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Search Again :: Adv Search 1000 results in 0.104s
<1234567…34>
  • Component Equivalents/substitutionsA while ago, I mentioned to somebody in a thread that we should have a list of component equivalents and substitutions so that it's easier to fix our…

    ... a list of component equivalents and substitutions so that it' ... or substituting the component myself and doing a 24 hour bench ... hold of in the USA and Europe, but not essential. ... position can be replaced with BC547, BC548 and BC549 in Issue 2+ Usually improve ...
    DEATH DEATH December 2006 Hardware
  • TR1 & TR2 replacement - now dark picture?Hi all I saw a list of diodes you could swap out for better modern equivalents. I saw TR1/2 could be replaced with BC547 which i had afew of (BC547 …

    ... /2 could be replaced with BC547 which i had afew of ... ]ZTX313 can be replaced with BC547, BC548 and BC549 in TR1/TR2 position (Usually ... is terrible at the moment and thought it would be a ... now got a black and white picture and its quite dark...
    dreamscape dreamscape September 2014 Hardware
  • +2 Grey video issueSo far ive replaced TR4, TR5 (and correctly orientated them) and seperated the audio from the video, still I have this; [youtube]mZZWOXRs_Zk[/youtube…

    ... />
    The pin-out for BC547, BC548 and BC549 is the same for all ...
    1024MAK 1024MAK February 2014 Hardware
  • ZTX313 vs 2N2369 pinoutJust for info: [IMG]http://benophetinternet.nl/hobby/vanmezelf/2N2369 vs ZTX313 pinout.jpg[/IMG]

    ... transistors and groups them in to a gain group. For the BC547 / BC548 / BC549 ... .

    In most applications (and indeed all well designed circuits ... group transistor.

    The BC547 / BC548 / BC549 series are equivalents for each ...
    1024MAK 1024MAK June 2013 Hardware
  • +2 Grey video issueSo far ive replaced TR4, TR5 (and correctly orientated them) and seperated the audio from the video, still I have this; [youtube]mZZWOXRs_Zk[/youtube…

    For a[B] Z70500 ISS3[/B] board, fit replacement BC547/BC548/BC549 transistors exactly as per the silkscreen for TR4, TR5 and TR7 positions.

    [I][B]Mark[/B][/I]
    1024MAK 1024MAK February 2014 Hardware
  • ZX81 Composite Video Mod?Hello. Does anyone know how to modify a ZX81 to output composite video as opposed to a modulated RF signal? I believe it can be done with one trans…

    ... done with one transistor (which?), and a resistor (value?).


    Any NPN transistor (BC547,BC548,2N2222,...)
    For the resistor ... UHF modulator pins (+5V,GND and Video IN)
    Gods Gods August 2007 Hardware
  • ZX81 Composite Video Mod?Hello. Does anyone know how to modify a ZX81 to output composite video as opposed to a modulated RF signal? I believe it can be done with one trans…

    ... ]

    Any NPN transistor (BC547,BC548,2N2222,...)
    For the resistor ... UHF modulator pins (+5V,GND and Video IN)[/QUOTE]


    An excellent circuit diagram and picture, as trivial to implement ...
    chaoticjelly chaoticjelly August 2007 Hardware
  • Barn find #4I think this is some sort of backup device. Its got "007" on the motherboard and the mice have chewed the buttons. Will do a little research later in…

    ... get. I would use a BC547, BC548, BC549 or BC184 as I have ...
    1024MAK 1024MAK August 2013 Hardware
  • New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…

    Yes, I think that's right. BC547 = BC107, BC548 = BC108, BC549 = BC109. All three transistors in this mod are being used as emitter followers so more or less any small signal NPN transistor will do.
    rga24 rga24 July 2014 Hardware
  • Spectrum Issue 2 - TR6 ReplacementI've just got my hands on an Issue 2 ZX Spectrum, that needed some repairs. The picture quality after doing a composite modification was pretty shodd…

    ... signal NPN transistor. So a BC547, BC548, BC549 etc. are all suitable.
    1024MAK 1024MAK August 2014 Hardware
  • ZX81 Composite Mod<p>I've done a simple composite mod to my Issue 3&nbsp;ZX81 following a basic schematic I found on one of the ZX81 forums. Mod consists of a BC547, 1…

