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Recent content by bob_rich

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    Kamoden HM-350 transistor Tester

    Hi Jeff I did not get a handbook so if you had a copy that would be really helpful. With a hand book I should be able to see how to set it up. To be honest I have not used this forum much and I don't know how to e-mail you so perhaps you could explain how to do that. Bob
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    Kamoden HM-350 transistor Tester

    Hi All anyone got a hand book or user guide for the above transistor tester made by Kamshita. thanks in advance for any help cheers Bob
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    Audio Book Reader Visuaide 101VRC

    Hi All I am trying 2 fix a Audio book reader made for partailly sighted people , owned by a blind friend of mine and originally supplied buy the RNIB It is an old unit ( May 2002) and not supported by any of the RNIB suppliers now. It is a CD based unit of Canadian manufacture and has just...
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    Kamoden HM 350 manual wanted

    Hi folks Has anyone got a manual for a Kamoden HM350 Transistor tester. It is an early 60's or 70's unit that can check NPN or PNP transistors for various parameters including current gain. thanks in advance for any help Bob
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    Increasing output of flyback transformer?

    Hi the output from a 555 timer would not provide a enough drive current for charging/discharging the fets input and miller charge. this may make them switch slowly and thus get hot. I would put a driver chip specifically designed to drive mosfets (such as for example MAX4424 max4420). For...
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    60 Hz transformer for high frequencies

    Hi As the frequency goes up the flux density in the core will drop offsetting to some degree in increase in core loss due to eddy currents in the core at the higher frequency . However the series impedance due to the leakage reactance ( the imperfect coupling between primary and secondary)...
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    inductor designing

    The equation is a form of Wheelers Equation and is generally accurate to around 3% provided length (l) is no shorter than a/2. The units are uH ( micro henries) for inductance and inches for dimensions. At hIgh frequencies , and assuming copper or silver plated copper wire is used the...
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    Need help with part number search

    are U sure the transformer is shot? It certainly does not look burnt out. sometimes they have a thermal fuse link and this fails and can usually be replaced externally. Other possibility is to look at the voltage rating of capacitors in the power supply and try and gauge what the DC supply...
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    TV service manuals

    Hi all try the link below They have allways had what I was after reasonable prices to best of luck Bob http://www.manuals-in-pdf.com/
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    Trying to find a datasheet UC81541

    hi Unitrode parts are now handled/made by Texas Instruments. Other also do copies. usually the UC part is dropped from the number. hope this helps best of luck bob
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