9 + A-F) code. So no need to know about op-codes, assembler, the accumulator, status register (flags: zero, carry, division-by-zero error...), stack, ALU (Arithmetic and Logic Unit, does logic and addition) fetch-execute cycle... Then goes on to show how the PIC can be re-programmed to do a different task. Impossible for the digital circuit! Less components and more functions.
- [Uploaded Dec10]
No. 142 May 2002 Newsletter
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Digital Electronics
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Sent in Articles and Circuits
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Science, Maths and Engineering Articles
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| Chat |
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Membership
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Membership is FREE. Members E-mail Addresses, Experience, Interests, Qualificatons... are listed. Feel free to send in you details, particularly projects of interest, and links to any electronics related sites you have. The Club no longer publishes and posts a Newsletter! Although sent in articles etc... will still be published on the 'net.
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PIC Microcontroller Zone
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Trading / Buying
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Useful Electronics Links
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- Everyday Practical Electronics -
UK Electronic Hobbyist's Magazine. Have quality pre-made PCB's for their construction projects. On-Line or by Subscription.
- Elektor - UK Electronic Hobbyist's Magazine. Have many construction projects with pre-made PCB's. On-Line Subscription available. Bi-monthly Publication... and many more just follow link.
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Recommended Electronic Component Suppliers
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- Maplin -
postal retailer with shops of 12,000 quality Electronic Components and Items, large stock, own catalogue. P&P £2.50, free over £35.
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Arizona Microchip - Arizona MicroChip maker of PIC Microcontrollers, RISC low Kbyte microprocessors with built in input/output drivers.
- Greenweld - postal retailer of quality Second Hand Electronics Components... and many more just follow link.
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| Club Library |
***Free*** BAEC
Lending Library
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| Places to Visit |
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[Michael] Faraday Museum: at the Royal Institution, 20 Albermarle Street, Near Piccadilly Circus and Green Park Underground Stations, London.
Admission Charge. Open 10 a.m. to 6 p.m. Mon. to Fri.
Pioneer in the field of Electricity and Electronics. Inventor of: the Capacitor (the unit of Capacitance the Farad in named for him: F, more commonly µF), the motor (using a mercury 'well' as conductor), the dynamo...
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The Science Museum, Exhibition Road, South Kennsington Underground Station (with tunnel walkway that leads directly to the Museum), London.
No Admission Charge. Open 10 a.m. to 6 p.m. Open every day except 25th, 26th, and 27th December.
New Exhibits. Exhibits include the Computing Section and Charles Babbages Mechanical Difference Engine ; and Electronic Tele-Communications. Plus much, much more. 6 floors!
Webmaster pictured with Babbage's Difference Engine No. 2. A primitive Victorian Mechanical Computer made to calculate logarithms for navigation. It never worked as Victorian Engineering wasn't precise and cheap enough, and Babbage's temperament wasn't good either, but the design was sound and has been proved to be correct.
Pictures and Description of Babbages Difference Engine.
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Programmes to Download FREE
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Colour code convertor -
The colour code convertor is a special purpose computer program which will help you identify the value of a resistor from its colour code. Alternatively, the program lets you find out what colours to look for by typing in or selecting the resistor value.
The programme works with Windows 95 and is FREE to download.
Resistor Prefered Values
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Ohm's equation calculator -
This is a computer program which allows you to apply Ohm's equations quickly and easily.
The programme works with Windows95.
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 Robot.org.uk Micromouse page. The IEE Micromouse contest started in 1977.
- Micromouse - Free BASIC and Pascal Maze Solving Programmes to Download.
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