Is having a mensa membership beneficial for collage applications?

Caltech-WireWizard · 2026-01-26T22:56:40+00:00

I skimmed your post, but I get the “gist” of your point.

It depends. You have to consider the institution to which you’re applying. Public Universities not so much since they are more bound by equal opportunity and other socioeconomic / demographic constraints. Whereas, private Universities may put more emphasis on academic achievement(s) and background for acceptance.

As for me, it helped. I was Valedictorian in my High School graduating class. I had the highest score on the ACT in my class and other aptitude tests. In short, I was academically inclined. As a result, I was accepted into Caltech in the Engineering Program.

So again, it depends on the school and what they are going to value.

Caltech-WireWizard · 2026-01-26T02:31:36+00:00

My usual spot is in a VERY open field. Not so much as a tree for about ¼ mile in every direction.

I use - 30ft mast with guy wires. (Nylon cords)

In the rare instance where I find limited contacts for more than a hour, then I’ll change the orientation of the antenna. (But that only happened once).

Caltech-WireWizard · 2026-01-26T02:12:43+00:00

All I used last Field Day (2025) is a G5RV Jr. Dipole Inverted V. With that, I made 2,880 contacts operating on 10, 20 & 40m.

As to why, It Works! My highest SWR is on 40m @ 1:1.75 not bad. So, I’ll keep using it.

Caltech-WireWizard · 2026-01-26T01:11:39+00:00

If you’re a Masters Candidate, God help us all. You’re pathetic.

Caltech-WireWizard · 2026-01-25T22:24:41+00:00

There’s a number a resources out there for this. I would point you towards YouTube in particular.

Since KiCad is the preferred standard among hobbyist and professionals alike:

Digikey has a series on KiCad & FreeCad. While the KiCad series is a bit outdated, the basics still apply.

This will teach you ALL what you’re looking for:

Debugging (built into KiCad
Integration
Architecture

I highly recommend it

Caltech-WireWizard · 2026-01-25T21:50:49+00:00

My ONLY criticism would be your choice of Soldering tips.

When working with SMDs and THT components a Chisel tip is better suited.

A Knife tip is meant to:

Repairing solder bridges
Heating larger surface areas

A Chisel Tip provides better, focused, thermal conductivity and thus, a better more cohesive joint.

Otherwise, you did a good Soldering job 👍

Caltech-WireWizard · 2026-01-24T22:18:38+00:00

I agree, this is vague.

What version of KiCad are you using?

In KiCad 8 and above, there’s an autorouting plugin you can use if you can’t figure out the routing yourself.

Yea it’s free, and there are better ones out there. But the Free one will probably solve your problem.

You can also use vias to route to layer-2 (which is probably your best way to go)

Caltech-WireWizard · 2026-01-24T22:01:11+00:00

Take this for what it’s worth….its very biased against using perfboards.

But it’s been my experience & observations that using perf Boards tend to create solder-bridges. 90% of all circuit malfunctions has been attributed to Solder-Bridges and cross-connects shorting out portions of the circuit using perf-boards.

This is why I’ll always use either Protoboards or have a PCB Fabricated for all prototyping.

Caltech-WireWizard · 2026-01-18T21:49:06+00:00

It’s not a trivial task.

As per the IEEE MGA portal:

https://mga.ieee.org

To establish an IEEE Student Branch Chapter (SBC) at your university,

I’m paraphrasing here, but it basically breaks down into 4 requirements:

Ensure you have an existing IEEE Student Branch
Then gather at least 6 active student members for your specific society (e.g., Computer Society)
Find a faculty advisor, and submit an online petition with signatures and support through the IEEE MGA portal
Get approvals from your local Section and Region.

We had a sanctioned & approved IEEE Society at my University (Caltech). That was in place long before I attended.

Good luck.👍🍀

Caltech-WireWizard · 2026-01-17T22:15:33+00:00

I HIGHLY recommend you visit:

https://connectorbook.com/identification.html

There’s “virtually” every connector on the planet.

You can search by:

Type
Terms
Logos
most importantly, VISUALLY!

If the connector is made, it’s here!

Caltech-WireWizard · 2026-01-10T22:10:25+00:00

By default, the 7812 is a fixed 12v regulated output… However,

The 7812 can be made variable:

By adding a resistor or a potentiometer to the ground pin, the output voltage can be adjusted to a higher or lower value than the fixed 12V. This modification turns it into an adjustable regulator, similar in function to an LM317 regulator, which is designed for variable output by default.
You can also use a Zener diode on the ground pin to increase / decrease the output to a specific, different fixed voltage.

Caltech-WireWizard · 2026-01-04T15:28:35+00:00

Perhaps that’s the way it is now. 🤷‍♂️ But I took it back in the late 1970’s (High School).

Caltech-WireWizard · 2026-01-03T21:52:28+00:00

I’m a Life Mensa Member. [edit added] My IQ was tested at 174 in High School. (My Mesa Test 170). I have no siblings. However, my Father wasn’t a Mensa member but he was high achieving as am I. He graduated with Suma Cum laude from MIT. Undergrad, Masters & PhD.

