#potentiometer

[guitar-ijiri-house]

【Yamaha Day】1970-80年代ヤマハバイサウンド対応！入手困難な300kΩスイッチポットを発見!! | ギターいじリストのおうち

毎年10月12日はヤマハ株式会社の設立記念日Yamaha Day！1970～80年代のヤマハ製エレキギターに搭載されたバイサウンドシステム用スイッチポットに熱視線！特殊な設計で現在...

2025年にヤマハバイサウンドが蘇る！

長年入手不可と思われた新品300kΩスイッチポットを発掘しました！

ヤマハファンはギタいじに集合！

読もうか👉 https://guitar-ijiri.com/blog/gakki-ijiri/yamahaday_20251012_bi-sound_system_300kohm/ 【Yamaha Day】1970-80年代ヤマハバイサウンド対応！入手困難な300kΩスイッチポットを発見!! | ギターいじリストのおうち

[othmeralia]

Hello, I stumbled upon this Photo of a Honeybee sitting on or probably detecting a certain material. But I can't find a description of the experiment the photo was taken from. Could you give me some Info about that?

Hello! Thanks for your question! If you are referencing thephoto above, what you are seeing is a bee posed on a Beckman Helipot Model 77PHelitrim trimming potentiometer. The photograph is part of a series ofmarketing images used to demonstrate the small size of Helipot products, inthis case a trimmer potentiometer. 

You can learn more about the image in our  Digital Collections. Hope this answers your question! And if it doesn’t, please feel free to send us a message at [email protected]. We are here to help.

[quartz-components]

Preset Potentiometer (Trimpot)

A Trimpot is another type of potentiometer that comes in small package. It has three leads and can be easily mounted on breadboard or perf board for quick prototyping. The value of the pot can changed by varying the knob on top of it.

Learn more about trimpots: https://components101.com/resistors/preset-potentiometer-trimpot-pinout-datasheet

[magicclam]

Hey everyone.

It’s quick restoration time! 

Back when I took my trip to Washington state to pick up that collection of vacuum tubes, I also grabbed a bunch of potentiometers. Included in that collection were a couple really old porcelain ones. As you can see from the pictures, they were in pretty bad shape.

As I mentioned in my previous post, it’s been a rough couple of months and I needed something to do that I could finish quickly for that sense of accomplishment. So a few nights ago I decided to try to restore one of them.

I started by figuring out how to take it apart. The knob had 2 set screws which had rusted to the point they were fused with the shaft. At first I tried drilling out the screws to see if I could get the knob to loosen, but that didn’t work. So I ended up just using a hacksaw to cut through the shaft. This took almost half an hour. I need to get a new hacksaw blade. :\

Most of the metal parts had rusted pretty badly and the spring that held the wiper (bent copper part in the last pic) to the contact (copper ring under the bent metal part) had disintegrated. My wife had given me some steel wire at some point (I don’t remember why) and I was able to use that to create a custom spring.

Then I had to drill out the rivet that held the contact to the porcelain body. After that I de-rusted all of the parts and polished up the copper. Lastly I put the whole thing back together and now I’ve got a working 2500ohm potentiometer that I can use for... something. Huzzah!

That’s it for now. Work will continue on the Philco 39-45 when I’ve got some time and energy for it. Until then, stay tuned!

[hexmoire]

[quartz-components]

3296 Trimmer Potentiometer

Trim pots are also known as preset potentiometers used for adjustment, calibration and tuning purpose in circuits. They are easily mountable on PCB boards and adjusted by a screwdriver. The resistive track is made up of carbon composition or cermet. When replacing with normal potentiometers, remember their life span is not so long. 

Learn more about trimpots here: https://components101.com/resistors/3296-trimmer-potentiometer-pinout-datasheet

[othmeralia]

So, what is a Cutoosy Pres. Pot?

Trick question. It’s a typo. If you flip the photograph over, you find a handwritten inscription.

“Cutoosy” is actually “cutaway.” (“Pres.” still looks kind of like “pres.” but based on familiarity with electronic components, it can be deciphered as “prec.” for “precision.”) 

It’s an understandable mistake; the handwriting is not neat. But this is an excellent illustration of how errors can creep into business documents---and later be corrected by heroic, knowledgeable archivists! 

(I’m not claiming the credit in this particular case---the photo album inventory did not replicate the “cutoosy” typed on the photo’s label---but there are other cases where I’m totally the heroic and knowledgeable one.)

[othmeralia]

One fun aspect of project work is becoming deeply familiar with a particular collection. I have seen a lot of photographs of passive electronic components, many of which will be included in our digital repository (the others, duplicates or near-duplicate shots, will continue to be available to researchers using the Beckman Historical Collection).

One useful side benefit of flipping through these photo albums while doing metadata work is that sometimes, a shot will seem familiar. In this case, the out-of-focus dials serving as a background for the floating potentiometer seemed familiar. I searched the repository and confirmed that about a week earlier I had described an in-focus shot. I was able to create a relationship between the photographs. I find the detail interesting---and so might some of our researchers. It may not say much about passive electronic components, but it does say something about mid-twentieth-century corporate photography.