    ... Mod consists of a BC547, 100R and a few wires for input ... disconnected the modulator power and signal input and attached the output from ... The picture is bright and stable and as good if not better ... tried fiddling with the contrast and brightness but with no ...
    retrogamemart retrogamemart June 2015 Hardware
  • Crappy video in +2B/+3Maybe it's not a failure in my ZX Spectrum, but I need some advice... I've got some spectrums (a ZX Spectrum +, two spanish ZX Spectrum +2B and a mo…

    ... between emitter and ground (and output connected directly to emitter), and interestingly it ... /> Seriously amstrad did misplaced transistors and did it work? Still wondering ... to be built around bc558 and bc549, no 2n3904. Maybe it's ...
    Zup Zup March 2010 Hardware
  • The right toolsAs i am going to pick up a hobby of fixing spectrums I wanted to know whats the right tools for the job. Like what wattage should the soldering iron …

    ... free, it melts too hot and is generally crap :P
    Print it out and treat it like your bible ... /> A selection of screwdrivers, snips and various other handtools.

    BC547's) and some ZTX650's. 4116 and 4164 RAM chips ...
    DEATH DEATH July 2013 Hardware
  • +2 Grey video issueSo far ive replaced TR4, TR5 (and correctly orientated them) and seperated the audio from the video, still I have this; [youtube]mZZWOXRs_Zk[/youtube…

    ... Since the collector and emitter of BC547's and the opposite way ... [*]For a 70500 board, install BC547's in the correct orientation ... br /> [*]70700 - install the BC547's in the opposite direction ... outlining replacements per model and outlining if the suggested ...
    balford balford February 2014 Hardware
  • Repair ZX Spectrum +2 black issue 1Hi all, after a long time i will try to repair a ZX Spectrum +2 black i found the last days i know for sure that CPU is damaged (already repla…

    On the +2A and +2B machines TR1, TR2 and TR3 form a video ... types, part number BC549
    Both BC558 and BC549 should be available from ...
    1024MAK 1024MAK June 2017 Hardware
  • Issue 4A issuesHi all, I've been trying to get the Issue 4A board that came DOA with the case I purchased for my Frankenspectrum to work. I've recapped and socket…

    TR1 and TR2 - BC547. Do you get this screen ... has a higher gain - and the BC549 has a low noise figure ... pattern on an unmodified Spectrum, and it's perfectly normal - in ...
    DEATH DEATH July 2013 Hardware
  • +2 Grey video issueSo far ive replaced TR4, TR5 (and correctly orientated them) and seperated the audio from the video, still I have this; [youtube]mZZWOXRs_Zk[/youtube…

    ... BC548 is a replacement for TR1 and 2 and BC547 for TR4 and 5 ... but can also be used for TR1 and ... nice definitive 48k list and a 128k specific one would ... transistor to use in TR4 and 5 in a 128k ... +2 Grey and what orientation, if I ...
    Macc Macc February 2014 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    ... =ingo;772038]I think the BC547 is not a good choice ... also experimented with different circuits and as you wrote at the ... (or some BC548 or BC549C, I forget which) and because it is ...
    1024MAK 1024MAK June 2014 Hardware
  • +3 disks and pc'sHi, This is my first post, and was wondering if someone could help me. I have some +3 disks from my original +3 that I want to put on my pc to use i…

    ... /> This is my first post, and was wondering if someone could ... haven't really found any, and the few I have found ... don't appear on there and I would be happy to ...
    Anonymous Anonymous February 2002 Emulators
  • Pls, I need a emulator which works with tzx. and slt. filesCould someone tell me about an emulator (simply to use, preferred) which could emulate tzx. and slt. roms, pls? Now, I got the ZX32 emulator, but it …

    Could someone tell me about an emulator (simply to use, preferred) which could emulate tzx. and slt. roms, pls? Now, I got the ZX32 emulator, but it doesn't work with those files.

