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#1
December 18th 05, 04:39 PM
posted to rec.radio.amateur.boatanchors
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Need Pyramid P/S schematic
Looking for a circuit diagram for a Pyramid PS-50, 12-15V dc @50Amps supply.
This is marked as having been made by Tenna and has both voltsage and current meters. Any help appreciated to get this thing operational. Thanks Ralph VE3BBM |
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#2
December 18th 05, 09:30 PM
posted to rec.radio.amateur.boatanchors
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Need Pyramid P/S schematic
"Ralph Cameron" wrote in message
... Looking for a circuit diagram for a Pyramid PS-50, 12-15V dc @50Amps supply. This is marked as having been made by Tenna and has both voltsage and current meters. Any help appreciated to get this thing operational. Thanks Ralph VE3BBM Ralph - I have never seen Pyramid or Temma release to the public their schematic diagrams (BUT Astron does -- support & quality) http://www.repeater-builder.com/astr...ron-index.html IF this is a linear power supply (large heavy transformer) -- a majority of these designs are based on the common "723" regulator chip [IC] (originally designed by Fairchild Semiconductor in the 1970s) with 2N3055, 2N3771 or 2N3772 transistors on external heatsinks serving as the "pass" transistors. [LM723 is the Signetics number]. Pyramid likes to solder this chip to PC board-- which I replace with socket for future service. You will find most of the information you require on the KBT DC Supplies web site http://www.kbt-dc-supplies.com/index.php David Metz's classic 1996 web page on linear power supplies. http://www.seits.org/features/pwrsup.htm g. beat w9gb |
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#3
December 18th 05, 09:32 PM
posted to rec.radio.amateur.boatanchors
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Need Pyramid P/S schematic
"Ralph Cameron" wrote in message
... Looking for a circuit diagram for a Pyramid PS-50, 12-15V dc @50Amps supply. This is marked as having been made by Tenna and has both voltsage and current meters. Any help appreciated to get this thing operational. Thanks Ralph VE3BBM David Metz's schematic http://www.seits.org/features/pwrsup.gif |
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#4
December 19th 05, 03:02 PM
posted to rec.radio.amateur.boatanchors
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Need Pyramid P/S schematic
On Sun, 18 Dec 2005 10:39:58 -0500, Ralph Cameron wrote:
Looking for a circuit diagram for a Pyramid PS-50, 12-15V dc @50Amps supply. This is marked as having been made by Tenna and has both voltsage and current meters. Any help appreciated to get this thing operational. Thanks Ralph VE3BBM I have a schematic of the Pyramid PS-25G that I can scan and E-mail. Let me know. 73 de Sieb VE3JUA |
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