This video describes, in detail, how to construct a Current Limiting Device to protect you, your test equipment, and any electronic gear that you are testing or repairing. When used properly, it prevents short circuits from causing additional damage, particularly to expensive power transformers in amplifiers. It is also quite useful when first powering up previously untested and vintage equipment. It is not suitable for use with medium to large electric motors.

The bulb functions as a high-wattage resistor in which the resistance increases with the increasing heat of the filament. A "cold" bulb may offer only 2 or 3 ohms of resistance (the higher the wattage, the lower the resistance), but this will rapidly rise as the filament heats, particularly in the case of a short circuit.....protecting the circuit and dissipating the resulting filament heat in the form of light (warning you of the existence of the short).

IMPORTANT NOTE: The wattage of the bulb must be tailored to the current draw of the device being protected. The high-wattage bulbs (200W+) recommended in the video are primarily for Tube Amplifiers, which operate at relatively high current levels. With lower-current devices, such as Solid State amps, a lower wattage-higher resistance bulb (even as low as 40W) may be required for circuit protection.

For viewers in areas with 220-240VAC power: Although your voltage is double (220VAC vs 110VAC), your current flow is about half. Since the Current Limiter (CL) depends on current to rapidly heat the filament and increase its resistance, you need a bulb with higher filament resistance. Since the filament resistance of the bulb decreases with higher wattage, you should try a lower wattage, higher resistance bulb.....i.e. a 100W......initially, and then fine tune the wattage depending upon the power demands of the amplifier being protected.

Also, in my wiring diagram within the video, the "hot" AC lead is connected to the threaded socket of the receptacle, which could possibly be touched while changing bulbs. Some viewers have suggested that shock exposure could be reduced if the "hot" lead went to the contact at the bottom (center) of the socket. Please consider this when wiring your own Current Limiter.


The Photoflood Bulb used in this video is available on Amazon. Here is a link: http://www.amazon.com/Eiko-Sup....reme-Photoflood-Ligh

If you enjoy seeing videos featuring classic vintage jukeboxes and guitar amplifiers, please consider subscribing to my channel, to gain easy access to over 100 related videos and to be notified when new videos are posted. Thanks for watching !!!

In recent years, we’ve seen an uptick in research on electronic skin or e-skin.

E-skin is worn over human skin and can be used to garner information about bodily conditions, such as heart rate, blood pressure, and other biometrics.

Now, scientists have made it possible to power e-skin with sweat.
With this new approach to power the e-skin, it is no longer hampered by unreliable power sources.

This development will make it easier to develop new possibilities for wearables of all descriptions.

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This is a simple Arduino project anyone can try at home.
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Ultrasonic sensor:
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Recommended soldering iron- TS100:
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In this video, lets connect the HC-SR04 Ultrasonic sensor to our Arduino and learn how to code the ultrasonic sensor. We also learn how to run the sensor.
The ultrasoinc HC-SR04 sensor can be used to make obstacle avoidance robots, or ultrasonic radar or other ultrasonic arduino projects.
This tutorial for the HC-SR04 sensor should teach you how to code easily and build your arduino projects.

Ultrasonic cleaners are useful cleaning tools, however, unless you want to fork out significant coin, the sub $100 units are good for jewelry and little else.

Although they work well, their size limits what can be cleaned.

So I decided to build my own 15.1 Litre or 4-gallon Ultrasonic cleaner; this will better fit the items I want to put through the cleaner. And the best part - I did it for less than $100.00.

This video details the process I used to build my sub $100 Ultrasonic cleaner.

The process is simple and requires few tools to assemble. The hardest part of this build was the optional wheeled trolley that was built to accommodate the ultrasonic cleaner.

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How to make ultrasonic mist maker fogger - Very Simple way
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-Mist Maker Fogger
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Build your own Ultrasonic range finder with Arduino, step by step process with components, circuit, code and output. Please visit below link for more details.
http://www.electronicshub.org/....portable-ultrasonic-

If you have always wanted to know how ultrasound can clean so intensively while being gentle on materials, you will get the answer here. Compared to other cleaning methods, ultrasonic cleaning saves time and money and is also particularly environmentally friendly.

BANDELIN specialises in the development, manufacture and distribution of high-performance ultrasound equipment for medicine, industry and laboratories, as well as corresponding accessories and application-specific cleaning and disinfection products.
Further interesting information on the subject of high-performance ultrasound and on ultrasonic cleaners can be found here: https://bandelin.com/ultraschall/.
Our brands (SONOREX, SONOPULS, SONOMIC, TRISON) are equated with ultrasound in professional circles. Already 79 patents and utility models prove our outstanding innovative strength.
The constant further development of our products and applications not only made us the market leader, but also allowed us to set the norms and standards for ultrasonic applications in various committees.
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Ultrasonic Cleaner
Item #: 82413

The Fast, Easy Way To Clean Small Parts
This is a true ultrasonic cleaner that uses energy in the form of sound waves to create literally millions of tiny, microscopic bubbles in the cleaning solution. These bubbles expand and collapse 46,000 times a second to create a mechanical 'scrubbing' action that works its way into the smallest holes and hidden cavities, loosening and washing away dirt and grease from all surfaces that the solution touches. Includes a 2 inch deep, 3-1/2 inch x 6-1/2 inch stainless steel tank, parts basket, automatic shut-off and plastic cover. Ideal for cleaning airbrushes, model railroad components, R/C engines, instrument and clock parts, coins, eyeglasses and jewelry. Plugs into standard 120v AC household outlet. Power consumption: 50w. For best results, use with #81870/#81871 Ultrasonic Cleaning Solutions sold separately. (Not for use with volatile solvents.)

https://www.micromark.com/Ultrasonic-Cleaner

Ultrasonic Cleaning Solution Concentrate
Item #: 8187M

https://www.micromark.com/Utra....sonic-Cleaning-Solut

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