From: pcdhSpamMeSenseless@electrooptical.net   
      
   Jeroen Belleman  wrote:   
   > On 12/20/25 11:56, Arie de Muijnck wrote:   
   >> On 2025-12-19 09:05, Jasen Betts wrote:   
   >>> On 2025-12-13, Christopher Howard  wrote:   
   >>>> I started playing around with deadbug and found that it is convenient   
   >>>> and not as difficult as I imagined. However, I am wondering what to do   
   >>>> as far as connectors, i.e., if I have a few lines coming in from off the   
   >>>> board, but I don't really want to clip them right onto the IC pins or   
   >>>> component wires.   
   >>>   
   >>> for structural stuff "silver" paperclips are good.   
   >>>   
   >>>> Does somebody have any good ideas for me? Maybe is   
   >>>> there some kind of terminal post out there that can be soldered onto the   
   >>>> ground plane, without actually making an electrical connection to it.   
   >>>   
   >>> 10M chip resistors might work for some tasks.   
   >>>   
   >>>> Or, maybe one that could be screwed into the copper (after drilling)   
   >>>> without making an electrical connection to it? Or maybe something else   
   >>>> involving quick connectors or other nice connectors. I'm basically   
   >>>> wondering what kind of connectors I could mount on the copper sheet   
   >>>> without having the connector conducting to the copper.   
   >>>   
   >>> If you use a connector that has a shell (like USB or DE9) you can   
   >>> often solder the shell to the board (or to paperclips etc)   
   >>>   
   >>> some connectors have mechanical support pins that do not connect   
   >>> electrically.   
   >>>   
   >>> sometime I push the end pind back throuh a pin header and solder them to   
   >>> the ground plane   
   >>>   
   >>> 5-minute epoxy glue is non-conductive. Hot glue is less rigid but faster.   
   >>>   
   >>   
   >> Instead of 10Mohm it is better to use e.g. 0.1pF SMD capacitors as   
   >> standoffs.   
   >>   
   >> 100pcs 0603 SMD Capacitor ñ0.25pF 50V COG 9.1pF 9pF 8.2pF 8pF 6.8pF 6pF   
   >> 5.6pF 5.1pF 5.0 4.7 4 3.3 3 2.2 2.0 1.8 1.5 1 0.75 0.5pF - AliExpress   
   >> ÿ1000 pcs for   
   >> EUR 11 including shipping to NL. USA may be more expensive depending on the   
   king's mood.   
   >>   
   >> Arie   
   >>   
   >   
   > 0.1pF is about twice the capacitance of a single PCB pad for a 1206   
   > SMD footprint on ordinary double-sided FR4. One wonders why such   
   > small values even exist.   
   >   
   > Jeroen Belleman   
   >   
      
   Pad capacitance goes basically to ground, but that 0.1 pF can go anywhere   
   you like.   
      
   I use 0.1-0.3 pF caps routinely in front ends, for controlling frequency   
   response and injecting small signals.   
      
   Cheers   
      
   Phil Hobbs   
      
   --   
   Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /   
   Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics   
      
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