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I finally picked up a couple of these (now $8.) eBay amps. Powered it up from a 12v battery and fed it via an iFi iTube preamp, it sounds pretty great. So I decided to pick up one of the Folsom amps, should be an excellent cool running backup to my Bottlehead, the extra power doesn't hurt either. Anxious to give the Folsom amp a try.Does anyone know what the input impedance is for these little amps?Best,Ed
Yes a BOM (bill of materials) is available. Parts price depends, just the amp board it's about $35 worth of parts including a heatsink. The Antipole parts are about $42. The transformer I recommend can be had for $26/35 (depending on what's available). So far I've found it doesn't really take instructions. The board is well labeled with very few parts. But I have a few notes like making sure the large transistor has long enough legs to get the heatsink on (best to put on heatsink and then solder it in last). Also the output for speakers doesn't have a "ground" because it's balanced, so no forms of ground can make contact with them. Thermal paste is recommended for the chip to heatsink. And most important is not to connect the amplifier while the power supply has any power in it's capacitors. All of that makes it a pretty good first build option for an amplifier. It's also a nice choice because it's hard to screw it up since the chip has many fail safes and is the last line in the parts before your speakers. I'll be taking a few more photos when the boards are printed up, to illustrate the few things you need to know.
Does the BOM just state part values or actual part numbers from Digi-Key and Mouser? Actual PN's would really make life easier. Also, when do you expect the boards will be available, assuming you reach your goal.
I've been checking out this interesting thread, but am unable to find many details about this amp. This would be my first project of this type and the indiegogo page does not contain much info for a newbie such as myself. What additional parts would I need to order for the DIY7297 and the Antipole PSU? Would this work as a headphone amp? What type of connections, input/output? So many questions...
It seems that there's a lot of newbies to amp building that are interested. That's good . It's a bit different than over on the DIYaudio website because half those guys are like gimmie a PCB, I'll figure it out! When the boards are released I'll make a thread just for showing some pictures, and answering some questions as well.
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