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Author Topic: Unknown electronic symbol  (Read 1206 times)
K8AXW
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Posts: 7036




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« Reply #15 on: July 08, 2019, 08:49:39 PM »

According to the new owner of the power supply they are indeed connectors for components and jumper wires in the power supply.  He of course doesn't know the name of them but they're quite similar to terminal strip contacts but not fastened together.

You nailed it Glenn.

Thanks to all for their suggestions or opinions.  I have never seen this type of connector or the symbol during my 63 year ham career

The BASE resistors (2.2 ohms) might be needed because of the driver used/I don't have a clue but my buddy and I plan to install emitter resistors during the clean-up and repairs.
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A Pessimist is Never Disappointed!
W6EM
Member

Posts: 1940




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« Reply #16 on: July 09, 2019, 03:55:05 PM »

Actually, the spade connectors are quite useful when removing and reinstalling the control board.  We Pyramid owners appreciate all the help we can get....  :-)
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K8AXW
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Posts: 7036




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« Reply #17 on: July 10, 2019, 08:20:35 AM »

EM:  Have you installed or considered installing emitter resistors in your Pyramid?
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W6EM
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Posts: 1940




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« Reply #18 on: July 10, 2019, 04:47:58 PM »

Yes, on several.  In a couple of PS-35's and a new PS-52 rack mounted supply.  Also, removed the "paralleled" bridge in the 52 and replaced it with two 70A stud rectifiers on a very large sink.   I also replaced the single #14AWG wire that was supposed to carry full load current.  :-(

And, added a 40V zeners ahead of the LM723 regulators and the reversed biased diodes across the output transistors.

Approaching Astron's design concepts.

I don't recall the values.  On the 52, I think I used either 0.1 or 0.05 ohm.  I can't recall now.  Probably 0.1.







 


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W9GB
Member

Posts: 3368




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« Reply #19 on: July 11, 2019, 05:17:44 PM »

Connection Points (Wire to Board) on a Common PC Board (silk screened, ideally).
Obviously an Asian derivative, possibly for assembly/production usage.

PYRAMID brand name has left the marketplace (remaining units closeout sale)
http://www.pyramidcaraudio.com/

Quality Car Audio
https://www.qualitycaraudio.com/
5314 16th Ave #083
Brooklyn NY 11204 USA
Phone: 718-291-4142
e-Mail: Sales@qualitycaraudio.com

SoundAround of Brooklyn, NY are same owners ... good luck.
http://www.soundaroundusa.com/

PYRAMID POWER SUPPLIES
Documents at Repeater Builders TIP
http://www.repeater-builder.com/pyramid/pyramid-index.html
« Last Edit: July 11, 2019, 05:28:18 PM by W9GB » Logged
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