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Velleman 7 W mono audio amplifier is constructed around the Tda2003 ic, capable of delivering 4Wrms at 4 ohms. The ic is fully protected against overheating and short circuits. A conventional direct current is sufficient as power supply.
specifications: music power output: 7W/4ohm, rms output: 3.5W/ 4ohm or 2W/8ohm, total harmonic distortion: 0.05 percent (1W/ 1Khz), frequency response: 20hz to 20Khz (-3dB), signal/noise ratio: 86dB (a weighted), input sensitivity: 40Mv/150kOhm, overload and short-circuit protected, supply voltage: 15Vdc (8 to 18Vdc possible)/0.5A. Measures 5.5 cm length by 3.5 cm width.
Set Contains:
1 x Mono Audio Amplifier
Customer
Reviewed in the United States on March 2, 2022
The kit was missing a resistor and the schematic to put it together. It was packaged that way.
ririjaja
Reviewed in France on April 1, 2019
module en kit simple et efficace et pas cheraucun souci de montagene pas oublier d'ajouter un potentiometre (non fourni) pour régler facilement le volume
Stefan Wajs
Reviewed in the United States on June 13, 2018
Same kit available at very different prices! Strange. Are they all the same? I get the feeling that I paid too much! In addition, the main reason for my 3-Star rating, is that the number of components required to complete this kit. I have had difficulty tracking-down some of the components, some of which seem to be scarce (?), and some expensive. Would be nice if a complete kit was available.
Robert Klaus
Reviewed in the United States on May 7, 2016
Took me about half an hour to build, but I have been building kits since I was a kid. I can see a problem area if you don't have a Multimeter for the resistors. They give you a chart, but it doesn't cover Gold bands in the middle, but meter read them, although tolerance was a bit off, but process of elimination confirmed the one in question. I had a blown 1W audio IC chip in a radio, the volume control was before the input, rather than wait a week or more for a chip I got this in 2 days with Prime. I used the 10.5 Volt Vcc to the blown chip and it worked 100% perfect! I was worried it would be to powerfull, but it's just the same, may have a little extra headroom to turn it up with less distortion. In my case this was for a MFJ-9406 6M Ham radio, and it also lowered the tone on the SSB hiss a added benefit in my case. I give it 3-4 Stars for the Resistor issue, and 5 for being a cool simple little kit... Photo shows it installed in right back of radio...
Rainer
Reviewed in Germany on May 24, 2016
Hatte schon 2 Verstärker zu Stereozwecken besorgt und wollte noch einen Verstärker für ein Monoradio haben wiel mich dieser Verstärker in allem zufrieden gestellt hat .Kann man auf jedenfell weiterempfehlen .Danke auch für die schnelle Lieferung !
MR STUART J BALDWIN
Reviewed in the United Kingdom on February 16, 2016
I ordered this to see if it makes a decent guitar amp. It does. I get a very respectable volume into an 8 ohm speaker from a pp3 9 volt battery, all fitted into a very small cigar box.
Well Satisfied
Reviewed in the United States on November 15, 2016
Very slick little utility amp. I built two for fill-in sound in the choir loft of our church. I run them on wall-glob 9 v. DC pwr. supplies. I've bought a couple more to build a simple stereo amplifier. Audio quality is really clean, and these puppies crank out a lot of clean, undistorted sound. Fellow Broadcast Engineers might find these especially handy as cue amplifiers, or for driving monitor speakers in office areas or small production studios. I love these guys...
ScottABQ
Reviewed in the United States on September 16, 2015
This is a fun little Velleman kit. I used it to amplify the output from an electronic keyer for practicing CW. I ran the output into a 4 ohm speaker so I have more than enough volume even when powered by a 9 V battery. I may have to swap out the 50 k-ohm variable resister for another type to control the volume better. The Velleman kit was complete, the quality was excellent, and the instructions were clear. I will definitely shop for Velleman kits again.
T. Royal
Reviewed in the United Kingdom on December 28, 2015
Very easy to solder together, even if like me you're far from expert, with clear instructions that also outline how to build a suitable PSU and add a volume control (you'll also need a 47k ohm log. potentiometer) if required. Hooked it up to the 12v line on my PSU, and the results are great - clear and surprisingly loud.
Steven
Reviewed in Germany on October 10, 2015
Easy to build. Sound is clear, bass good, highs fine, nice to listen to in my Raspberry Pi internet radio. Happy with purchase.
Doc MOJOMAN
Reviewed in the United States on June 26, 2014
This is a nice project to get your feet wet in the world of diy electronics!Other than breadboard tutorials (ala arduino starter kit(s)) and a step down dc power converter (from a schematic), this was my first diy electronics project. It was a breeze to build and the end product kicks butt! ; pI am using it to power a "Boss BRS40 4" Dual Cone Replacement Speaker" coupled with a "DS18 DS-TWR15 200 Watts Micro Dome Tweeter" (both available on Amazon) all mounted in a nice wooden box. I am having noise issues with this set up when it is powered up and no input is plugged in. I think that I can rectify this with a resistor or a diode installed onto one of the poles of the input jack.Other than the "hummm" noise issue describe above, I highly recommend this kit!
Sandradee
Reviewed in the United States on September 12, 2012
I bought this kit to modify an antique radio, and turn it into a mono amplifier for an mp3 player. The instructions are complete, including a diagram to make a power supply, (though I am using a 9v battery rigth now) and how to hook up a 50k pot. I was amazed at how loud the amp is, and how good it sounds for such a cheap kit. I attached it to a 3.5 inch 50w Boss speaker I also bought on amazon. They sound great together, especially when housed in the antique radio.
Daniel Blumenfeld
Reviewed in the United States on April 2, 2010
this little amp was easy to build and it works very well. I am using a 12v wall wart and this amp is LOUD and clear.
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