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  1. Paul_J

    Audio amp quiscent current

    I replaced a STK3062 in a Marantz PM-52SE power amp with another module. The output DC offset voltage is 0 but the quiscent current in 700mA.  :o What should I do to reduce it to 70mA? Here's a list with the values of the components of the replacement module: R1______________47K  1/4W...
  2. Paul_J

    Heatsink Surface Area

    How can I determine the approximate thermal resistance of a heatsink if I know its surface area?  ::) I searched the web and the most useful thing I found was this http://www.jaycar.com.au/images_uploaded/heatsink.pdf but it doesn't answer my question.
  3. Paul_J

    Power dissipation limiter

    Wishing to build a variable DC power supply with current limiting I came across this problem: when the output is short circuited to ground and with the current limit set to maximum the series pass element (in this case a transistor) has to dissipate all the power so it requires a big heatsink...
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