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Search Again :: Adv Search 1000 results in 0.009s
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  • Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…

    ... was designed around the TTL voltage and logic levels. I tried ... (74LS164) and acts a supply voltage dropper. When the interface was ... this, he dropped the supply voltage to the chip with the ... disable the single/double detection circuit, but may be a problem ...
    Pierre Pierre May 2013 Hardware
  • Buzzer sounds tips'n'tricksSo I have an ARM Cortex M3 with a buzzer connected to its GPIO pin. And because I read this forum I know that there is no need to add a separate buzz…

    ... several times faster than the circuit can fully respond, you get ... a crude digital-to-analogue converter. You can control the speaker ... also just a simple beeper circuit. They did far better quality ... into a D-to-A converter (four pins would probably be ...
    joefish joefish May 2013 Development
  • +2 Grey NMI problemMy shonky old +2 has always worked very well until recently, ive found that hitting the nmi button on my multiface will either do one of three things…

    ... 'scope will show you the voltage vs. time - that is show ... very simple Z80 CPU test circuit. Then you can run the ...
    1024MAK 1024MAK May 2013 Hardware
  • another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…

    ... This means that the output voltage depends both on how much ... wrong here. 78xxx series voltage regulator chips need two connections ... or reference so the output voltage will rise to about ... input voltage! So check all connections between the 78S05 and the circuit ...
    1024MAK 1024MAK May 2013 Hardware
  • Is This PSU Useable on the Speccy?I just got my Speccy and the PSU has had some 'work' done to it. Somebody has added an extra length of cable on it but rather than soldering or crim…

    ... likely to become a short circuit, then I wouldn't worry ... ) and that is a lower voltage than from the original in ...
    Zorn Zorn May 2013 Hardware
  • Yet another glitchy graphics 48kHeyo, I'm new both to the forums (sorry if this is the wrong forum) and to Spectra I'm afraid, picked up a 48k from a steam fair sale thingy (not th…

    ... is attached to the 7805 voltage regulator. The 7805 heatsink is ... /s1600/7805-pin-gnd-voltage-regulator-5volts-converter.jpg[/IMG]

    1024MAK 1024MAK May 2013 Hardware
  • Alphacom 32/Timex 2040 PrinterHello again, Having resurrected my ZX Printer, I have now turned to an Alphacom 32 that is not working. However, I am completely in the dark with th…

    ... . I would try testing the circuit with a multimeter, but I ... resistances to the voltage regulators, but am getting open circuit all the ... I don't know what voltage that PSU supplies the board ...
    RobeeeJay RobeeeJay May 2013 Hardware
  • 48K loudspeaker questionsI wonder if someone would know what "40 ohm T.V. type" means? This is the description of the 48K loudspeaker given in the service manual. I?d also li…

    ... , in this case the output circuit of the Spectrum. A higher ... you analyse the Spectrum output circuit on page 43 of the ... the two diodes, then the voltage applied to the Speaker will ... to the speaker. The output circuit of the Spectrum was specifically ...
    Pierre Pierre May 2013 Hardware
  • Testing a +2I recently picked up a non functioning Spectrum +2 Grey (Issue 3 board?), and am just beginning to go through and see what needs to be done to it. I …

    ... is between the assorted circuit tests on original Sinclair ... br /> I note that the circuit board design is very different ...
    1. Check power circuit by checking voltage levels
    a. If ... multimeter much, mainly for checking voltage levels.

    ...
    bverstee bverstee June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... for a transistor because your circuit shows a crude but ... , so there is no voltage amplified. T2 only makes ... the voltage at its high impedance ... relevant when the input voltage is in the 0. ... signal a clearly defined 'zero' voltage, < 0.6V?
    ...
    roko roko June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    The circuit is just an inverter and ... else. It you need a circuit to increase gain (amplify), then ... />
    If you need a circuit to increase the current that ... . They must however match with voltage, current specifications and most important ...
    Pierre Pierre June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... , say 0,6V. So a voltage > 0.6 between the ... the threshold value of your circuit to be close to an ...
    roko roko June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... Spectrum to show how your circuit will interact with them:

    Can a circuit like this cause irregular (unwanted ... current.
    2. The remaining voltage between collector and emittor of ... be far away from the voltage (some 0.6V) that ...
    roko roko June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    @TK90XFan: your circuit is an emitter follower, which always gives a voltage (i ... high impedance). We need this circuit to output either Z or ... /> For all of you: the circuit whose behaviour we want to ...
    mcleod_ideafix mcleod_ideafix June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... : your circuit is an emitter follower, which always gives a voltage (i ... high impedance). We need this circuit to output either Z or ... moment, followed by stable +5V voltage? Please explain me.

