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Siglent SPD3303X-E Binding Post Issues - Solved

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Gandalf_Sr:

--- Quote from: bsudbrink on March 06, 2018, 01:25:21 am ---I have an early SPD3303X, ordered right before Dave's video, and it has the binding post issue.  I've tried it with a number of different leads, including real Pomonas and none work.  I was not aware that they would provide new binding posts.  I just tried to create a user account on the Siglent web site, but that doesn't seem to be working at the moment.  Is there an email address for someone at Siglent that you could provide?  Thanks.

--- End quote ---
If you want, PM me with your address and I'll mail you the replacements that Siglent America sent me, I didn't fit them as they were the same as the ones that came with my power supply.  I'll also pre-drill them out for you.

Gandalf_Sr:
So I took some measurements (all mm) on other power supplies I own, the Korad KA3305P and the Mastech HY3003.  Here's the depth (distance from front edge of binding post to start of metal tube) and aperture (ID across inside of the binding post at front).

DepthApertureKorad6.136.85Mastech5.325
Both have smaller depth and larger aperture numbers than the SPD3303X-E, both have no issues with any of my binding plugs (see next post)

Gandalf_Sr:
and now for my motley collection of banana plugs, all bought on eBay or Amazon.  I'll number them 1 - 8 from the left (bottom row).
1. (Red) Good quality binding posts from Amazon - fit with no issues, the plastic shield screws in from the front (no holes) reccd
2. (Green) Poor quality bought from eBay - these are a problem, not just in their poor fit in the binding posts of the Siglent BPs but the metal cage is loose (spins around) and this gives a poor (high resistance) connection with any binding post  - not recommended
3. (Red) Same as 2 but gold-plated - not recommended
4. (Black) Good quality bought from eBay - OK connection on Siglent BPs but much better after BP mod - recommended
5. (Yellow) Good quality piggy-back style plug - problems before Siglent BP Mod, not after - recommended
6. (Brown) same as 5 above - recommended
7. (Silver) These are great BPs from Amazon but the outer sheath is metal, if they were available with insulated sheaths they would be excellent - not recommended
8. (Red) Straight BP - unknown origin - these work well in all BPs - don't know if they are still available

All these banana plugs fit securely on my other power supplies but the loose cage style (2 & 3) are not recommended

The picture also shows 4 BPs / sockets, I'll number them 1 - 4 top row from left
1. These were bought on eBay and look similar to number 4 (the replacement Siglent BPs), they suffer from the same issue and can be modified in the same way.
2. These BPs are ubiquitous, they come with many breadboard kits, the depth is less than 2 mm (front to metal) and they are cheap - recommended
3. Obviously not a BP but included in my picture - work well - recommended
4. Siglent replacement BPs sent to me by Siglent America - better after my Mod IMHO

Ducttape:
Does anyone have a link to a specification drawing for banana plugs? I expected it to be an easy Google search but came up dry. Or is there just a verbal record that gets passed on during casual campfire talks through the years?

Gandalf_Sr:
Apparently GE invented the banana plug, there are 2 different sizes I think but the most common is 4 mm shaft size.  If you can find a definition that would be good.

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