![]() through a filtered power supply board, it needs more like 36V though. I've seen some mono power amp designs based on the LM3886 chips in the 60W range. i would love to get my hands on that schematic, but i can't track it down. because the 44 magnum pedal by ehx can put out 44 watts. so it has to be true, right?Ī 9V power supply is apparently possible. my understanding of this is that when ran full tilt, the FETs begin to clip the signal into square waves and that causes the harsh solid state breakup. where all hell breaks loose and things get ugly. pretty much every solid state amp i've ever owned (admittedly all budget models) are clean and focused until the last 10% or so on the volume knob. When i say "farting FETs", i'm talking about the nasty solid state clipping you get at the outer reaches of a solid state amp design. If you are trying to make it compact for a pedalboard, try to determine the max wattage you require and get a chip with that output, otherwise you'll just be burning off the excess power as heat into a big heatsink. The size of the heatsink will not be insignificant for some implementations. If you go with a high watt chip, you need to pay close attention to the heatsink requirements. ![]() Some other popular chips are the TDA20XX series. If you go with a hi-fi amp, make sure the amp has a proper input design for a guitar pedal. The chips are mono so you might want to search around for a mono kit implementation of those. Running two ROG preamps parallel into a stereo amp might be interesting. There are some popular hi-fi stereo kits based on the LM1875 (~30W), LM3875 (~50W) and LM3886 (~70W) chips, but the kits I've seen have the PCBs designed for stereo output rather than mono. You just need to search out a chip that suits your requirements. Most of the amp chips have sample circuits and PCB layouts in their datasheets that you can use to build an amp. This will be much simpler than going into the higher wattage amps. It puts out around 20W, runs off an external laptop power supply and is small enough for a pedal board. There is a kit called the tiny giant that may be of interest if you're leaning more towards a kit. You'll likely be building a power supply for this project. Most of the chips in that wattage range will require a bipolar power supply. For that kind of power output, you're probably going to need a power supply of around 50V for the low end of your wattage requirement. There is no way you're going to get 30-60 watts from a 9V pedal power supply. If you have "farting FETs", the problem is your preamp pedal, not the power amp. A SS power amp will be completely clean and just amplifying what goes into it. The wattage output of the amp has nothing to do with the performance of the JFETs in the preamp. just something i can toss inside a chassis with a ROG amp simulator and a speaker and play around with. but i'm having a hell of a time finding a good solid state kit for cheap. basically i'd like to combine some of the pedals i've built into a super light weight combo setup. ![]() and keep speaker selections open since i'll be using a single speaker. 30-60 watts would be loud enough to avoid farting FETs. and use one of the ROG pedals as a preamp. i'd like to use it to power a single speaker. anybody know a good link for a clean, un-colored solid state amp kit in the 30-60 watt range? i'm looking for a kit. but are intended for running into a clean solid state amp. some of their pedals are surprisingly lively. I'm really getting into the amp-in-a-box builds over at. thought maybe you guys would have some insight. I posted this over in the amp central station.
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