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Author Topic: Ajusting a used Bencher & What's that M4x8max bb on top?  (Read 5384 times)
WB2WIK
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Posts: 20574




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« Reply #15 on: June 23, 2010, 03:43:14 PM »

No, that wouldn't be a joke.  "M4x8 MAX" warnings (and similar) are all over the place in the electronic industry, including most likely on the sides of your mobile VHF-FM rig, if you have one, where the mobile mounting bracket would attach.

It means 8mm maximum screw length, or you'll break something inside the rig.

Similar warnings are on disk drive mounting brackets, and lots of stuff.

Although my Benchers didn't come with anything like that!
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W0XI
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Posts: 67




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« Reply #16 on: June 26, 2010, 03:20:15 PM »

Yup, the IC is a Curtis 8044 with lettering of 8312 under it. Guess I'll google that for schematic and also scope leads to speaker to verify for square wave output assemption.  It's the usual 8-ohm very small speaker, not great fidelity. Guess while I'm at it I'll see if the chip spec has a VCC spec too. 73s. Phil
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W0XI
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Posts: 67




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« Reply #17 on: June 29, 2010, 02:59:50 PM »

Yup, the chip label is Curtis 8044- 8312. Guess I'll google that. Haven't looked at that for years and years. First licensed in junior high, 1953!
73s. w0xi.
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KB1LKR
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Posts: 1899




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« Reply #18 on: June 30, 2010, 05:32:41 PM »

"So, I'm going with the M4x8 is a metric screw size..."

Yes, M4x8 = metric, 4mm diameter, 8mm long [and understood to be standard 0.7mm (for M4 anyway) pitch 60° threads]. this would be very similar in diameter and pitch to an 8-32 x 5/16" English screw.
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KG4TKC
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Posts: 72




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« Reply #19 on: July 11, 2010, 07:58:31 AM »

Hi W0XI,good luck on your Bencher with the keyer. If you should happen to decide to build another keyer,and you don't need that ol' junky Curtis chip laying around in your way,you can always QRZed my call and send it to me,,:) Just kidding OM,but I sure would like to find an 8044ABM Curtis chip cheap somewhere,,:) Good luck with your project. 73 es GL KG4TKC
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