    Tanks, people.
    Maciste Maciste June 2001 Emulators
  • Re PSI Chess and others...After reading about Ed's 36 hour decoding mission on PSI Chess, I feel that the one thing we need is a totally comprehensive instructions section. I …

    ... nothing but htmled original instructions and nothing more, like they do ...
    Spector Spector February 2002 Games
  • Zenobi Adventures, and others for that matter.Hi Folks, You might have already seem my latest MIS Update which contains a lot of Zenobi titles. Actually it doesn't cos we're not allowed to yet …

    ... 1989 Zenobi Software
    Brian And The Dishonest Politician ( Parts 1 ... 1989 Zenobi Software
    Desmond And Gertrude 1991 Zenobi Software
    Andrew Barker Andrew Barker October 2001 MIA/STP/SDP
  • Wanted: TZX for Dr Jeckly and Mr HydeHi Folks, Does anyone have or can provide a TZX for Dr Jeckly and Mr Hyde by Essential Myth. I believe there are 3 parts for this Gothic Text Adven…

    ... a TZX for Dr Jeckly and Mr Hyde
    by Essential ...
    of the WOS associates and they'll do it for ...
    Andrew Barker Andrew Barker September 2001 MIA/STP/SDP
  • LINE-routine and other nice pieces of codeThe line-topic came in the end with a nice piece of fast coding. I think that there might be more of these routines out there (where-ever-u-r). Isn…

    ... />
    I made an emulator and to decide which code had ...
    Dr BEEP Dr BEEP October 2001 Sinclair Miscellaneous
  • Which emulator and assembler?Hi, I am looking to learn z80 assembly language and I feel the best option is a spectrum emulator and an assembler. Can anybody recommend the best …

    ... to learn z80 assembly language and I feel the best option ... is a spectrum emulator and an assembler. Can anybody recommend ... emulator for this (Win 98) and the best assembler/ease of ...
    mark mark August 2001 Sinclair Miscellaneous
  • can i convert .SNA and other files to tape??is it possible to covert the files TAP, LTP, VOC, ZXS (read-only), TZX (up to v1.13), and .SNA files to tape. If so, where can i get the program

    is it possible to covert the files TAP, LTP, VOC, ZXS (read-only), TZX (up to v1.13), and .SNA files to tape. If so, where can i get the program
    deltamdx deltamdx June 2001 Sinclair Miscellaneous
  • Spectrum collecting and nostalgia.I have recently started to buy and collect old Spectrum games and thought that it would be easy, but easy it is not. Well I say not because on auctio…

    ... to buy and collect old Spectrum games and thought that ... very popular with buyers, and to be out bid is ... to where it all started and have some fun?
    ... has a PC, and a Playstation and he still uses his ... />
    Has the fun and enjoyment gone out of modern ...
    Anonymous Anonymous April 2001 Sinclair Miscellaneous
  • IF1 and IO portsThe Interface used 3 Z80 IO ports to communicate to it s devices #E7- Microdrive data #EF- Status and control #F7- RS232/Network What I'm looking…

    ... - Microdrive data
    #EF- Status and control
    #F7- RS232/Network ... far I'm upto 0FAC and the network routines seem quite ...
    john john March 2001 Sinclair Miscellaneous
  • 48k with keyboard of 128k+2 and tapes..ahoi!i worked to make a 48k+ with keiboard of 128k+2 and i want to send it! so i have many tapes with games, workings'n' demo, compilation, fanzine!!!! fo…

    i worked to make a 48k+ with keiboard of 128k+2 and i want to send it! so i have many tapes with games, workings'n' demo, compilation, fanzine!!!! for info contact 0347 8783346 or 3478783346.
    simon simon December 2001 Sales
  • Sinclair Mags, Tapes, and joysticksHi folks I have the following for sale :- Sinclair user issues 103, 88, 87, 86, 85, 84, 73, 72 Sinclair User Megatape 25 2 Cheetah 125 joysticks …

    ... here, buyer also pays postage and package.

    Regards
    Andrew Andrew July 2001 Sales
<1234567…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

HitBox

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bc547 75 89
bc548 26 28
and 504K 1.3M
bc549 27 30

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