Conventional power supply with a normal mains transformer, constructed to feed a laptop that is used in radio applications. Normal computer power supplys are mostly switching power supplies, operating on approx. 50 Khz or so. They can create huge radio noise and disturbances when you use them near a (Shortwave) radio, because the squarewave creates spikes and harmonics over a broad frequency band. Construction: mains transformer, bridge rectifier, 2 trans Darlington with a zenerdiode from basis to earth, over the zenerdiode a capacitor from approx 220 uf + a capacitor of 100N. In the video I tell about the zener, perhaps this is not clear. what I mean is this: I took the voltage to feed the stabilizing circuit only 2 Volts higher as the zener voltage and used a resistor. This for the case that the zener eventually burns out. In that case the computer is not damaged by the higher voltage that can occur in that case. The car lamp is my short circuit protection. If you watch this video on another channel as You Tube, please check youtube for the original content and possible changes in the text.
Powered by hand crank, solar, 3AA batteries, or using a wall plug
AM: 520 ——1710KHz
FM: 88– 108 MHz
TV Audio: Channels 2-13
4 Continuous short wave 4.00 to 26MHz
Product DescriptionStay prepared and informed with the KA 009 from KAITO. If the power goes out and batteries aren’t available, the KA 009 can function for up to an hour with only two minutes of hand cranking or an hour’s exposure under direct sunlight Its built-in generator means that even in the most desperate situations, you’ll still have access to local news and information–as well as to news from around the world. The unit’s 10-band tuning receives AM, FM, SW 1-4, TV 1/2, weathe. . . More >>
4 power options; hand-crank generator 3 AA batteries AC adapter (not included) or NiMH battery pack
Tunes AM/FM and 7 shortwave bands including weather radio
Features emergency lights plus a flashing beacon mode; built-in siren for emergencies
Tuning knob features a superimposed fine tuning control knob
3.5 mm cell phone charger output jack (includes other plugs); 1-year warranty
Product DescriptionYou don?t need batteries to power this device. Just turn the crank to tune into AM and FM radio, plus seven bands of shortwave. The crank also powers the built-in flashlight, so you?ll never be caught in the dark. And you?ll never be caught with a dead cell phone battery. Plug the phone in, and with a few turns of the crank, you can power up your cell phone. Anytime you need to stay in touch, we?re there. You?ll be prepared for any emergency, and there?s an added be. . . More >>
www.ukqrm.org A UKQRM Production. Answering your questions about Shortwave radio or World Band Radio and the terrible interference caused by Power Line Transmissions PLT Power Line Adaptors or Power Line Ethernet. This is the UKQRM Press Release read for you by Norlei. Put simply in a non technical way
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