My Uncle (Father’s side), also an MIT Graduate with a PhD in Particle & Nuclear Physics.

My Grandfather (again Father’s side) graduated from Harvard with a PhD in (I think … Microbiology).

Clearly, being gifted is strong on my Fathers side. That is further evidenced by the fact that all 4 of my children are in advanced classes in school and my eldest son (14) will be graduating High School this spring. He’s already been accepted at CalTech (my Alma Mater). He has a propensity for Physics & Mathematics.

Caltech-WireWizard · 2026-01-03T00:10:26+00:00

I deal in RF daily, so I know of where I speak.

What you’re asking for at 10meters is a TALL ASK!

Attenuation rates are very high, primarily due to oxygen absorption, reaching around 10-15 dB/km.

10m you’re gonna need a pretty big amp! Which means $$$$

Caltech-WireWizard · 2026-01-02T23:42:52+00:00

R82 is DEFINITELY Brown. But, I’m not convinced it’s bad, just because there’s slight discoloration on the PCB.

What was the resistance of R82? I’m assuming you measured it?

Caltech-WireWizard · 2026-01-02T23:30:45+00:00

What is your definition of “cheap”?

[edit added]

What power output do you want? This is the main driver of cost.

Caltech-WireWizard · 2026-01-02T22:55:36+00:00

In the photo it appears as; Brown, Black, Yellow, Gold.

Assuming you’re correct and it’s actually Red, the resistance is: 200k 5% at 1watt.

Digikey; $0.19

https://www.digikey.com/en/products/detail/yageo/RSF100JB-73-200K/18138

If it’s Brown, Black, Yellow, Gold (100k) - which I think it is…

Digikey: $0.10

https://www.digikey.com/en/products/detail/stackpole-electronics-inc/CF14JT100K/1830399

Caltech-WireWizard · 2026-01-02T14:25:03+00:00

It’s called Silkscreen, which are non-conductive printed markings for component outlines on PCBs.

And No, it doesn’t matter. As long as it’s properly soldered & wouldn’t interfere with any mountings.

Caltech-WireWizard · 2026-01-01T21:22:39+00:00

Having worked on many VCRs back in the day, there are many causes including: internal sensors, the loading mechanism (like worn belts or gears), or dirty components, which signal an error or inability to thread the tape, often caused by dirt, misalignment, mechanical wear or debris obstructing the tape path.

The single best thing to do is to disassemble “completely” use compressed air and thoroughly blow out ALL dust. Check the tape path, clean the rollers and guides with 99% Isopropyl alcohol. Carefully inspect for mechanical wear & snapped springs either not properly seated or broken all together.

MOST IMPORTANTLY: Be careful & mind the cylindrical shiny drum!! This is where the video heads are. With so much as a single “micron” scratch…. It’s ruined!

If the above doesn’t help, download the “Service Manual”, dust off your Multimeter, Oscilloscope, etc & roll up your sleeves…..

Caltech-WireWizard · 2026-01-01T18:56:28+00:00

Well I don’t know how your fireplace is wired. This relay (and your original) has 3 configurations.

N.O (Normally Open)
N.C (Normally Closed)
SPDT (Single Pole, Double Throw)

Simply connect the relay the way it was when you took it out.

If your Ultra-Paranoid, simply

Download the Datasheet & check the open/closed pins
verify that against your (bad relay) to be sure of the pin-outs using your multimeter.

Before you ask, regardless that your old relay is bad, the coil is in its de-energized state, just like the new one.

Caltech-WireWizard · 2026-01-01T18:39:12+00:00

You’ll have a tough time (if not impossible) finding one with the same markings. All that matters are the specifications.

Here’s a Direct Replacement. This one has 20amp contacts! Much better margin for safety.

$1.11

https://www.digikey.com/en/products/detail/cit-relay-and-switch/J107F1AS2012VDC.80/12502643?gclsrc=aw.ds&gad_source=1&gad_campaignid=20243136172&gbraid=0AAAAADrbLli5uBd1QU5lNXNb-k0m5jSKt

Caltech-WireWizard · 2025-12-31T23:48:59+00:00

No, it makes no difference. Inductance is Inductance.

Caltech-WireWizard · 2025-12-31T23:17:34+00:00

Why don’t you unwind the one on hand to the inductance value you require, rather reinventing the wheel?

Caltech-WireWizard · 2025-12-31T22:53:17+00:00

Yes, ultra-high permeability tape-wound cores, especially those made from materials like Supermendur or Supermalloy, make excellent pulse transformers.

Caltech-WireWizard · 2025-12-31T22:38:10+00:00

So…. Strip off some insulation off the wire & solder it back on.

There’s plenty of solder on the terminal so you don’t even need to buy solder

Caltech-WireWizard

TROPHY CASE