Welcome to my guestbook, where you can see what previous visitors think about this site and my projects and articles. Many thanks to everyone who has left messages - your feedback really is appreciated!

Guestbook entries from 2007 (33)

    • Mark Homer
    • London, England
    • 26 December, 2007

    Hi Mark

    Just wanted to say thanks for your A1 section of this site - I changed all the electrolytic capacitors on my 1986 A1 and it's back on song! (Back in Black?!)I have sentimental attachment to this amp. - it was my work experiance gift whilst at Mordaunt-Short. Symptom was - very low volume on the right channel, clean but about 80% down. Caps. from RS Components, including 35V power supply caps (ref 127-802, not radial but axial so I had to extend the conections with tinned wire), a decent amount of heat sink compound and a good scrub down of the top Heat sinks and it feels like new!

    Best regards


    • Manfred
    • Germany
    • 7 November, 2007

    dear mark,

    i must say that you have a nice web site. most of all i like your artikle about the A4-Amp. it look very nice and i hope that my amp looks as good as yours when i'm done with it.

    keep up the good work!

    best regards

    manfred (Germany)

    • Peppe
    • IT
    • 28 October, 2007

    Lots of compliments for your site and for shared your projects. You're great. I hope you continue to update the site.

    Thanks a lot.

    • Thomas Tang
    • Singapore
    • 28 October, 2007

    Greetings from Singapore !

    I instantly fell in love with your site as we have many interest in common. Programming PICs / making amps / collecting old british loudspeakers. Your info on Rogers speakers are 2nd to none... infact the trick on putting the bass driver 180 deg put a smile on my face. I recently picked up a pair of Tannoy Mercury M20 ( translucent cone & gold tweeters )... there was some rubbing on loud low freq passages on one driver.. I inverted both the drivers and now they sound excellent !

    Keep up with the good work of sharing!

    Best Wishes

    • Mark Ratcliffe
    • Australia
    • 23 October, 2007

    Out of sight - thanks

    • Simon
    • 11 England, 2007

    Great advice. Owned same LS4a speakers for 17 years - thought they had finally given up with increasing distortion from one unit, but turned upside down as suggested and problem instantly solved!

    • Nigel
    • London, England
    • 29 September, 2007

    Mark, thanks for putting together such a detailed site for starting in programming PIC's. I have spent a year killing 12F975's and decided to actually start to learn how to program these things.

    Right now i have a 16F84A is sat in my K8048 PIC Programmer board. There are 4 LEDS happily counting up to 16 in binary - excellent.

    It easy to program some HEX on to a chip, but understanding the assembler code is something else. Your tutorial has helped me enormously in actually understanding the code.
    5 Stars, Thumbs Up, A++

    Thanks again

    • Tim Hodson
    • Amersham, UK
    • 28 September, 2007

    Really enjoyed your site! I work in IT, but my main interest is music and music technology, so I appreciate your particular perspective!

    All the best,

    • Stephen
    • New Zealand
    • 13 September, 2007

    Hi Mike
    This is a good site. I use to know all this stuff but then got sick and it's like my brain was was erased. So your site is providing me with lots of ideas and examples I can build to get my brain started again. Also it's a lot of fun


    • Jerry
    • Massachusetts
    • 29 August, 2007

    A very informative website. Seems to cover the basic information needed to work with PICs.

    • Christine Mickelson
    • USA, Sioux Falls South Dakota
    • 16 July, 2007

    Dear Mark,

    Thank you for creating this site. My significant other and I have been searching high and low for a begining to PIC programming and your site is just what we need.

    Highest Regards.


    • anthony
    • Glasgow
    • 3 July, 2007

    Greetings from Scotland!

    I really like your web site; most informative and ref. your home life, most reassuring. You are a great encouragement.

    Best wishes to you and yours.


    • zool
    • browsing through google
    • 18 June, 2007

    I am trying to learn the PIC the easy way, but none available in the internet, not until I found your website. It is clear and very concise.

    It's written with down to earth language, and very easy to understand. I am embarking on a cnc router project, and I need to know the way to program a PIC.

    You deserve a credit on this, and thank you very much for a splendid tutorials.

    I bookmarked your website, and looking forward for any updates.

    Thank You.

    • xbot sanchez
    • PH
    • 13 June, 2007

    thanks for the info mark. am also planning to build similar shop as yours so i can go ahead workin on some stuff.

    am also into arts, music and electronix... they all seem to fit together don ya tink?

    • jay douglas
    • Arizona, USA
    • 28 May, 2007

    thanks for your efforts. its a great site. the legend that is rogers, lives on.

    • Jimmy Tuffrey
    • Bristol
    • 19 May, 2007

    Oh 'Studio 1's' so that's the name of the speakers I learnt sound on. We had these when I worked at Wild Tracks in the late '80s. Always wondered what they were called. Should have taken more notice at the time. Will never forget the sound of them though. We had four pairs and even now I hear that sound in my head when using my inner ear. An old fashioned sound but very pleasing. Remember them like yesterday. Nice one for your Site.