    TK90XFan TK90XFan June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... moment, followed by stable +5V voltage? Please explain me.[/quote]
    circuit like yours, the charging time ...
    mcleod_ideafix mcleod_ideafix June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... supply has to raise its voltage supply. When it's beyond ... . Meanwhile, the DC-DC internal converter, begins to generate 12V and ... lower RAM. The DC-DC converter uses the +5V supply, so ...
    mcleod_ideafix mcleod_ideafix June 2013 Hardware
  • Plus D Voltage Regulator OrientationHi, I?ve got a Plus D Disc Interface circuit board without case from a friend. Sadly he sends it to me without care for proper packaging. So it arr…

    ... right: I?ve soldered the voltage regulator as you described:
    (While the printed circuit is simple lying on the ...
    Luzie Luzie June 2013 Hardware
  • UK video recorder in the USA.If I take my UK video recorder to the USA, will it still work if I get a step up transformer and a device capable of displaying PAL. Or will the 60Hz…

    ... find that all the low voltage stuff in a VCR (in ... and there's a control circuit to control the motor speed ...
    Winston Winston July 2013 Chit chat
  • Spectrum +2(grey) rf problem not tuning inHi lads, first of all a quick intro. Im a speccy enthusiast in Ireland, had my first speccy when i was seven in 1987(grey +2). Eventually it got repl…

    ... mentioned is simply a higher voltage device. It simply isn't ... - I don't have the circuit diagram to hand so I ...
    DEATH DEATH July 2013 Sinclair Miscellaneous
  • Converting PAL +2b to NTSC[B]Hello my fellow WoS'ers[/B] I have a strange request for your knowledge and advice. A chap in the US would like to use a Spectrum +2B, however w…

    ... ; they are selected by the voltage on pin 14. Pin 14 ... part of a crystal oscillator circuit inside the TEA2000, and the ...
    rga24 rga24 July 2013 Hardware
  • 16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…

    ... dc-dc step down buck converter modules, and those really seem ... two rectifiers to lower the voltage is sensible enough but with ...
    pmsr pmsr July 2013 Hardware
  • Issue 4A repair attemptI think I need some help. I have a nice Issue 4A main board here, which does not give out any video signal. I checked some voltages (the ones that se…

    ... charge is equal to the voltage source, current flow stops. ... Remove the voltage source and current flows from ... ) 1000 volt capacitors in a circuit that will only put 9 ... only available in pretty high voltage ratings anyway.

    ...
    DEATH DEATH July 2013 Hardware
  • Issue 4A repair attemptI think I need some help. I have a nice Issue 4A main board here, which does not give out any video signal. I checked some voltages (the ones that se…

    ... Second, with electrolytic capacitors, the voltage is the maximum dc working ... capacitor is greater than the circuit voltage, it will do the ... reasons, first, if the voltage on a electrolyic capacitor goes ... capacitor that has a higher voltage rating, so as the ...
    1024MAK 1024MAK July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... capacitor alone that caused the voltage drop.

    That's ... - plus the usual bridge/capacitor circuit - and a fuse :D Maybe ...
    DEATH DEATH July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... talking. If you measure the voltage of the power supply ( ... transformer is loaded, the output voltage of the transformer will fall ... resistance in the coil) and voltage drop due to changes in ... to do a Thevenin equivalent circuit to analyse the specific transformer ...
    Pierre Pierre July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... Okay, been messing with a circuit simulator :razz:

    circuit. This is some ... voltage regulator and heat sink.

    Instead, the pre-regulator circuit ... /> Here is the provisional circuit diagram / schematic:[IMG]http://farm4 ...
    1024MAK 1024MAK July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... simply have a wide supply voltage tolerance - but sod's law ... />
    @Gaz
    Yep - over-voltage PSU. In light of the ... those supplies and drop the voltage some more until the pre ... higher input voltage to function. It is possible that the circuit by ...
    Pierre Pierre July 2013 Hardware
  • Homebrew keyboardGuys, just a quick question. I really should know, but I don't :( I've built keyboards for the standard layout before now, and was hoping to expand…

    ... so, do ya have a circuit layout (etc) you're willing ... and crossing fingers with regards voltage drop!
    JeffB JeffB August 2013 Hardware
  • DivMMC EnJOY!Coming up... [IMG]http://benophetinternet.nl/hobby/vanmezelf/DivMMC_enjoy_first_render.jpg[/IMG]

    ... the base-emitter turn-on voltage for a NPN bipolar transistor ... said, this part of the circuit could have been designed a ...
    1024MAK 1024MAK August 2013 Hardware
<1…14151617181920…34>

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