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Velleman Volume and Tone Control Preamplifier Kit
Can I plug this between an amplifier line output and an amplified speaker?
Do you have an appropriate enclosure for this kit?
I would like to be able to just drill holes for volume and connectors and have a working preamp.
The enclosure depends on how you handle the power supply for this kit. If you assemble and power it as instructed by the kit documentation, you need an appropriate sized metal box(aluminum or steel) because it will need good shielding. If, on the other hand, you power it with bipolar DC (or 2 12VDC wall warts wired in series, grounding the central connection), you can use a plastic enclosure. In any case, keep the power transformer at least 6 ft. from the preamp (it can be closer if you use a toroid transformer). The enclosure size will need to be about 6 x 4 x 2 inches for ease in working inside.
Date published: 2013-01-28
Would this pair well with these power amps for bookshelf speakers?
I'd like to replace a full-size integrated amp I use for my computer office; it is failing and I really want something more compact. My speakers are Paradigm Titan bookshelf.Will this work well with either of these:Velleman 30W Stereo Audio Amplifier Kit (http://www.parts-express.com/pe/showdetl.cfm?partnumber=320-212)2x15W Class-D Stereo Power Amp Kit TPA3122 (http://www.parts-express.com/pe/showdetl.cfm?partnumber=320-322)Also, how would I switch between 3 inputs?Thanks!
This would be a better match for the Velleman Amplifier kit. The Class D is not recommended for systems that use a preamp.
Date published: 2012-12-03
I would like to use this to act as a sort of preamp for use with a Sure T-amp. Will this unit provide any gain from the input source? I will primarily be using an iPod for the source, and am currently using the iPod to control the volume. I find that if I turn the iPod up to about 75% volume it is not as loud as I would like, and anything past that is fairly distorted and "noisy".
Yes, according to the specs, you can amplify or attenuate the signal with this unit.However, the source of the distortion could be one of many things (you didn't say exactly where the distortion occurs, so I'll cover some of the possibilities I can think of):1. Some older iPods distort on bassy songs when a bass-boosting EQ is enabled on the iPod, such as "Bass Boost", "Hip-Hop", or "Rock". This is an internal flaw of the iPod and will occur no matter which headphones, speakers, etc are connected to the affected iPod (although, it will be more obvious with some headphones than with others). Try disabling the EQ and see if the distortion goes away.2. Although these Sure amps list a range of voltages that they can be powered from, you will only get the full rated power output when using a supply with the maximum voltage in that range. Power supplies with voltages near the low end (such as a 12V supply) will put out significantly less power than the specs state, and thus there will be lots of clipping distortion at fairly low volumes.3. Even if you are using a power supply with the maximum-rated voltage for the Sure amp, you will still get a lot of distortion at the highest volumes. At maximum power output these Sure amps (like pretty much all class D or T amps) have 10% distortion, which will sound quite bad.Also, try using a few different audio sources, to see if the amp/speaker setup distorts with those other sources as well. If it does, then the distortion is most definitely a result of either the amp or the speakers, so using this Velleman volume controller to boost the signal won't do any good.
Date published: 2011-11-18