Hello AROs,
I have received a lot of requests for more info on the linear supply and how to go about installing it. Sorry for the delay. My work load goes up exponentially once September rolls around. The part number of my +/- 15V 90ma supply is LZD-22 and it is from Lamda. Its actual size is 3.375" x 2.375" x 1.25". I bought two of them on EBay for $9.99. I have done some research to find something smaller but have not had any luck. I guess linear supplies just aren't sexy enough. :-( My SDR1000 is the 1 watt version and I have installed a linear 12V supply for the radio, this +/-15V supply, an OCXO and a custom board that has peak detectors for measuring fwd/rev power of my linear all inside the cabinet. I'm running out of room! If you find a really small supply let me know. Those with internal amps/tuners might consider wall warts. The DC/DC converter is located on the bottom most board of the stack. It looks like a tall 14 pin DIP device, but actually only uses 7 pins along one side of the device. I removed the boards one at a time from the top, but I think an easier way is to remove the screws from the bottom and back of the cabinet and pull the entire stack. Then working from the bottom of the stack, remove the heat spreader (an aluminum plate) and then the bottom board. I unsoldered DC1 and put a header in its place. Caution! There is not much room between the board and the heat spreader when assembled. Before you solder your connector make sure it will fit back together. I would suggest using a wire wrap socket with its leads bent 90 degrees. Of course you could solder wires directly the PCB. I only ran wires for +15V (pin 6), -15V (pin 4) and common (pin 5), but wish I had brought them all out. Then I could plug the original device back in for comparison. When I get a chance I'll post some pictures. I recommend you take a look at the schematic and board views to make sure I haven't lead you down the wrong path. Works for me, your mileage may vary. If you screw it up, just suck it up, fix the mistake and move on. 73, John k2ox -------------- next part -------------- An HTML attachment was scrubbed... URL: /pipermail/flexradio_flex-radio.biz/attachments/20060926/b8a92a1f/attachment.html _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
