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  1. vainajala

    Lowpass for subwoofer -project

    http://www.electronics-lab.com/projects/audio/008/index.html I might start building a small active subwoofer, so I have some questions about this circuit. ::) 1: my HT amplifier has a line-level mono sub-out connector. Can I replace the filter's stereo RCA input jacks with single jack, halving...
  2. vainajala

    Passive audio filters

    Hi, I have in mind building small 2-way loudspeakers to my stereo system, because the old speakers are in so bad condition. The bass-element's foam surround has come really "weak" and it has many holes even though the surround hasn't been touched by hand practically at all! The loudspeakers are...
  3. vainajala

    Unknown component(s)

    Hi all, These components are from old PC power supply, the problem is that I can't find any info about the left component in the picture. The right one seems to be PNP Darlington transistor... Could someone help a bit?
  4. vainajala

    Small plasma experiment

    I found this simple "OAUGDP" plasma panel experiment. It's quite a simple device but it looks cool in my opinion! ;D Has anyone tried to built anything like that? Anyway, nice use to a unused ignition coil lying in a junkbox... http://jlnlabs.imars.com/plasma/html/s_gdp1.htm...
  5. vainajala

    Switching power supply

    Hi all, I thought about building a power supply for a thermoelectric (peltier) cooler element, which maximum power is 122W @ 15,7V (~7,8A). I have a toroidal transformer whose ratings are 300VA and 2x35VAC, so dropping the voltage from about 40VDC (or something, I don't know the  exact voltage...
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