RJS Electronics Inc.

RJS Electronics Inc. Electronics has been my lifelong passion. I specialize in taking your concept from sketch to reality:

Ready to bring your device to life?

Drop me your project details/requirements, and let's chat about how I can help make it happen.

Another Happy client with a great product.
06/08/2026

Another Happy client with a great product.

What's cooking?Last week my wireless keyboard was acting up. With every keystroke it would type that character + an addi...
06/01/2026

What's cooking?

Last week my wireless keyboard was acting up. With every keystroke it would type that character + an additional character. It was consistent, repeatable, yet still wrong.
I re-booted windows, that usually fixes half of my problems. Nope.
Move the USB receiver closer? Nope.
Plug it into charge? Nope.
Bake at 125 for 15 minuets? That did the trick!
Apperantly, leaving the window opens open all night while it rained 2 feet away is bad.

Fiber Optic transmitterGlad I am not the one hand building these prototypes.
05/18/2026

Fiber Optic transmitter
Glad I am not the one hand building these prototypes.

Have you ever seen this?Polarity Reversal??I have heard of this, but first time seeing it. In the middle of a project th...
05/11/2026

Have you ever seen this?
Polarity Reversal??
I have heard of this, but first time seeing it. In the middle of a project this knock off DeWalt Li-ion battery would not charge. Of course I had to see why. In this 5S2P pack, 2 parallel cells are measuring -11.4V! All other cells have expected polarity and voltage.

















Adding a second sensor input to this VOC (Volatile Organic Compound) circuit.
04/20/2026

Adding a second sensor input to this VOC (Volatile Organic Compound) circuit.

Solar Batteries in the man cave:Tripled my capacity adding 2 additional 5KWh server rack batteries.Totaling 15KWh + 2KWh...
03/11/2026

Solar Batteries in the man cave:

Tripled my capacity adding 2 additional 5KWh server rack batteries.
Totaling 15KWh + 2KWh UPS.

The internal BMS will permit discharge down to 0°F but needs >32°F to charge. There were a couple times this winter it got below 32°F, and could not charge. Built this insulated crate to keep them all cozy, with a 10W heating pad.

03/10/2026

"𝑱𝒐𝒉𝒏 𝒉𝒂𝒔 𝒅𝒐𝒏𝒆 𝒂 𝒈𝒓𝒆𝒂𝒕 𝒋𝒐𝒃 𝒐𝒏 𝒕𝒉𝒆 𝒄𝒊𝒓𝒄𝒖𝒊𝒕 𝒃𝒐𝒂𝒓𝒅 𝒍𝒂𝒚𝒐𝒖𝒕𝒔 𝒇𝒐𝒓 𝒐𝒖𝒓 𝒑𝒓𝒐𝒋𝒆𝒄𝒕𝒔! 𝑯𝒊𝒔 𝒆𝒙𝒑𝒆𝒓𝒕𝒊𝒔𝒆 𝒊𝒔 𝒊𝒎𝒑𝒓𝒆𝒔𝒔𝒊𝒗𝒆."

𝐑𝐨𝐠𝐞𝐫

03/05/2026

"If you are looking for a Knowledgeable Electronics designer and PCB layout Company, contact John at RJS Electronics... John is our go to guy."

Craig

Another VOC (Volatile Organic Compound) design. This smells for specific chemicals.
01/26/2026

Another VOC (Volatile Organic Compound) design. This smells for specific chemicals.

Flash Back Friday #2Last week we looked at PCB artwork with mylar, tape and stickers from 1989.This is the PCB that was...
01/16/2026

Flash Back Friday #2

Last week we looked at PCB artwork with mylar, tape and stickers from 1989.
This is the PCB that was for. This was hand made, etched, drilled, and plated.
More effort than "connecting the dots" in CAD.

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Columbus, OH
43220

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