jstbrowsin wrote:Thanks Pokey Pete and Dr Nomis for your input. Most appreciated.
I guess I should have been more specific with my info, the caps that blow are the C1 & C2 and they are rated at 63V, in turn they also blow the 2N3055 T03 transistors that have a huge heatsink. The LM317's are T package and there are no heat sink's attached but I can remedy this . The filter caps are rated at 75V so I think they should be safe too eh.
Ok so going on your advice I change the LM317T in the neg supply to LM337T and add heat sinks.
Would it also be advisable to double the size of resistance (R1-R2) to slow the current and save the transistors and everything else?
DrNomis wrote: I also noticed that,if the two outputs ate connected to obtain positive and negative supplies,the ground connection will be floating.....
Pray do tell how can I remedy this please?
Thanks again for all you help guys
75V Caps will be fine as the filter caps,I tend to over-rate the components for the job when I design circuits,makes them more reliable.....
The best way to remedy the floating-earth issue,is to use a single Bridge-Rectifier circuit,you have a power transformer in your schematic that has a centre tap,connect this centre tap to ground,as in the schematic I posted,and use the other two terminals to feed the Bridge-Rectifier,the transformer Centre-Tap also becomes the ground reference for the rest of the power supply circuit,note that you then have to use the LM317/337T combination to regulate the supply rails,not two LM317Ts,the LM317/337T Adjustable regulators are rated for a maximum of about 1.5A,so to "boost" the current output capability of the power supply,you can use a 2N3055 and an MJ2955 connected as a series-pass transistor,these transistors are in TO-3 packages and are rated for a maximum collector current of 15A I believe,I'll post a schematic showing how to connect them as series-pass transistors.....