Omni Posted April 27, 2007 Report Share Posted April 27, 2007 The original design when properly built will work without any problems.I favor the latter supply over my BK supplies along with an Hp supply.Although, the BK & Hp can provide much more current, the simplicity of the 0-30V bench supply is far more useful for my purpose.Added note: as i stated in a prior post/thread it can be a teaser since it has a few very unique features.The ripple at 30V is very respectful, well within the aspect of the circuit design.I have yet to notice any problems under full load at higher voltages.Additionally, when building the supply make sure to board space any component that will generate heat; power resistors, diodes, zener's etc...The 2N2219 along with the output transistor require the proper heat sink.Obviously, with any power supply that will be used to maintain high current over an extended period of time should be carefully thermally sized.Adequate clearance must be provided for the PT, use a high quality military grade or similar; do not purchase an inexpensive one from a surplus house...Search the internet for a quality transformer, expect to pay around $45.00 - $60.00 (USA currency)Furthermore, if the output drive transistor is mounted within the case a ventilated design along with a quality DC fan should be used.Remember, fan noise can be reduced considerable by lowering the fan voltage, a small/simple DC fan control circuit consisting of a voltage divider network along with a transistor is sufficient.One could also use a darlington (TIP120) if fan current is above average. Quote Link to comment Share on other sites More sharing options...
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