    • Richard Harris
    • UK
    • 11 May, 2007

    Nice conversion - Sadly my good lady seems to think we should keep the cars in our double 24 foot wide garage :-(

    If you not aware of them have a look at as an alternative to Parallax. UK company and cheaper.

    I came by your site as a result of your battery monitor being Blogged on We are building an electric car (Greenpower racing) at school and have got to the instrumentation stage, better condition was one of the must have features

    • Pat
    • London
    • 8 May, 2007

    Just found your site when looking for links to Orchid White paint. I'm into hi-fi too, and have some MF stuff, a Pink Triangle turntable and a 1970s bathroom suite also in pink!

    Will come back for a proper look tomorrow...

    • Jeremy Travis Teletape
    • London
    • 5 May, 2007

    Thank you for your great site. I worked in the Hi-Fi trade for twenty five years. My company produced the legendary JR149 loudspeakers.

    I retrained in production engineering but ended up working in a school. Having now lost my job I have returned to my roots and want to build my own system again. I used to know John Linsley Hood and of course Jim Rogers.

    I will enjoy looking at your site. I hope I will find some good designs I can make myself and get back to real music.

    MP3 sucks - Hi Fi forever

    Thank you

    • Ray Evans
    • Bolsover
    • 24 April, 2007

    Thank you for your site..just starting with assembler and pics. Thank goodness for a clear and easy to understand tutorial.

    • FADY
    • Israel
    • 19 April, 2007

    thank you a lot for these important information about pic

    • Howard Bailey
    • Bournemouth in Dorset County UK
    • 16 April, 2007

    Dear Mark,
    I 'stumbled' across your site whilst browsing, it's definately bookmarked now.
    I like your method of teaching, it's very good, especially for complete newbies like me !! Please, please, please more of the same. There is a saying in a UK TV advert i.e. "Those who can, TEACH". I teach First Aid & advanced First Aid, so I understand a lot of the prerequisites that make for good teaching and the satisfaction that you get from it.
    Working on my own I am finding it hard and slow going, where would you suggest would be the best places to study/meet others/courses, to accelerate my learning process ?

    • Christian Furész
    • EU, Hungary
    • 26 March, 2007

    Great site!
    I'm not so good at English, but I can understand what you wrote. My favourite project from yours is the 'A4 power amp'. Where can I buy a button like that?
    Congratulations from your A4.

    • ganesh kumar
    • India
    • 18 March, 2007

    hi Mark,
    Thanks for your kind effort to prepare and share such a wonderful work. Yours is one of the best tutorial I have ever come across. Keep going and Growing.

    Thanks & Regards,
    Ganesh Kumar.

    • uzun
    • Türkiye
    • 2 March, 2007

    Great info for me.Has helped me understand PIC programming. Thanks for share.

    • Antonio
    • Mexico
    • 22 February, 2007

    Saludos from Mexico!

    Very clear instructions on Pic programing.
    I'm taking a colege course on microcontrollers, but my teacher was always a big A*s >_<
    Your site helped me understand the basics, now I'm on my own and I'm doing fine! Thanks alot!

    • Oliver Roditi
    • Glasgow, Scotland
    • 22 February, 2007

    Would like to congratulate you on the amazing site. I'm currently sitting with an A100 in front of me and am utterly astounded, such an informative site with a great design. Haven't found much like this for a long time.

    • Caros Chean
    • Brazil
    • 18 February, 2007

    Wow, I was impressed with your work! As a Musical Fidelity enthusiast, I own 2 A-1, a "British Fidelity" labeled american model and a mkIII version. I also own a P140 power amp and a Digilog DAC. I hope to get a Collector's Edition someday. Please keep with the good job!

    • Frank
    • Germany, Baden-Württemberg
    • 27 January, 2007

    I am really impressed about your exact work and dokumentation. Go ahead with it.

    • B. Fisher
    • Welland, Ontario, Canada
    • 18 January, 2007

    Google searched on "Rogers Studio 2 speakers" and came across this great site-kudos to Mark! Am asking anybody out there if they have any info/critiques on these Rogers. Thanx again Mark.

    • Kyle
    • Chicago, Illinois - USA
    • 16 January, 2007

    Just wanted to say thank you! Your PIC tutorial was very straight forward and easy to learn from.

    • Andrew
    • Tokyo, Japan
    • 14 January, 2007

    Great site Mark - I hope you are working in a development environment somewhere turning out great products! Nice clean design (I'm talking about your pre-amp here) and beautifully executed.

    Best wishes

    • Jared
    • Brisbane
    • 3 January, 2007

    Hi Mark,

    Great website - Great Info.

    Has helped me understand asm programming - Finally!

    Congratulations on the baby.