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Discussion and news about component-level electronic circuits.Electronic systems and circuits
Updated: 7 hours 31 min ago

Project Log of My First Real PCB

Sat, 12/30/2023 - 00:40
Project Log of My First Real PCB

Hey, here’s my project log of making my first real PCB for a product im trying to design. Plz don’t roast me too hard, I’m not an electrical engineer.

submitted by /u/noam_aiz
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Vintage (to me) radar detector

Fri, 12/29/2023 - 01:23
Vintage (to me) radar detector

Nostalgia got the best of me and I picked this thing up on eBay in an unknown state. Powering it up it seems to be in a continuous state of alarm. Unless I have a K band source in my basement I'm pretty sure this thing is on the Fritz.

My favorite part is that the big red light indicator is an incandescent light because it's from the 1980's and LEDs were not what they are now.

For what it's worth, it's pulling about 280mA at 12.5v. That seems reasonable for this thing but I'm not sure what to expect or how to go about debugging the alarm. Not that I'm going to get any practical use from the device.

submitted by /u/iamnotatigwelder
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Where is this all going? Where is electronics heading?

Thu, 12/28/2023 - 06:08

Hello everyone,

I recall a time when the previous generation was engrossed in constructing radio receivers, electric guitar effects, and similar projects. During my student years, many peers with a passion for electronics busied themselves with creating audio amplifiers, basic spectrum analyzers, disco lights that synchronized with music beats, strobe lights, and the like.

Following the audio-centric creations, programming AVR microcontrollers became the trend. Nowadays, there's a growing fascination with the Internet of Things (IoT). It leads me to ponder: what will capture our interest next?

submitted by /u/Inevitable-Bid-3029
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Capacitor launched into orbit

Thu, 12/28/2023 - 04:43
Capacitor launched into orbit

“Dad, can you fix this?” I’m afraid not 😳 Bliss Lights Sky Lite projector, the capacitor was launched into orbit and the connector for the LED board had melted.

submitted by /u/kd5pda
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Making a light dumber so I can make it smarter

Wed, 12/27/2023 - 16:31

Bit of a long shot here, but I’m looking to add a smart switch to this light. It faux neon light (I’m assuming it’s LED). It was a gift to add decoration to my music room / office. The challenge is that it has a dimmer / on / off switch. The connection is USB and a standard base powers it. When you turn it on. The challenge is that if you turn it on and remove power (like from turning off a smart plug, which was my plan), when you return power, it automatically sets itself to off, so you have to hit the button on the switch (which I’m never going to do).

So, my question is, does anyone have an opinion on what may happen if I bypass the switch (desolder the leads and simply connect them together)? I believe it’s a simple circuit and the switch probably adds some sort of resistors to increase or decrease power, which I would gladly bypass if it meant I could just tell Alexa to turn the thing on.

TLDR: any concerns in removing the dimmer switch from this thing and directly applying power?

submitted by /u/scottfishel
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Buzzer music visualized!

Wed, 12/27/2023 - 03:11
Buzzer music visualized!

For fun I hooked up an ornament gift my girlfriend gave me to an oscilloscope to view the passive buzzers output. It's stuff like this that can explain so much about how things work. I thought others would enjoy, happy holidays!

submitted by /u/Martarts
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LEDs as muon detectors

Tue, 12/26/2023 - 20:58
LEDs as muon detectors

Negative voltage puts the LED in avalanche mode. When a cosmic ray hits, current mirror charges the cap. Then positive voltage allows the cap to drive the LED via n channel MOSFET.

submitted by /u/Advanced_Tank
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Philips Electronics Kits from the 90s

Tue, 12/26/2023 - 00:42

Does anyone remember the Philips Digital Lab and Fun with Electronics kits from the 90s?
They came with computer software which explained in great detail how all of the circuits worked, and I played with them a lot as a kid. Some of the projects were making random number generators, metal detectors, and making memory with the logic gates.

They won awards and were really good, and yet I can't seem to find a trace of them on the internet. And I've never been able to find an electronics kit that is just as good, so it's a shame they don't make them anymore.

submitted by /u/Few_Woodpecker866
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Microwave high voltage capacitor replacement

Mon, 12/25/2023 - 13:19
Microwave high voltage capacitor replacement

Hi experts, does anyone know how important the exact value of an microwave high voltage capacitor (2100V) is? Samsung didn't print the capacity on it and I can't find any schematics. They are common between 0.95μF and 1.25μF (and the vast majority are 1μF) what could worst case happen if I use a higher or lower capacity value for replacement? (The left connector is coupled to ground with a high voltage diode I assume it's a voltage doubler circuit after the transformer and before the magnetron.)

Any help appreciated.

submitted by /u/DeeSaR47
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