Heat sink

Discussion in 'General Electronics Chat' started by Web Goblin, Sep 11, 2010.

  1. Web Goblin

    Thread Starter New Member

    Aug 29, 2010
    Hi all,
    I am a bit new to building electronic circuits but have decided to have a go at a 0-30v 6 amp dc power supply. I have built most of the circuit on stripboard and I am about to mount the 2N3055 and the power resistors.
    The question I have is can anyone see any problems with me mounting the transistor and resistor on the same heatsink beside each other or does this not really matter? The heatsink will be insulated from the surrounding casing and I am planning to use two 40mm dia fans for forced cooling.


  2. bertus


    Apr 5, 2008
  3. PackratKing

    Well-Known Member

    Jul 13, 2008
    Definitely use the fans. I have a gang of six LM317s wired in paralell on one of my 0 - 24v variable bench supplies, attached to a rather massive heatsink with a 12v PC tower fan...... I tend to lean toward overkill engineering is these situations............Haven't heard so much as a peep out of the regs if I happen to step on them a little too hard :p
  4. SgtWookie


    Jul 17, 2007
    Your stripboard traces that are carrying even as much as the base current for the power transistors will become fuses when you apply a load to the circuit; burning open almost instantly.

    You will need to reinforce your stripboards' current carrying ability by soldering some bus wire on top of the traces so affected. AWG22 is good for up to 5A.
    PackratKing likes this.