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Discussion and news about component-level electronic circuits.Electronic systems and circuits
Updated: 20 min 35 sec ago

One-tube ham transmitter showing its Halloween colors

Fri, 10/27/2023 - 05:12
One-tube ham transmitter showing its Halloween colors

By day I'm a micro HW/SW guy, but by night I build tube stuff such as one-tube CW transmitters. Here's one putting out about 12W from a 6DB5 audio tube and looking very October.

submitted by /u/mopatx
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Brighter bulbs from solar/usb charged

Thu, 10/26/2023 - 22:18
Brighter bulbs from solar/usb charged

I’m looking at getting some festoon lights made from a factory in China as there’s nothing on the market with what I’m looking for (and potentially sell in the future)

For context in an electrician by trade.

Basically I want to copy some of the current solar festoon lights there are on with also usb charging but a lot brighter than anything on the market.

I’m looking at 20 metres with 20 bulbs and roughly 130 lumens per bulb. A lot of the manufacturers are finding hard to produce. Is the problem the voltage or current of the battery?

Roughly what size solar panel and battery and wattage of the globes would I need to hit these specs

Any advice welcome

submitted by /u/Specialist_Being_161
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This capacitor was like “Nope, I’m out…”

Sun, 10/22/2023 - 22:47
This capacitor was like “Nope, I’m out…”

I saw a bulge in the case and thought it was just melted, but found this exciting scenario inside!

submitted by /u/amklose
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Weekly discussion, complaint, and rant thread

Sat, 10/21/2023 - 18:00

Open to anything, including discussions, complaints, and rants.

Sub rules do not apply, so don't bother reporting incivility, off-topic, or spam.

Reddit-wide rules do apply.

To see the newest posts, sort the comments by "new" (instead of "best" or "top").

submitted by /u/AutoModerator
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Using flux when soldering

Sat, 10/21/2023 - 11:51

I posted this as a comment in Askelectronics and thought I'd bring it here for everyone to contribute to a general discussion.

Bring some popcorn, if you wish.

To all those advocating the habitual use of extra flux, please read this Digikey article because those of us formally trained in soldering are once again shaking our heads.

From my perspective:

  • Extra flux for beginners - OK until you get the hang of things.

  • Extra flux as a way of life - not so much.

From my 40-ish years of career and hobby soldering, the main reasons for needing extra flux all the time are:

  • Still learning the art of soldering.

  • Using crappy, cheap solder.

  • Diving straight into using lead-free solder.

  • Other people normalising the behavior and passing it on as the one true way.

Ultimately, do whatever floats your boat - or flows your joint - but 'mandatory extra flux' just adds cost to your work or hobby and you likely don't need it.

Anyway..have a looksee...

"Most people will seldom need to add additional flux when soldering, as they’ll most likely use a ‎solder that embeds flux in the core of the wire."

submitted by /u/Linker3000
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SMA SunnyBoy 7.7kw Grid-tie inverter

Thu, 10/19/2023 - 06:11
SMA SunnyBoy 7.7kw Grid-tie inverter

Hi there,

I’m working on a SMA Sunnyboy 7.7kw ( SB7.7-1SP-US-40)

I bought it knowing there was a issue, I have repaired a few of these in the past when there just basic component failure.

I’m trying to locate this blown out component but am basically unable to find ANYTHING online with these numbers to figure out the part number or even manufacturer.

I believe this is the H-Bridge of the inverter because it’s downstream of the DC-DC booster (it looks exactly the same as this one but is connected to the DC feeds from the solar panels, while the blown up one is connected to the AC side of things.

Is there anyone on her that’s familiar with this type of part or inverters in general?

Thank You in advance

submitted by /u/Texas_Power
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Tektronix Type 310 Oscilloscope

Thu, 10/19/2023 - 00:02
Tektronix Type 310 Oscilloscope

I believe from the mid 1950s, still powered on!

submitted by /u/Edward_T_Head
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Coolest frequency counter ever, Optoelectronics FC50

Tue, 10/17/2023 - 01:06
Coolest frequency counter ever, Optoelectronics FC50

Scored this beauty at a hamfest this weekend for $2. Was grungy a dirty. Cleaned up amazingly well.

submitted by /u/noldshit
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