AeroElectric-List Digest Archive

Fri 06/24/16


Total Messages Posted: 3



Today's Message Index:
----------------------
 
     1. 05:10 AM - Re: OT: PCB coating removal (rampil)
     2. 08:29 AM - Re: Re: OT: PCB coating removal (rayj)
     3. 05:30 PM - Re: Re: OT: PCB coating removal (Robert L. Nuckolls, III)
 
 
 


Message 1


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    Time: 05:10:02 AM PST US
    Subject: Re: OT: PCB coating removal
    From: "rampil" <ira.rampil@gmail.com>
    I don't recall a crystal in my old 1013A, but be that as it may, it seems odd that someone would use an xtal to generate audio tones unless they needed extraordinary frequency precision (an a lot of divider steps). You might try a bit of MEK on a corner of the board. it should not hurt the components, but might remove the PCB and component printing. The old potting compounds were pretty resistant to attack. -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=457398#457398


    Message 2


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    Time: 08:29:37 AM PST US
    Subject: Re: OT: PCB coating removal
    From: rayj <raymondj@frontiernet.net>
    Thanks Ira, I'll give mek a try. The board is from an old telephone lineman's test hand set so it's generating 12 tones for dialing. Raymond Julian Kettle River, MN The things we admire in men, kindness and generosity, openness, honesty, understanding and feeling are the concomitants of failure in our system. And those traits we detest, sharpness, greed, acquisitiveness, meanness, egotism and self-interest are the traits of success. And while men admire the quality of the first they love the produce of the second. -John Steinbeck, novelist, Nobel laureate (1902-1968) On 06/24/2016 07:08 AM, rampil wrote: > > I don't recall a crystal in my old 1013A, but be that as it may, it seems odd > that someone would use an xtal to generate audio tones unless they needed > extraordinary frequency precision (an a lot of divider steps). > > You might try a bit of MEK on a corner of the board. it should not hurt the components, but might remove the PCB and component printing. The old > potting compounds were pretty resistant to attack. > > -------- > Ira N224XS > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=457398#457398 > >


    Message 3


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    Time: 05:30:04 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: OT: PCB coating removal
    At 10:27 AM 6/24/2016, you wrote: > >Thanks Ira, > >I'll give mek a try. The board is from an old telephone lineman's >test hand set so it's generating 12 tones for dialing. Brings back memories . . . the DTMF tone encoders of bygone times were indeed crystal controlled. Here is an exemplar component. http://tinyurl.com/hzxdjgw Very popular devices in the ham radio repeater communities 40 or so years ago. Bob . . .




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