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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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16th Sep 2017, 12:17 am | #1 |
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
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Phenolic PCB tracks & transistors.
I thought I would add this information/technique to the forum. It was developed to preserve the tracks on vintage phenolic pcb's where transistors mount. It also results in some germanium transistors with long leads being able to be fitted with zero soldering/heating. I did this for my Eddystone EC10 radios and it made it easy to try multiple transistor types.
A jig is made with a piece of old electrical bus bar and pcb pins and a screw down brass wire clamp is added. This makes a tool for forming the transistor leads to the exact spacing as the hole array in the pcb. Brass hex head screws are used with the head side on the track side and a a nut is used on the component side and the heads soldered over. Another nut & washer is used to secure the transistor. Its also easy to make a mini socket wrench from an Allen head screw soldered to a screwdriver end with a brass tube section. The attached photos tell the story: |
16th Sep 2017, 10:20 am | #2 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,853
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Re: Phenolic PCB tracks & transistors.
What a wonderful idea, well executed. Thanks for sharing.
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16th Sep 2017, 4:03 pm | #3 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,005
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Re: Phenolic PCB tracks & transistors.
Nice one: Most cunning, functional, and neat-looking too!
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16th Sep 2017, 4:38 pm | #4 |
Pentode
Join Date: Aug 2005
Location: Shrewsbury, Shropshire, UK.
Posts: 149
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Re: Phenolic PCB tracks & transistors.
Inspirational -- thank you very much for posting this.
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16th Sep 2017, 4:56 pm | #5 |
Guest
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Re: Phenolic PCB tracks & transistors.
The sockets from turned pin DIL headers also do the job
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16th Sep 2017, 5:39 pm | #6 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
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Re: Phenolic PCB tracks & transistors.
Looks neat but I'd be worried about nuts falling off and shorting things out.
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16th Sep 2017, 9:54 pm | #7 | |
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
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Re: Phenolic PCB tracks & transistors.
Quote:
Also, and I'm not 100% sure if this is true, or not, it seems that very small sized screws and nuts, with a very low mass seem to uncommonly come loose. For example in watches & clocks with many of these they appear to stay put most of the time without thread lock or lock washers. It would be interesting if anyone has a theory on why this might be or even if this observation has any merit , perhaps something to do with F=Ma? Last edited by Argus25; 16th Sep 2017 at 10:06 pm. Reason: Ask a question. |
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16th Sep 2017, 10:14 pm | #8 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Phenolic PCB tracks & transistors.
Weight/thread slope ?
Lawrence. |
16th Sep 2017, 11:23 pm | #9 |
Dekatron
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
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Re: Phenolic PCB tracks & transistors.
Thin parts deform more easily and provide a similar effect to spring washers?
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