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Forum Replies Created

RE: 1977 Ferguson 3734 ColourStar: Thorn 9600 Chassis

Chris I noticed on page 4 of this thread that your chopper transistor has the date code 7921 i.e. this very week in May 1979, so either the set was made a couple of years after the introduction date o...

In forum Colour Television

4 years ago
RE: New project: Capacitor reformer

It was common practice with analogue multimeters to connect a pair of 1N4148 or similar diodes in parallel with the meter movement with 1 diode cathode to negative meter terminal, 1 diode cathode to p...

In forum Test Equipment

4 years ago
RE: Does anyone want to build anything these days?

Mark Hennessy has written up details on various DVM voltage reference projects here John

In forum In The Workshop

4 years ago
Answer to: Site Performance Problem

Chris I've noticed that switching between pages on VRAT 2.0 has always been slow; usually taking around 10 seconds even when using the browser back / forward arrows. I don't see this behaviour on any ...

In forum Website-Blog Support Tickets

4 years ago
RE: Aug 1967 Ferguson 3700: Another BRC/Thorn 2000 Chassis for the collection

Posted by: Chris I'm finding it hard to see why BF199's would cause a problem. Attachment : txs.jpg It has me wondering if we're on a red herring hunt and there's nothing wrong with the BF199'...

In forum Colour Television

4 years ago
RE: Sputnik TV.

Portable colour sets were rare until the late '70s, early '80s. I'm not aware of any European colour portables that were current in 1972. The only small screen colour sets that spring to mind that wer...

In forum Black & White Television

5 years ago
RE: Unusual test thingy... Minolta TV-color analyser II TV-2140

FordAnglia said An early 'microprocessor' based instrument. Quite a leap forward in hardware design. Not that early really, there are ICs with date codes from 1989 and 1993. The Z80 would definitel...

In forum Test Equipment

5 years ago
RE: A Marconi 702 Mirror-lid TV restoration: Part 2

Cathovisor said The reason for the detachable earth pin in your Schuko is because not all Schukos are equal. IIRC, in France they have a prominent earth pin in the wall outlet, so the pin in the outl...

In forum Brian Cuff: The "Pre-War" TV Master; Memorial Archive

5 years ago
Re: A talented dvd player...

The DVD will contain a serial number that the player can use to distinguish a given title. The player most likely contains some Flash memory, this is non-volatile; the serial number and location reach...

In forum General Technical Discussion

6 years ago
Re: PIC 405 line pattern generator

I wouldn't recommend using the internal RC oscillator of any PIC. The frequency tolerance is around +/- 8% at room temperature. As an example, this is bad enough for communication via the PIC's UART t...

In forum Test Equipment

6 years ago
Re: Leak Stereo 30 Plus goes pop!

Shorted rectifier diodes are very common with these Leak Stereo and Delta transistor amps. My own Delta 30 that I was given in non-working condition in 1983 had exactly this problem. If this is the ca...

In forum Audio & Hi-Fi

6 years ago
Re: ITT Radio Cassette alarm CCR 300

Mike The Kingbright and Morphy Richards displays are indeed multiplexed as Lloyd stated. The idea is that each digit is lit in turn by presenting the 7 segment bits and then applying power to the comm...

In forum Radio

6 years ago
Re: Resistor Colour Code Mnemonic

Betty Brown runs over your garden but Violet Grey walks. John

In forum General Technical Discussion

6 years ago
Re: PIC 405 line pattern generator

Frank The classic method of applying a gamma transform in a digital video system would be to use the uncorrected digital pixel values as an index into a lookup table containing the gamma corrected val...

In forum Test Equipment

6 years ago
Re: PIC 405 line pattern generator

You should have a go at PIC's there are quite easy, after all I am finding my way around them. A true sawtooth I wouldn't be able to manage but I should be able to do a 32 step grey scale, it would j...

In forum Test Equipment

7 years ago
Re: PIC 405 line pattern generator

Frank I think that the cause of the funny looking circle is that your pixels are not square. Hence, fitting the circle into a 200 by 200 rectangle doesn't give the desired result. I'm not clear on why...

In forum Test Equipment

7 years ago
Re: First telly you owned.

Mine was a RGD badged version of the KB (STC) VC11 Featherlight that I bought for a fiver from a school friend in 1979. It worked OK on 405 lines for a few months, then the horizontal hold became very...

In forum Black & White Television

7 years ago
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